Edelbrock Carb Stumbles On Acceleration


350 runs great at idle but bogs down during acceleration. hesitation on a 350. Don't have a timing light handy, so I just advanced the timing about a 1/8-1/4 inch distributor turn. If it doesn’t, the linkage needs to be adjusted. Carburetor Hesitation Problems. Max rpm is 3700, it runs out decent but stumbles and hesitates on. 490 exhaust lift, with 1. When I turn the motor off and restart within 10 minutes, it won't idle, constantly dying. I've been running one of the new street demon 750's on my 402 this year and love the carb. Section two is a parts diagram of Carter/Edelbrock 4 -barrel carbs. I have an edelbrock 1406 series electric choke, 600 cfm carb on my sbc350 and I have always had hesitation issues with it if you accelerate hard. Revving it up via throttle on carb or by peddle with no problems. I've had it since it had. Change ignition, change to a top loader manual, try out single -vse- twin systems, etc etc for the next 4 years. i adjusted timing. While sitting in neutral I can go WOT and it starts to stumble just past 3300 RPM. I rebuilt the carb, new plugs, wires, coil, condenser. 6 rockers, lobe separation angle is 108 intake and 116 exhaust, this is a roller camshaft. Pretty much got the carb dialed in, with the limited slip 3. acceleration hesitation!!! - Dodge Dakota Forum. This unit is re-manufactured by National Carburetors, not Edelbrock. Change the rods and springs very …. Vacuum was around 13-14. Discussion Starter · #1 · Jul 8, 2016. Stock and aftermarket carbs. Idle speed screw, ½ turn clockwise from engagement point. The yellow pump cam is a separate part number (20-81) intended for Dominator carburetors. The vehicle may even stumble entirely during these seconds. 65fastback2+2. Low cruise su. 11-13-2018, 01:10 PM. Las Vegas, NV. At normal cruising no backfiring. I contacted holley and they said it might be the accelerator pump, but it looks to be working properly. Revving it up via throttle on carb or by peddle with no problems. Feb 07, 2008 · Three simple steps. Any Ideas? Thanks,. Mar 07, 2016 · I've looked around for information about off Idle stumble or spit through the carb on the forum, there are a few that come close to what I'm experiencing, but not quite. if i apply moderate throttle it doesnt do it. Also the floats in the carb were moving freely. its only off idle if i hit the throttle hard. Carburetor Hesitation Upon Acceleration. 10-22-2011, 06:58 PM. Each of the four. Today I would like to focus on the Edelbrock Performer 1406 with electric choke. I have a huge lean bog at WOT. It is a 289 with 9. If I advance the distributor it takes care of it but then it diesels. It is a good practice to keep the filter away from heat and not allow it to come in contact with any part of the engine. I'm trying to keep the cost down ias much as possible. Also the floats in the …. A brand new carb from Edelbrock or Holley only comes with a 6 month warranty and is over $400!!! Mine is 2 years and comes with installation and setup on your vehicle!!! Hot Rod, Drag Racing, Classic, Antique, Car, Truck and Farm Tractors, carburetor rebuilding. seem to disapper under hard acceleration (maybe 3/4 thorrtle) but it. thanks for the help been on an 8 week assignment and have just been able to tinker again. One of the most common problems that customers complain about is the spit-cough-pop from the carburetor as a Harley goes from idle to ¼ throttle. I have a 1978 302 in a 1926 model T. Carburetor Sources. Carb is too lean, Common problem with Edelbrock. As engine load increases and the throttle opens wider, intake vacuum drops. Hello! My '59 Apache has a 1970 350/300hp in it, a stock 4bbl intake manifold, and an Edelbrock 1405 1898 4bbl carb on it. Holley 4160 Carb Hesitation. Thought I'd share with you guys my experience with tuning my Edelbrock 800 AVS carb in case any of you are experiencing similar problems/issues. The Edelbrock tuning grid is formed into four quadrants, or squares. thanks for the help been on an 8 week assignment and have just been able to tinker again. eventually it evens out and runs well. (I had others but I will save that for later. Jim, I have the same issue with a 355SBC, Edelbrock dual plane intake and a Holley 670 Street Avenger carb. The AFB (Aluminum Four Barrel) carburetor was produced by Carter for original equipment cars from 1957-1971. Restorations also. 043 accelerator pump nozzle. However, the carburetor can develop problems over time, usually due to a defective gasket or a component which has fallen out of adjustment. The accelerator pump provides a single shot of fuel directly into the venturi, through a dedicated circuit and discharge nozzle, or "squirter," each time the accelerator is pressed. The Shop Area. I called Edelbrock about this a while ago. Always use a filter, such as Edelbrock #8873 between the pump and carburetor. I'm having one problem, a hesitation when opening the secondaries quickly. Consequently, if main jets are enlarged simply to provide a richer mixture for heavy-load/full-throttle use, the not-so-desirable enrichment of cruise air/fuel ratio will also result. Then counter-clockwise until the vacuum comes back up. Oct 21, 2016 · on October 21, 2016. 350 runs great at idle but bogs down during acceleration. However, when I took her for a test run, the backfiring is worse now under rapid acceleration or going uphill under load. Had to go with a Moroso 14" low rise air cleaner, too. I am not certain what you have or the carb history but you might want to look into the low end mixture. At normal cruising no backfiring. Author: Topic: Carb Adjustment, Hesitation on acceleration: Roadkill Journeyman. Float levels are often too high; they should be placed in the middle of the fuel bowl sight glass. 2) The engine runs well at idle and take off in first. 