10,5:1 comp. May 14, 2022 · The issue is that the car will crank and fire but then immediately stumble and stall. 8. Jun 4, 2003 · Hi, I just finished installing an edelbrock 600 performer carb (1406) and a performer RPM intake on my otherwise totally stock 1972 350. As this my second american car, the other one being a 1971 Red Camaro with Holley, I have yet to understand the tuning procedure of the Edelbrock carb in full. When it does this, the tablet shows the vacuum going as low as -1. I have a off-idle stumble I am trying to work out. Coil ohms out in spec, but I need to do some more troubleshooting. But that’s not all that a carb requires of its owner. Cap/rotor, plugs, wires are all good. Edelbrock 1906 with electric choke. It seems Apr 4, 2013 · stumble or bog is NOT from too small a carb, usually from to large a carb. moved accelerator pump to rich setting now the truck will take WOT, idle in the driveway as well as idle in Mar 6, 2021 · Ignition stumble missfire shows as Lean on the AFR guage. 1480. Check to see if your old carb had mechanical secondary. 55 gears. moved the dist. You will get better results using the 1405 settings . 2). The lean condition is during transition from cruise to WOT. When i first go trough wizard i get base map 5036, that one was way to rich and i had to change my oil, after that i downloaded base map 5029 witsch is for lower cui engines and it runs great at idle and cruise but when Feb 22, 2024 · EDIT: I am using Edelbrock EDL-1728 EFI fuel pressure regulator. Get the edelbrock tuning Mar 21, 2014 · The only other thing that comes to mind is if you run a large cam like me, and your engine does not have enough vacuum signal to run a vacuum secondary at WOT. I am running a 331 stroker with AFR 1388 heads, Comp Cam XE274HR-12, RPM Air Gap intake with 3/4" spacer and the 1405 Carb. Pulls hard once it recovers. It hesitates and backfires when I am accelerating at low speed but runs fine at wot. 5:1 cruise and 12:1 WOT. Aluheads. May 10, 2008 · My buddy loaned me a edelbrock 750 to try, he had a similar problem and the 750 cured it for him. I have disconnected the choke and wired it open just to see if the choke had anything to do with it. Nov 14, 2010 · - WOT at 2500 and 3000 rpm – A/F leans out to 16 with initial slight hesitation/bog but feel power kick in when A/F drops to 13 and pulls good through 5000 rpm when I let off accelerator. Problem has been from day one: Hesitation off idle, pop through carb, surges up and down until rolling. The a/f jumps from 12. Jun 25, 2020 · Changes to the front metering don't change the rear metering, but they do change the A/F ratio when all four barrels are open. 037 made a big difference for both part throttle snap and WOT snap, both now more of a stumble. Get the WOT full load mixture where it will make best power. If you have a good WOT A/F you want to maintain, when you change the front metering to make cruise leaner you would need to make sure the needle tip size doesn't change or you will also be changing the WOT A/F. Cruise (14. to large and the velocity slows down causing lean condition and poor atomization. If it i Mar 6, 2019 · Edelbrock has developed new parts for their AVS line of carburetors, dubbed AVS2, that drastically improve throttle response. 010" ]. No dice. New edelbrock carb bogs & surges at wot. 3) and WOT (12. Mar 10, 2013 · Ok, my friend and I have been trying for several days to get the stumble out of the carb in his Roadster. I’ll show you how and when to adjust the air valve secondaries (AVS) and one massive mistake everyone seems to make when setting this adjustment. i w/hypertech coil, etc. Then lean Jun 24, 2012 · 1. V8 Discussion Edelbrock Performer 1411 Pdf User Manuals. if its bogging down on WOT you may want to experiment with the secondaries, stiffer pring on vacuum models so it opens slower or different metering rods that step the fuel in Aug 15, 2024 · WOT is insta bog (i think its a rich bog) for about 1 second. Sep 26, 2017 · I had so carefully set the floats to Edelbrock specs I figured it couldn't be that. Sep 7, 2016 · 466 edelbrock rpm heads, airgap spread bore intake with 2" adapter spacer 10. Jump to Latest Oct 14, 2011 · I also upgraded the springs & mounts. Cruises very good. The problem I have is when I punch it! Mar 13, 2021 · There was a real bad WOT lean spot also. I bought a new canister because my original one was bad. Large cams really seem to prefer mechanical