5 Hg pressure on manifold manifold and holding steady at idle. _____ You'll need a vacuum gauge, not a good one, I got mine at Baxter's here in town for $9. Edelbrock carb stumble. AVS2 SERIES ™ CARBURETORS Edelbrock’s next-generation AVS2 Series Carburetors feature annular flow primary boosters with a new calibration for improved off-idle and cruising. As soon as I'm in drive or second and accelerate hard it will stumble. Another thing you'll find is your AFB has a 4 1/4" air cleaner base and the Edelbrock has a 5 1/8" diameter. i just put a edelbrock 600 cfm on my 350 small block and it stumbles off idle. (3) The check valve prevents the fuel backing up through the fuel pump. I got the Edelbrock due to its out of box and run setup. Car has a stock 283 CID V8 engine with a Rochester 4-bbl carb. I've had it since it had. I'm still running this carb today. I have had my cougar running great for awhile now and all of a sudden it will stumble on me when i accelerate hard. Edelbrock Accelerator Pump Assemblies When doing a rebuild on your Edelbrock carburetor, don't forget to replace your accelerator pump with one of these top quality replacement pump assemblies. any suggestions?. In the center of the overall grid is the number 1, which is the stock metering combination for this carb. The following manual consists of 2 sections; Theory of Operation and tuning Procedure. With the timing set, now you can see if the acceleration hesitation is still present. Steady state at any speed fine. Typical symptoms of a lean mixture are: Backfiring as the throttle is closed (primarily during coast-downs) Lurching acceleration. It says "Designed for 402 c. All the other Edelbrock carbs have 5 metering rod springs. A hesitation, stumble or misfire that occurs when the engine is under load can be caused by a faulty power valve inside the carburetor. Learn more. 11-13-2018, 01:10 PM. It is a 289 with 9. The metering rod settings for them make them lean. Another possibility is the metering rod springs. I have a 1978 302 in a 1926 model T. Aug 08, 2021 · The car bucks/kicks/stumbles at about 3100 RPM under hard acceleration. 350 runs great at idle but bogs down during acceleration. Check Engine Light MIL. the issue i am having is i have a 1968 charger with a 383 engine stroked to 500 cu in. Solid lifter cam nothing crazy Holley street dominator intake, 850 Holley carb, stock exhaust manifolds with 3:91 gears. I decided to run it with the valve covers off and I noticed two things on the passenger side. It is a brand new carburetor model (kit part 3117) and while some of the negative may be due to it being a new product, the design is not different from Edelbrock. Note that a good filter is large in area, so it may be able to transmit a significant amount of heat to the fuel. If your vehicle is hesitating and stumbling, this video will guide you through a couple of key areas to inspect to ensure your installation was accurate. Another thing you'll find is your AFB has a 4 1/4" air cleaner base and the Edelbrock has a 5 1/8" diameter. Dude, I had this. I've got a '77 OMC 235 HP (Ford 351) with an Edlebrock 1409 carb that is stumbling just off of idle. The 390 Holley seems to be set up best for the 300 out of the box. This prevent hesitation during acceleration. I repeated that with the other screw as well. Here's what I know so far. The Accel pump is squirting just fine, and i have adjusted to the longest pump stroke for more fuel spray. If your car or truck is equipped with a Holley four barrel carburetor and stumbles upon acceleration, more than likely the carburetor needs an adjustment to the accelerator pump assembly. First, locate the idle mixture screw. Feb 07, 2008 · Three simple steps. I have the same problem as Jerry. I can get 20" hg at idle, steady gauge with no fluctuation. Holley 1908 Carburetor Rebuild Manual Holley 1920, 1940, 1945, 2210, 2245, 5200, 5210, 5300 Carburetor Manual Holley 1940 Carburetor Manual Jun 26, 2012 · As rule of thumb, set your fuel pressure to these ranges based on the carburetor brand: 5-7 psi for Holley, Quick Fuel, AED, Willy's, or Summit Racing; or 4-5 psi for Edelbrock or Jet. See details. Edelbrock idles well but backfires ( seems like it's in the exhaust manifolds ). The car has a very mild 351C 2V with and Edlebrock Performer, and a 700 Holley double pumper carb. I have had my Edelbrock carburetor for about 3 weeks now and the best way I can describe my experience would be "The Good, The Bad and The Ugly". The carb I am using is a NOS Holley 9834-1 Here is what happens: Car starts fine hot or cold. Backfires occur in engines with severe malfunctions, such as those with diverter valve. Edelbrock 600 CFM carb, #1405. To start I set my idle speed at about 700rpm and turned one of the idle mixture screws in until the engine stumbled and then I turned it back 3/4 of a turn. Brisk to "nail it" acceleration fine. Las Vegas, NV. 3 just rebuilt engine and installed a1409 edelbrock carb. In Carter, Edelbrock, and any other carburetor equipped with metering rods, all fuel flows through the main jets (except for idle circuit fuel). That is because engines under a load like a richer mixture than engines at cruise. 8 comp, edelbrock performer rpm heads (1. A carb running rich, as well as a carb running lean, can cause an off-idle stumble or hesitation upon acceleration. This is the reason why a properly functioning quadrajet (not many of those) have great throttle response and cruise MPG's, while still being able to supply air at WOT. The hardest part of fixing a problem with an Edelbrock carburetor usually. setting to help mpg but got a hesitation till fully warm but still felt sluggish so I went back to jets and needles recommended by Edelbrock. Today I would like to focus on the Edelbrock Performer 1406 with electric choke. I asked the tech about the F/A screws being backed all the way out and he said that's not normal so I'm wondering if the carb missed final testing before being shipped to Summit. I had a good buddy with a '67 Coronet R/T that was a so-so performer, he sent the AFB to this guy and after he re-installed the newly re-worked carb I goa ride again and the car just flew. While the Edelbrock carb is overall a great carb, the problem with our early birds is that the stock ( oh so beautiful) air cleaner will not fit with the Edelbrock carb. **edit** and Tranny is 4L80e**. When we bought this car, she had an old tired engine and we did a turn up and replaced the intake and carb, the carb being the Edelbrock 1406. I also, have 92&up 4. By adjusting the idle speed screw on the car as the RPMs initially start to go. 10-19-2016, 04:16 PM. Ever since I got my 1406 carb installed, its had a …. Jul 02, 2013 · Edelbrock/Carter's seem to work well at first, and then lose their tunes due to casting issues. Bottom the idle mixture screw, but don't force it or you may break something. Edelbrock Accelerator Pump Assemblies When doing a rebuild on your Edelbrock carburetor, don't forget to replace your accelerator pump with one of these top quality replacement pump assemblies. The Engine Shop. 1972 Lincoln Mark IV, 460 with Edelbrock 750. Your jetting and rods are what is stock according to the manual. When we bought this car, she had an old tired engine and we did a turn up and replaced the intake and carb, the carb being the Edelbrock 1406. An engine that stumbles, hesitates or bogs when the throttle opens usually needs more fuel from the accelerator pump, or the carburetor is way too large for the engine. This is the Edelbrock carburetor, and those two screws on the front are the mixture screws. It idles great in driveway. 11-13-2018, 01:10 PM. ) On hard acceleration I get a hesitation or sometimes the engine bogs down and won't accelerate at all unless I ease into the throttle. When I got it home I changed the plugs, fuel filters, and inspected the distributor and the points. The Carter-designed AFB and AVS carburetors sold by Edelbrock, and the non-boost-referenced Holley-style carburetors can work well on a low-boost-pressure/mild blown engine. Throttle position is listed across the bottom (X-axis), while the pump cam lift is listed on the vertical (Y-axis). I know how to adjust the springs/rods/jets and such, I'm just trying to determine whether to go leaner or richer. 3 just rebuilt engine and installed a1409 edelbrock carb. i adjusted timing. com) There's 3 clues to your problem: it's too big for your. If the engine is flat or will not accelerate, decrease the main jet by. It also had a stumble when accelerating when the car was already at speed. The carb I am using is a NOS Holley 9834-1 Here is what happens: Car starts fine hot or cold. To test the main jet, do a roll-on from 50-mph to 70-mph in 3rd gear. hesitating on light acceleration from idle. Three simple steps. The car would stumble as soon as the throttle was cracked open from idle. Edelbrock Accelerator Pump Assemblies When doing a rebuild on your Edelbrock carburetor, don't forget to replace your accelerator pump with one of these top quality replacement pump assemblies. Vacuum checked and at 18 and steady at idle. Your carburetor was calibrated using Edelbrock Performer, Performer RPM, and Torker II Power Packages. – carb charts recommend 760 cfm. If i'm in nuetral or park i can rev it up or accelerate hard and it won't do anything. Vacuum checked and at 18 and steady at idle. It just opens without much regard to how cold it really is, and if you get it where it works in the coldest weather, the lack of a pull off can flood it. S ection three is a step -by -step guide to rebuilding your carburetor. Hello! My '59 Apache has a 1970 350/300hp in it, a stock 4bbl intake manifold, and an Edelbrock 1405 1898 4bbl carb on it. Briggs & Stratton Racing Carburetor Tips and Reference Guide. One calibration 1968 289 (C8ZF-G) does have some several engineering problems which we do correct (hesitation, flat spots and surging on acceleration). Any Ideas? Thanks,. Today I would like to focus on the Edelbrock Performer 1406 with electric choke. The car would stumble as soon as the throttle was cracked open from idle. the issue i am having is i have a 1968 charger with a 383 engine stroked to 500 cu in. This is an option if you have a carb that is below 750 CFMs. AVS2 SERIES ™ CARBURETORS Edelbrock’s next-generation AVS2 Series Carburetors feature annular flow primary boosters with a new calibration for improved off-idle and cruising. Accelerator adjustment screw, two turns counter-clockwise from. I repeated that with the other screw as well. If none of that works try the pink springs. My car just started missing and stumbling on light acceleration between 1500-2000 rpm's on my 400 small block. This paragraph also …. Tried bigger jetting and gets worse. Go back to the middle hole on your accelerator pump, lose the weight or spring under the nozzle and drill out or replace the nozzles to something over. 04-20-2010, 08:42 AM. 3 just rebuilt engine and installed a1409 edelbrock carb. The Edelbrock bolt pattern is for a squarebore carb but indeed the primaries are smaller than the secondaries. its only off idle if i hit the throttle hard. I'm trying to keep the cost down ias much as possible. It had a dead spot when i would accelerate and it would not stay running at a intersection and would not idle in the morn. Hello, I have kit #35770 installed on a 383 Stroker engine. 351m,hesitation - posted in 73-79 Ford Truck: Need some help. it stumbles then picks up the load. I have an Edelbrock 600 cfm carb. Save on Edelbrock Carburetor Accelerator Pump #1470 for Performer and Thunder Series AVS 1470 at Advance Auto Parts. I am trying to tune out a hesitation in the off idle part throttle range. I've tightened the air valve spring almost a full turn past what Holley recommends and hasn't made a difference. Any Ideas? Thanks,. I called Edelbrock about this a while ago. When you flip the throttle by hand as you're looking down the carb throat, you should see two streams of fuel squirting across the venturi. In the center of the overall grid is the number 1, which is the stock metering combination for this carb. Accelerator adjustment screw, two turns counter-clockwise from. First, turn the screws out two full turns from bottom. Not that you can't use the rear like the AFB, but the front mount solves some problems with burning crankcase fumes. It only happens when it's warm. The holley carb has many diffrent upgrades you said you changed th nozzle from 25 to 31 that is a huge jump. 10-22-2011, 06:58 PM. The 1405 carb is the performance version of the 600cfm carb. Tried bigger jetting and gets worse. 