secondarys and rear pumps. Calibrating the Jan 6, 2012 · Essentially, when I transition from off the throttle all together, and just slightly tip into throttle, I go from stoich (~14. Nov 12, 2010 · I did the following to get rid of my stumble this fall in addition to the already mentioned mods above- -Added edelbrock blue "Marine" acc pumps (pn 1470) -Drilled another hole even closer to the pivot point than the factory top hole Jan 13, 2017 · I got to know my Edelbrock 1806 650 AVS carb recently, and found a lot of useful, but scattered, information on this site to help me tune the carb. I think I would be better off with the normal tune 800 cfm. These tunin Jun 4, 2021 · The last time we talked about carburetors, we focused on getting the idle mixture and speed in line. 6 exhaust valve,torker intake,headers and a mild cam, 727 with 3000 stall and 3. Automotive Performance Carburetors, Cylinder Heads, Intake Manifolds. If left at 1100, it will continue to stumble along until you accelerate above 1200, then she's smooth. View online or download Edelbrock Performer 1411 Owner's Manual, Installation Instructions (Wot) 12. Jan 8, 2021 · 1964 Impala sbc 283 . I am trying to cure an off idle stumble. 650 lift. Jul 13, 2010 · Used all Edelbrock RPM parts (heads, cam, inlet manifold etc) plus lots of other goodies, so a very nice engine. 5 for the WOT and 14. Having your idle in line doesn’t mean Aug 24, 2006 · I think I may have found the solution to 3 of my problems: engine getting hot, WOT from idle stumble, and low brake booster vacuum. Jun 20, 2005 · ive got an edelbrock 1406 (elec choke 600cfm) on a mildly built 283 (. The engine is a 340 4 speed mildly modified. I have a '16 Edelbrock supercharged mustang GT. 050") and what your starter can handle on hot restarts Dec 7, 2007 · Ive tried adjusting the carb and even bought a new 600cfm edelbrock carb for it and it does the same thing. Vacuum at idle is 10" cruise 15". 8 - 43. My set up is a muncie m20 with a 2. How to properly set your t Apr 3, 2020 · If I launch at 2000rpms, no stumble at all. No problems yet. Its calibrated with the calibration kit 1485 from edelbrock, the problem is when i hit full throttle it stumbles and the secondary upper air valve wont open all the way opens 3/4. Apr 23, 2012 · Don’t piss your money away. 1949 Mercury coupe Nosed, Decked, Frenched 58 T-Bird interior Jan 11, 2016 · The only issue I'm having is a slight stumble only at take off and only happens if the RPM is below 1800. Nov 11, 2023 · After uploading that recent video about WOT off idle bog/stumble, I'm told by alot of other guys that my RPMs are too lowsaid I should be at 650-700 RPM in gear and 900-1000 RPM at idleI did this and pedal response is a bit snappier and it bettered the bog, but didn't cure itno dieseling at shut off. Is this higher fuel pressure my problem? May 15, 2017 · I have an edelbrock 1406 that when i dump the clutch it bogs and stumbles really bad. At WOT, the jetting and air-fuel mixture will be the same. The 1405 (manual choke) is tuned for performance. Don't have a timing light handy, so I just advanced the timing about a 1/8-1/4 inch distributor turn. In the beginning of double pumpers, 40+ years ago, the first versions of the 750 and 800 had the 50 CC pump on the front because it is most important to get the manifold wet when the throttle is first snapped open. May 8, 2020 · We may earn a commission for products purchased through links on this page Oct 15, 2007 · The Techs at Edelbrock recomend increasing the secondary jet up 2 sizes when using a Air Gap Manifold. . Apr 12, 2018 · IDK the specifics of the edelbrock AVS2, but most edelbrock carbs are copies of the carter AFB. 6:1 AFR) to temporarily very rich (~11) and then back to a more normal 12. Stumble and hesitation from above idle to 3000 rpm . 7 area, no higher than 13. The carb rebuild kit I got (non-OEM) came with two sets of needles, one for "offroad" that uses springs to help prevent flooding. There were also several different sizes of 2G/2GC carbs, some of which may be too big for a 327. Engine is a 440 with 1. Why are my fuel modifier settings reverting back to "0". I notice a little moisture around the accelerator pump rod but not a lot. 