539" lift, Edelbrock RPM Air-Gap intake, TH350 trans w/ shift kit. Stumble off Idle combustion chamber, eliminated the rich idle condition and removed the stumble off idle. Hesitation on hard acceleration. Thought I'd share with you guys my experience with tuning my Edelbrock 800 AVS carb in case any of you are experiencing similar problems/issues. It runs fine up on moderate to heavy pedal. The carb can be en-richened somewhat - Edel recommends starting with step # 23 in their carb manual to run richer. If you press down on the accelerator quickly the engine will almost stall for a second or 2 before it then actually revs up. When I turn the motor off and restart within 10 minutes, it won't idle, constantly dying. its only off idle if i hit the throttle hard. After working with Edelbrock tech's for over a week they determined it could be a defective carb as no matter what we tried we couldn't get rid of the hesitation. I have a 1978 302 in a 1926 model T. i recently purchased the car and noticed that it has a major hesitation issue when I accelerate. A hesitation needs to be tuned with the Transition Circuit of the carburetor, and it is actually pretty easy to do. I have a 383 stroker, 9. It seemed to me that on the manifold vacuum port of the. Discussion Starter · #1 · Jan 30, 2016. So I've been a fan of the Carter AFB Edelbrock carb on my street cars for many years. I found that the accelerator pump was. Seller assumes all responsibility for this listing. The initial float setting when the carburetor is being assembled at the Demon factory (the dry setting) is accomplished by removing the fuel bowl and, with it turned upside-down, the dimension between the inside top of the bowl and the top of the float is set at approximately 0. See the picture below. Check your vehicle repair manual for a better understanding and diagnosis of the accelerator pump in your particular vehicle model. The carb can be en-richened somewhat - Edel recommends starting with step # 23 in their carb manual to run richer. 02 heads, mild comp cam 224/ 230 @. The reason I set up. Las Vegas, NV. I have an edelbrock 1406 series electric choke, 600 cfm carb on my sbc350 and I have always had hesitation issues with it if you accelerate hard. I recently put the Terminator setup on my small block, and I'm having some growing pains with getting it happy throughout all ranges. Currently have an 800 cfm performer on the 401 in the Javelin. It says "Designed for 402 c. #674290 - 04/20/09 02:42 AM Re: carb bogs and back fires under full throttle [ Re: SinCitySid ] Joined: Jul 2007. Its a Edelbrock 1406 model. Btw, its an edelbrock performer intake and edelbrock 1406 carb adjusted with vacuum gauge. A hesitation or lag may result during this transition and influx of air. However, when accelerating in 2nd and 3rd, there is a hesitation during the acceleration. By adjusting the idle speed screw on the car as the RPMs initially start to go. Stock and aftermarket carbs. I have a sticky 150/60/17 Michelin Pilot Power 2CT street tire with 14/40 gearing and I can beat my friends on their 600cc sportbikes off the line and also in the corners. I would think the engine is out of time or the spark plug wires are not installed correctly. The Edelbrock 1411 has mechanical secondaries and a single pump. 75"headers Timing: 13deg at idle, 34deg max Did a few tests and it looks like the carb is way too small. If your car or truck is equipped with a Holley four barrel carburetor and stumbles upon acceleration, more than likely the carburetor needs an adjustment to the accelerator pump assembly. The proper way to tune mixture screws are to turn them in until the engine stumbles and then start backing them ½ turn at a time until the engine reaches best lean idle. 305 heads (I think they are only off 2cc from stock) and 204° / 214°. 11-13-2018, 01:10 PM. drive your car and when it start the stumbling when you give it gas, immediately turn the engine off and pull over (put it in neutral if need be). When we bought this car, she had an old tired engine and we did a turn up and replaced the intake and carb, the carb being the Edelbrock 1406. She purrs and has good throttle response all the way to WOT with no issues, in park. Author: Topic: Carb Adjustment, Hesitation on acceleration: Roadkill Journeyman. DansEdgli · Chasing 500rwkw. REMANUFACTURED EDELBROCK CARBURETOR. Edelbrock 600 CFM carb, #1405. 1980 Coupe / Snowcrest White / L48, 350 / Comp Cam / Edelbrock Heads / Cyclone Intake / Holley Carb / Holley Fuel Pump / Patriot Headers / Dual Exhaust / Magnaflow Mufflers / 1964 Coupe / Riverside Red / L76, 327, 365hp Joined: 8/17/2010 Posts: 173. Accelerator pump problem Edelbrock 1405 1898. The 2100 carburetor was first introduced in 1957 and remained in production, as the 2150, until the 1980s. A carb running rich, as well as a carb running lean, can cause an off-idle stumble or hesitation upon acceleration. The lightweight all-aluminum body features a two-piece body that resists warping and is compatible with gasohol and blended fuels. I converted the points to a Pertronix II anyway. 490 exhaust lift, with 1. The fuel pressure must stay above 5 psi at wide-open throttle; if not, the carburetor will starve for fuel. reset and adjusted chock working ok ( i think) still had. This problem first surfaced about 2014. They click well with manual transmission. The proper way to tune mixture screws are to turn them in until the engine stumbles and then start backing them ½ turn at a time until the engine reaches best lean idle. it idles at 14lbs of vac. I have a 1978 302 in a 1926 model T. Its like give it a bit of gas and get a "wa- wa- waaaaah" surge or stutter, not really a hesitation though. i also adjusted the accel pump. Hello! My '59 Apache has a 1970 350/300hp in it, a stock 4bbl intake manifold, and an Edelbrock 1405 1898 4bbl carb on it. Above 75° it starts to run rough, stumbles, no acceleration. 4 that I suspect was a shadetree job. A hesitation needs to be tuned with the Transition Circuit of the carburetor, and it is actually pretty easy to do. Still unable to remedy an off idle stumble. 1; 2; Next. ok ive gone through everything i can think of. 5:1 comp, Edelbrock Etec 170 heads, 234/238 @. The car has a very mild 351C 2V with and Edlebrock Performer, and a 700 Holley double pumper carb. I am having a the issue of throttle hesitation on my newly rebuilt 1964 283, the carb is a Rochester 2gv, I thoroughly cleaned it and installed a rebuilt kit and to the best of my knowledge installed all components and made all suggested adjustments correctly. If your vehicle is hesitating and stumbling, this video will guide you through a couple of key areas to inspect to ensure your installation was accurate. This is especially true when running any kind of performance cam resulting in lower vacuum. Still has a slight hesitation. However, when I took her for a test run, the backfiring is worse now under rapid acceleration or going uphill under load. and i can hit the throttle at any other speed and its fine. I called the carb place that rebuilt it and they said it must be an electrical or iginition problem as …. Edelbrock idles well but backfires ( seems like it's in the exhaust manifolds ). I pulled the valve covers. The fuel pressure must stay above 5 psi at wide-open throttle; if not, the carburetor will starve for fuel. 04-20-2010, 08:42 AM. I'm getting 20. the engine stumble when turned all the way in the idle jet is too large. The carb I am using is a NOS Holley 9834-1 Here is what happens: Car starts fine hot or cold. 2) The engine runs well at idle and take off in first. 1 of 2 Go to page. Got it out on the lake today and it's pretty doggy. i adjusted timing. I have found that to be the best way to set the mixture and it corrected a lot of hesitation on my carb. If you're going to be running aftermarket headers, E85, custom tune, etc. Learn more. The performer rpm was too tall and wouldn't fit under the hood. I use an adapter I made and an Edelbrock syncro tool to equalize the air flow to each carb at idle and once the linkage (positive 1:1) is set use only one idle stop screw to set curb idle with the other one removed. accelerate hard (3/4 throttle) I either get a carb backfire or popping in the exhaust. When I got the truck, it was very hard to start and it stumbled when I accelerated. I have an edelbrock performer intake and 600 cfm performer carb. Jun 24, 2010 #6. Hi guys I am new here. To start I set my idle speed at about 700rpm and turned one of the idle mixture screws in until the engine stumbled and then I turned it back 3/4 of a turn. Change the rods and springs very …. Too far out and it starts running funky. I could not find any excessive play in rocker arms or push rods. The engine is a 1978 360 cu in that has less than 30,000 miles on it since being completely rebuilt. 098--big difference. Instead, you can use Edelbrock part number 1468 which has a stronger spring. However, there is a long list of other reasons which could be the cause of this hesitation problem too. Make sure the ignition is good before you start changing stuff though. 1 Color Line it has a "TU1/K" engine with a single Solex carburetor (Solex 32 PBISA 12) the car was purchased new in italy in 1991 but it was actually imported from france by the dealer. It just opens without much regard to how cold it really is, and if you get it where it works in the coldest weather, the lack of a pull off can flood it. I also have an automatic transmission -- a cruise-o-matic which was rebuilt at some point in time, but shifts pretty firm and handles well. I used to run the Edelbrock 1406 600cfm on the 350 that used to be in the car and I could never get it to run right either and I bought this carb new as well. We have a 93 Evinrude 30HP that starts and In this clip I hit the throttle to WOT and leave it there. '68 - 302 new Edelbrock 650 CFM carb on a stock intake. You will get better results using the 1405 settings. As engine load increases and the throttle opens wider, intake vacuum drops. Another possibility is the metering rod springs. 024, one 0. Edelbrock 600 CFM carb, #1405. 7, steady state cruise a little rich out of the box. 2) The engine runs well at idle and take off in first. 0 head - with rollor rockers, clifford intake and edelbrock 4 brl carb(650 cfm - part #1826), zero clearanced the deck of block to pistons. Runs really well, except the transition from idle to throttle when car is under load it stumbles. I've followed the tuning procedures listed in the carb manual and just can't get this stumble cleared up, it happens ~ 900-1,200 RPM and runs fine everywhere else. The car starts, idles and runs ok under gentle acceleration. I would think the engine is out of time or the spark plug wires are not installed correctly. #674290 - 04/20/09 02:42 AM Re: carb bogs and back fires under full throttle [ Re: SinCitySid ] Joined: Jul 2007. The 1406 carb is an emissions type carb. When a carburetor is running lean, the fuel-to-air ratio is off because the carburetor is delivering too much air. Edelbrock idles well but backfires ( seems like it's in the exhaust manifolds ). 1974 Dodge Dart Accelerator hesitation. I finished by pluging the vacumm gauge on the ported vacuum port of the carb to check the vacuum : 0 @ idle peaked about 22/23 on quick acceleration and back to 0. Buy online, pick up in-store in 30 minutes. Plus we also carry a full line of Holley and Edelbrock Performance Carburetors. Vacuum was around 13-14. Section two is a parts diagram of Carter/Edelbrock 4 -barrel carbs. Q: I can't get the "Bog" out of my mechanical secondary carburetor what's wrong and how can I fix it? The sole purpose of the accelerator pump system is to provide a combustible air/fuel ratio during hard acceleration, especially from idle, for the time it takes the main metering system, via the booster venturi, to respond to the increase in air velocity. Backfires through exhaust and sometimes out carb with white smoke. Jim, I have the same issue with a 355SBC, Edelbrock dual plane intake and a Holley 670 Street Avenger carb. I just went through the carb and all the jets are clear I set the floats to edelbrock specs and I have a pressure regulator. It features annular-flow primary boosters with calibration for improved off-idle and cruising, which also delivers improved fuel atomization, eliminating flat spots during idle. However, the carburetor can develop problems over time, usually due to a defective gasket or a component which has fallen out of adjustment. One lifter doesn't move at all and another barely moves. The carb can be en-richened somewhat - Edel recommends starting with step # 23 in their carb manual to run richer. The Step-up springs are in the carb under the Step-up Pistons. The following manual consists of 2 sections; Theory of Operation and tuning Procedure. 