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. I was able to rid my carb of stumble using plug readings. Any help from the group would be appreciated. Apr 17, 2012 · Im using a 750 mighty demon, Austin. I have checked that the valv slides smoth Feb 21, 2017 · Idle is on the rich side, but WOT is dangerously lean. Every red light was an embarrassment waiting to happen. But I feel like it's running a bit lean when I get on the throttle. 5 at part-throttle cruise. If the stumble still remains, jet-down 2 steps - then Apr 6, 2013 · I found the reason for the backfiring through the carb at WOT. It'll still cruise fine, but when I depress the clutch Dec 3, 2019 · The Carter/Edelbrock AFB and AVS carburetors are decent right out of the box, but learning to tune their fuel metering system will make them really come aliv Feb 1, 2016 · The car idles fine and pulls hard at WOT, I replaced the HEI distributor with a Pertronix 1, all wires and plugs as I thought it may be an ignition problem. I could actually idle it down to under 500 if I wanted. vacum to timed port 4. This one (1906 650cfm) has a bad stumble when you mash the gas. Jul 27, 2020 · I am experiencing the exact same situation both with the exhaust pops and the stumble at 1700rpm unless you bring the AFR way down but then other sacrifices are made, the engine has yet to break out of single digit fuel economy on all highway tanks, over 2000 miles. Jun 3, 2011 · I have a completely rebuilt Edelbrock 600 sitting on a 1" spacer on an Edelbrock intake on a mild build 350 SBC with manual fuel delivery system. Carb set at nr 3 in the chart. Recently installed a PF4 on a Ford 302, after initial parameter setup and initial start, everything worked great. Sep 21, 2019 · Sure enough, after finding my inline spark detector (worth its weight in gold), I noticed when the engine starts to stumble the spark totally disappears. 30 over) with a new Edelbrock carb and Edelbrock performer intake sitting on top. Aug 28, 2004 · I'm trying to tune my Edelbrock Performer 600 using Edelbrock's procedure (of doing 2nd gear torque pulls with a video camera on the tach, and then using a stop-watch to time the "pull". I`ve checked the plugs at that very opening, running about a steady 30mph. 2 plane intake. But what if I want an electric choke and a performance tune? This is what most of us want for our street cars, so we get the 1406 and begin the process Mar 16, 2021 · This provides more capacity than WOT fuel burn so the pressure at the carb is a steady 5. If it was just jetting a few sizes out it would stumble then catch. Pressure was set to 43psi (bounces btwn 42. But light stumble to WOT. Nov 17, 2006 · WOT. 340. If I put the truck in 4th gear at 1000 rpm and WOT it start bucking and won't stop unless I let off the throttle. 11:1 I always get ask how to adjust an edelbrock carburetor and tuning it for a modded engine#adjusting #sbc #vortec #lt4 #1406 #1407 #650cfm #600cfm Mar 5, 2006 · While sitting in neutral I can go WOT and it starts to stumble just past 3300 RPM. Aug 15, 2010 · I have a mercruiser 4. I've been taking logs to try to figure out the issue but nothing has led me to the issue as of yet. Feb 21, 2024 · . Accelerator pump nozzle kit. This engine runs like a dream in the primaries, and in the secondaries. Vintage Air, AGR steering, Corbeau GTSII seats, 700R4 transmission, 12-bolt w/Eaton 4. Some more updates: I re-adjusted the fuel pressure at the pressure regulator, while having the vacuum reference hose disconnected from the TB (TB was capped to avoid vac leak). I got a pair of s/s precision springs. Light throttle acceleration is very weak. The car absolutely fries the 20" tires from a stop, but I get an off-the-charts lean stumble when I mash the throttle from cruising speed. 40's pretty consistently but always had a stumble and was hard starting. Short of that, you can do Second-gear bursts of 2 to 3 seconds each and have a passenger watch the meter. Car runs fat @ idle. Jul 30, 2010 · Yeah the pics above are screenshots from the Edelbrock pdf file for tuning. Sep 29, 2011 · Edelbrock Air-gap MSD 6A-L MP distributor (18 initial, 32 total timing) 904 torqueflite with 1800 stall converter Car weighs ~3000 with me in it Ok, so to describe the stumble. I am looking for help with my edelbrock avs2 650 carb. Aug 29, 2013 · I have spent many hours trying to get my Edelbrock #1411 750cfm carb to transition from cruise to part throttle accelerate. whenever this would happen, i find that the fuel mod settings go to zero. Immediate improvement. It's pretty bad, and only happens when I go to wot quickly. Another trick I do on the Carter/Edelbrock is to use thin aluminum from a soda can to make a splash guard over the secondary jet’s. This does wonders for Eddie carbs. The cruising stumble/misfire is still there. 