351m,hesitation - posted in 73-79 Ford Truck: Need some help. Jun 24, 2010 #6. It's too high. The car has a very mild 351C 2V with and Edlebrock Performer, and a 700 Holley double pumper carb. Back in the 80's there was a Carter carb guru that could make the AFB fly. First increased Accelerator pump to max. Edelbrock Dont do this !. The car runs strong but has developed a secondary stumble with the 850. The carb has the same metering rods it came with in the package. its only off idle if i hit the throttle hard. Occasionally, the carburetor's idle jet will become clogged with dirt, which will cause the hesitation or stall. One calibration 1968 289 (C8ZF-G) does have some several engineering problems which we do correct (hesitation, flat spots and surging on acceleration). So I've been a fan of the Carter AFB Edelbrock carb on my street cars for many years. if i apply moderate throttle it doesnt do it. The stock accelerator pump for carburetors less than 750 CFMS is Edelbrock part number 1470. All the other Edelbrock carbs have 5 metering rod springs. The 390 Holley seems to be set up best for the 300 out of the box. I finished by pluging the vacumm gauge on the ported vacuum port of the carb to check the vacuum : 0 @ idle peaked about 22/23 on quick acceleration and back to 0. Mine was …. Prior to that had the Carter which i simply couldn't get tuned properly. Define hesitation, Are you taking about a stumble …. This prevent hesitation during acceleration. Carb is too lean, Common problem with Edelbrock. Change ignition, change to a top loader manual, try out single -vse- twin systems, etc etc for the next 4 years. If it doesn’t, the linkage needs to be adjusted. I have recently rebuilt my demon 850 CFM carb, Everything seems to be working fine except for the fact that regardless of whether it's hot or cold when I First press the gas pedal the car hesitates stumbles and nearly stalls. 1972 Lincoln Mark IV, 460 with Edelbrock 750. However, the carburetor can develop problems over time, usually due to a defective gasket or a component which has fallen out of adjustment. Ran an old Motorcraft VV two barrel for a while. With the Edelbrock AVS2 carb in place, the TPS reported that it only required between 12 and 13 percent throttle opening to produce the same light acceleration away from a stop light. thanks for the help been on an 8 week assignment and have just been able to tinker again. Is this the carb thats on my 289(its stock)??? whats the cfm rating? AUTOLITE 4100 This is the finest four-barrel carburetor that has yet to be made by anybody. I've been having a bog from idle on WOT with my Edlebrock 600CFM 1406 carb every since I installed an Air Gap intake. I've tightened the air valve spring almost a full turn past what Holley recommends and hasn't made a difference. Changed the primary squirters to a #43, nothing, bent the pump rod, still there. as soon as you put it under load it pukes and dies. setting to help mpg but got a hesitation till fully warm but still felt sluggish so I went back to jets and needles recommended by Edelbrock. Part throttle response is great and crisp. May not be the problem but easy to tweak and. I tried changing jets, spring, rods, timing, moving the accelerator pump arm, etc. Learn more. Feb 07, 2008 · Three simple steps. 098--big difference. The only difference is that the 500 cfm carb has fatter booster rings to restrict the air floww 100 cfm and leaner jetting. Do a google search with your carb manufacturer and you should find some tuning information. 73,000 MILES. Save on Edelbrock Carburetor Accelerator Pump #1470 for Performer and Thunder Series AVS 1470 at Advance Auto Parts. 9 V6, 5 speed, 4x4 that is getting older (sigh), with just over 100,000 on the odometer. The Carter-designed AFB and AVS carburetors sold by Edelbrock, and the non-boost-referenced Holley-style carburetors can work well on a low-boost-pressure/mild blown engine. I know how to adjust the springs/rods/jets and such, I'm just trying to determine whether to go leaner or richer. Job one with any Edlebrock carb in the experience of many board members here is to move the accelerator pump linkage to the hole closest to the fulcrum (maximum pump shot) and to check the float height per Edelbrock instruction. Edelbrock carb stumble. Carburetor Hesitation Problems. then re-assemble the unit with a Edelbrock rebuilding kit. It is a brand new carburetor model (kit part 3117) and while some of the negative may be due to it being a new product, the design is not different from Edelbrock. thanks for the help been on an 8 week assignment and have just been able to tinker again. I have an edelbrock performer intake and 600 cfm performer carb. Also after sudden acceleration it backfires more often than not. This is the Edelbrock carburetor, and those two screws on the front are the mixture screws. 4 hours ago · Edelbrock carb stumbles under load. Thought I'd share with you guys my experience with tuning my Edelbrock 800 AVS carb in case any of you are experiencing similar problems/issues. First increased Accelerator pump to max. Every time you press the accelerator even slightly it stumbles and then catches up. While this is hardly a true scientific test, it does illustrate the subjective response that we felt with the carburetor. Occasionally, the carburetor's idle jet will become clogged with dirt, which will cause the hesitation or stall. Another possibility is the metering rod springs. Tuning with wideband. How much is. seem to disapper under hard acceleration (maybe 3/4 thorrtle) but it. Hi I am the lucky owner of an AK built fantastically by A N Other in 2007 and bought by me in January this year. It seemed to me that on the manifold vacuum port of the. I have recently rebuilt my demon 850 CFM carb, Everything seems to be working fine except for the fact that regardless of whether it's hot or cold when I First press the gas pedal the car hesitates stumbles and nearly stalls. This paragraph applies to an instantaneous bog, hesitation, or stumble upon acceleration. As you accelerate and spool up on the speed rather slowly it will finally get there but it bogs down under WOT or heavy acceleration, and after getting up to speed it seems to run fine again. 