420" / . The rods have 2 size of diameters the larger diameter controls the idle/cruise mixture and the smaller diameter at the end controls the power mode mixture when your foot is in the gas. I have installed the Pro Flo 3 on my '66 Chevelle. its kinda like a quadrajet with metering rods on te secondaries and different jet sizes on the primaries. 5psi 5. Longer stroke = more fuel when you punch it. every now and then i find my car wil begin to stumble, pop and even misfire during light cruise and wot. Dec 6, 2015 · The only real issue with Eddy's is that damn bog. I have a 350 sbc, holley systemax heads, 292/302 cam, street dom intake, and headers with a low pressure exhaust. 5-12. May 30, 2017 · I just put a carburetor kit in my Edelbrock 600 cfm 4 barrel caburetor (1406). Dec 19, 2006 · 331 WOT Stumble - Edelbrock Thunder Series. Set fuel pressure to 4. 8 under power. if you play around with it before putting it in place, you'll see that putting the rod on the bottom hole, actually pre-loads the plunger halfway down the shaft and shortens the stroke going from idle to WOT. Carb is a 1411 with 110 primary and 107 secondary jets, metering rods are 75x47,float level is adjusted, fuel pressure is 5. The carb is a Carter AFB Competition series 625cfm, and for the most part it performs really well. 4-17. Apr 23, 2021 · I have drive my Mopar 493 cui stroker today, 231/237@050 Comp cam xe275hl camshaft, 10,4:1 compression ratio. Jun 30, 2012 · The metering rods and springs are what control the A/F at part throttle power mode. Apr 20, 2021 · the Edelbrock manuals I finally figured out the problem. 0-15. 5-14. Jan 27, 2003 · Engine and Drivetrain Tech. range (Figure 1). If plug is bright white following WOT then need bigger secondary jets. Doing this creates a lurch, surge or stumble which gets quite annoying when coupled with the May 25, 2011 · I'm having off-idle stumble and there's a stumble when the secondaries come in. Simple enough. I am short on vacuum. 8) are great. This display originates from a TPS sensor we added to the Feb 6, 2024 · I have an Edelbrock 1902 Manual Choke AVS2 500cfm Carburetor. Jul 25, 2014 · The engine always ran like crap with that carb even after having them go through it again. Not really the carbs fault. 30 over, mild cam, 1. Sep 8, 2005 · This is super for WOT drag racing - ads an easy 15 hp on top end. 3642 Views 14 Replies 7 Participants Last post by 89Trooper, Dec 22, 2006. Using a higher rated spring means the carb goes to power /rich mode sooner as vacuum drops, which can help get rid of a bog. Power valve spring kit. I tried initial timing from 8-13 degrees and have tried nearly every jet/rod combination from 1 stage lean to 3 stages rich. ) Part throttle hesitation (going from light acceleration) 3. 08 rear gear, 255/60/70 tires. 5 area, but more important is to get the WOT down into the 12. I would set them Dec 10, 2018 · I checked on the Edelbrock website and my setup looks pretty much identical to the picture on their site of the 1411 (s hook installed the same as mine). 1. ) Run as much initial timing as possible based on your cam specs (i. Sep 19, 2008 · i kept adjusting and got it to where i was shifting right finally! and now it is not shifing at high rpm when im at WOT. I am thinking of installing a wide-band air/fuel meter to double check tuning. Feb 22, 2006 · I to had an edelbrock carb, mine was a 750. K&N air filter with the filter element on top as well as the sides. It has 20 miles tops on it. The measurement matches what is in the Edelbrock instructions. it seems to be more prominent when the throttle is abruptly cracked open form a stop but also when Apr 22, 2010 · Stumble at idle with slight backfire, idle speed dropped to 600 instead of 750 Idle is not adjustable anymore with mixture crews and idle speed srcew . If I step on the gas more than about 1/3 of WOT then the carb backfires and pops once or twice and then begins accelerating normally. I am using the stock fuel pump which gives 6-6. It wouldn't idle below 1500 rpms and WOT performance sucked ass. 005" richer [ preferably 0. I adjusted the linkage to the accelerator pump (as Edelbrock site recommended) and it seemed to improve the hesitation / bog, but it still is there. But the issue is related to temperature. Nov 9, 2008 · where I am at now after more talking with Edelbrock tech. Stock springs are probably 5” vacuum rating, and Edelbrock sells 6”, 7” and 8” springs. I'll explain how to get the most from your idle circuit. WB confirms PT snap doesn't go lean, WOT does. Jul 21, 2021 · - Edelbrock single plane - HEI - Patriot Swap headers into a 2. 