4 that I suspect was a shadetree job. TYPICAL ENGINE A/F RATIOS FIGURE 1 METERING SYSTEMS The Edelbrock carburetor has three (3) basic systems that meter fuel to the engine: The Idle System, Primary Main System, and Secondary Main System. 30K miles, and it's really never given me much trouble, except for one thing. Go back to the middle hole on your accelerator pump, lose the weight or spring under the nozzle and drill out or replace the nozzles to something over. Since he installed a new one he obtained very recently, he has not been able to get rid of a light to moderate acceleration stumble. i replace the carb with a stock motorcraft 2bbl. Still unable to remedy an off idle stumble. I've been having a bog from idle on WOT with my Edlebrock 600CFM 1406 carb every since I installed an Air Gap intake. its only off idle if i hit the throttle hard. i have a question about a 1813 thunder series avs carb i purchased in 2007. You will get better results using the 1405 settings. Note that a good filter is large in area, so it may be able to transmit a significant amount of heat to the fuel. I have a 1966 Corvette 327 with a 4 barrel carb. The Engine Shop. i adjusted the idle mixture screws and it didnt help. installed edelbrock 1406. Mine was …. I have a slightly warmed 260 V8 in my 64 Ranchero. See the picture below. When cold the engine stumbles upon acceleration and bucks when in 1st gear. I used to run the Edelbrock 1406 600cfm on the 350 that used to be in the car and I could never get it to run right either and I bought this carb new as well. When you mash the throttle. Another possibility is the metering rod springs. How to Repair Engine Surging. Edelbrock carb stumbles under load. 180xxx on the odo. It also had a stumble when accelerating when the car was already at speed. Backfiring during acceleration occurs when ignition takes place in the intake or exhaust instead of the combustion chamber. It has a rebuilt Autolite 4100 4 barrel carb rated at 480 cfm with 48 primary jets, new accelerator pump, power valve. Discussion Starter · #1 · Jul 8, 2016. I would definitely recommend this carb, and recommend people to think twice before rebuilding 40+ year old carburetors. The problem is as follows: (1) After the engine is switched off, heat from the engine heats the fuel in the fuel line. Runs great when cold and in cooler temps. 442" 112° 107° on the cam with msd 8360 distributor and street fire wires. then re-assemble the unit with a Edelbrock rebuilding kit. The carb for this project will be an Edelbrock Performer 600 CFM Carburetor with a manual choke, part #1405, as installed on a Mopar 318 cid (5. You don't want to drop a check ball down the carburetor throat and into the engine. NOTHING worked. Tried bigger jetting and gets worse. I decided to run it with the valve covers off and I noticed two things on the passenger side. Edelbrock carburetors are carefully tuned at the factory to work with the vast majority of applications. Feb 07, 2008 · Three simple steps. Feels like a "flat spot" from a carb with a too small an accelerator pump. This is a popular carb for the small block Ford and is the trickiest Performer carb to tune. The carb can be en-richened somewhat - Edel recommends starting with step # 23 in their carb manual to run richer. Any Ideas? Thanks,. 000km (like 40k miles) and it's always been serviced I sent the car to a shop to replace a "boot" seal on one axle but since the first few meters after. Hello! My '59 Apache has a 1970 350/300hp in it, a stock 4bbl intake manifold, and an Edelbrock 1405 1898 4bbl carb on it. I've looked around for information about off Idle stumble or spit through the carb on the forum, there are a few that come close to what I'm experiencing, but not quite. Too far out and it starts running funky. I tried changing jets, spring, rods, timing, moving the accelerator pump arm, etc. Change jets, replace needles/seats and adjust floats on any Edelbrock carburetor without having to drain the fuel from the bowls or remove the carb from the manifold. The car runs strong but has developed a secondary stumble with the 850. The Engine Shop. I actually use a small, broken drill bit that's just the right size. thanks for the help been on an 8 week assignment and have just been able to tinker again. 490 exhaust lift, with 1. The right components will help to keep your carb working to it's full potential. The 1405 carb is the performance version of the 600cfm carb. Got it out on the lake today and it's pretty doggy. Photo courtesy of Brian Snelson on Wikimedia. But since the 1406 is the mileage/emissions carb, they sacrificed some drivability by using a 4 spring. New edelbrock carb causes backfires. 1978 INTERNATIONAL SCOUT. 050", 650 edelbrock thunderseries carb, msd 6al ignition, msd pro bil distributor with blaster 2 coil. Only issue is that at very light acceleration there is a hesitation and stumble. I would think the engine is out of time or the spark plug wires are not installed correctly. It is a good practice to keep the filter away from heat and not allow it to come in contact with any part of the engine. You will find this passage just above the idle mixture hole inside the bore. This kit includes one 0. when the carburetor is on the small side. hesitation on acceleration carburetor Episode 480 We need to take our 1964 Falcon to the drag strip to get a base line for future modifications. I had the same problem of off idle hesitation and I swapped the …. The accelerator pump controls response when pressing down on the gas pedal. Plug the gauge on the lower port on the front of the carb, this should NOT have your vacuum advance unit hooked to it. For the typical Edelbrock carburetor, the calibration kit for the model carb you’re. 1; 2; Next. Still no difference. It seemed to me that on the manifold vacuum port of the. edelbrock carb tuning. 32 minutes ago · Evinrude cuts out high rpm. These adjustments will control idle speed, idle quality, and initial responsiveness/ acceleration of the engine. This unit is re-manufactured by National Carburetors, not Edelbrock. Congrats to PI for the fast shipping and to Edelbrock for creating the AVS2. I pulled the valve covers. The engine still stumbles and backfires through the carb. Accelerator pump problem Edelbrock 1405 1898. The Carter-designed AFB and AVS carburetors sold by Edelbrock, and the non-boost-referenced Holley-style carburetors can work well on a low-boost-pressure/mild blown engine. It is usually the result of a problem with the air and fuel mixture within the combustion chamber. (2) The expanding fuel (increased volatility) creates pressure in the fuel line from the pump to the carburetor. From the beginning: Bought this truck drove it home ran ok but seemed to be lacking power but drove ok. I've had it since it had. This can be fixed by doing a rough adjustment. Step 1 - If a check engine warning light has come "ON" while driving, the computer will need to have the trouble codes read to help fix the problem. Edelbrock #1406/#9906. Reasonable pricing. This can occur on any model, any carburetor, but seems to happen most often with the stock CV Keihin carburetors used on the newer (90 up) Big Twins and Sportster models. If this doesn't fix the problem, then you might have to change to a larger accelerator pump nozzle. I've fiddled and fiddled with the accelerator pump (installed new parts adjusted and adjusted) and it still does it. The 4100 was replaced by the 4300 Autolite emissions carburetor in. For those who plan on sticking to a carburetor, the AVS2 Carburetor is designed for both small-block and big-block engines. Mar 07, 2016 · I've looked around for information about off Idle stumble or spit through the carb on the forum, there are a few that come close to what I'm experiencing, but not quite. The Edelbrock 1411 has mechanical secondaries and a single pump. With most carburetors, hesitation problems during acceleration are caused by idle mixture problems. Consult your repair manual, if necessary. 035-inch nozzle. 098 - 600 CFM 4bbl Edelbrock carb and performer manifold - RV cam - pertronix. When a carburetor is running lean, the fuel-to-air ratio is off because the carburetor is delivering too much air. On the edelbrock this is adjustable. Back firing. Don't have a timing light handy, so I just advanced the timing about a 1/8-1/4 inch distributor turn. Since 2004 S&S shorty carbs have been fitted with an adjustable main jet air bleed (#13). its only off idle if i hit the throttle hard. As you accelerate and spool up on the speed rather slowly it will finally get there but it bogs down under WOT or heavy acceleration, and after getting up to speed it seems to run fine again. The reason I set up. Then increased main jets from stock 0. See the picture below. It's on a GMPP ZZ502, M21, 3:07 rear. For the typical Edelbrock carburetor, the calibration kit for the model carb you're. Discussion Starter · #1 · Jul 8, 2016. It seemed to me that on the manifold vacuum port of the. It is usually the result of a problem with the air and fuel mixture within the combustion chamber. Low cruise su. Electric choke works great, after the choke comes off and the car idles at 800 rpm glass smooth. At normal cruising no backfiring. 5 psi and u dont have to have a regulator for it, yes it is a automattic turbo 400 tranny and i do have vacuum secondaries on the carb. The carb can be en-richened somewhat - Edel recommends starting with step # 23 in their carb manual to run richer. Posted by Mike on 12/1/2019 to AFB, Edelbrock, Weber Marine. Jan 22, 2017 · 2006 evinrude enviro 150 horse. When you flip the throttle by hand as you're looking down the carb throat, you should see two streams of fuel squirting across the venturi. Hello, I have kit #35770 installed on a 383 Stroker engine. well first off the setup is 350, bored. Specs: 1970 F250 camper special, 360, C6, RWD, Pertronix (with new plugs, wires, cap, rotor, coil), rebuild with about 35k and hardened valve seats, professionally rebuilt Motorcraft 2150 carb. In the case of my Edelbrock, the engine will not keep running if either of the two idle screws is turned all of the way in - this is normal. It has a rebuilt Autolite 4100 4 barrel carb rated at 480 cfm with 48 primary jets, new accelerator pump, power valve. Currently have an 800 cfm performer on the 401 in the Javelin. 11-13-2018, 01:10 PM. Don't have a timing light handy, so I just advanced the timing about a 1/8-1/4 inch distributor turn. Accelerator adjustment screw, two turns counter-clockwise from. REMANUFACTURED EDELBROCK CARBURETOR. its only off idle if i hit the throttle hard. Let's assume that the carb we are working on is a 600 cfm 0-1850 Holley carburetor. Still won't run when. It features annular-flow primary boosters with calibration for improved off-idle and cruising, which also delivers improved fuel atomization, eliminating flat spots during idle. What I want from a carb is reliabillity, easy adjustment, and the capacity for fuel economy in corelation with my right foot's behavior, since my approx 260hp 350 doesn't need that much. Edelbrock Dont do this !. I have an edelbrock 500cfm manuel choke carb on my long rod slant build up and I am in the process of tuning it now. (I had others but I will save that for later. I have installed the Pro Flo 3 on my '66 Chevelle. If it doesn’t, the linkage needs to be adjusted. I have a slightly warmed 260 V8 in my 64 Ranchero. Cure The Bog And Sluggish Response On Your Holley Four-Barrel Carburetor, By Properly Adjusting The Accelerator Pump Assembly. i adjusted the idle mixture screws and it didnt help. I had a good buddy with a '67 Coronet R/T that was a so-so performer, he sent the AFB to this guy and after he re-installed the newly re-worked carb I goa ride again and the car just flew.