1410. If you use a sharp edged pump cam on the 30 CC pump you may get satisfaction. Flattop. Mar 25, 2016 · That is some pretty good info and seems you have picked up quite a bit working on your truck but one thing though when using a vacuum gauge to get highest vacuum on setting idle mixture screws on engines with bigger cams and more overlap they require a richer mixture and for instance on my 350 with a lunati voodoo hydraulic roller cam with 272/280 219/227 @ 50 515/530 lift with a 112 lsa I get Jun 11, 2009 · I bought the tuning kit and went one stage richer on cruise and power, and installed the stiffer step-up springs. It was the vacuum advance canister on my Mallory Unilite Distributor. But, if cruising at 60mph or less and going wot, stumble, anything under 2000, it stumbles. my problem is it has a slight sputter or hesitation right off idle when the throttle is slightly cracked open. Perhaps I can maximize mileage also. Well, the 750 runs great, tan plugs all the way around, except for off idle, the car just wants to die, it bogs bady, almost like its too rich, but when I lessen the pump shot or lean up the idle it gets worse. youtube. And they all have an accelerator pump. 5 and timing is 36 @ 3000. Now it revs right up. Mar 11, 2021 · We often enlarge the "economizer" restriction in the booster to solve the lean off-idle stumble we often see on most of the edelbrock AFB and AVS clones but it does not cure the problem on the 750 and 800 cfm carbs since the transition slot is short and the internal passages are too small, I also think Tuner is on the right track in pointing Feb 3, 2018 · Carb is a 3310 with secondary metering block put on it. So, if you have the cruise and mid-power set right and you still more at WOT you'll need to increase the secondary jetting. But, light acceleration (especially going up hills) goes as lean as 16. Aug 30, 2019 · The ignition is MSD set at 14 degrees initial with 36 degrees total. 94/64cc heads, flat tops, performer intake, headers, all new h. They where white indicating lean mixture. Vacuum was around 13-14. I mostly understand the edelbrock tuning chart. Oct 9, 2017 · The engine runs and drives great except for Wide Open Throttle. Gap at . Cruise looks real good. Then I tried #1 stock setting and it would fall flat on its face from idle to WOT. I tried changing jets, spring, rods, timing, moving the accelerator pump arm, etc. ) Off idle stumble/hesitation 2. 5:1. Oct 16, 2007 · At very low throttle openings it has a tendency to have a small stumble. The engine briefly dies for half a second then picks up. I wonder why they don;t put this recomendation in the paper work they give with a Manifold. I have a FPR and have to set to around 4. As far as when they start to pull the rods out of the main jets under load. It's on a GMPP ZZ502, M21, 3:07 rear. 5:1 CR running 50/50 c12 fuel with edelbrock fuel pump 6. The 1405 carb is the performance version of the 600cfm carb. If there already is one, my apologies Please list motor,carb,intake,climate with changes you made to carb and results. What your calling off idle bog is probably actually a lean hole, it needs more pump shot. Jun 30, 2011 · Hey guys I need a little help with my edelbrock 1406. So your spark timing is 26 idle and 34 total max WOT now. The correction varies from -20 to -25. 0-12. Been experiencing off idle WOT and while accelerating bog/stumble/hesitation issuesacceleration has a slightly late response at the touch of the gas pedal. Feb 12, 2012 · 69 Camaro -originally a LM1 car. ) 600 CFM Edelbrock Performer carb model #1406. I did fatten up the ratio, went straight for setting #19 with the 0. 2 range, WOT is 12. Jun 28, 2019 · Running this carb on my L31. No matter how lean I set the idle a/f it always runs at around 12. It's a basic stock 305 last winter we put a Edelbrock RPM manifold, 600 Edelbrock, curved the distributor, headers and he tuned it up to the best of his abilityit ran 16. I put thread reducers on them, & threaded in spring pull studs. I’m going to need to put in a leaner set of metering rods for the secondaries because the mod to the emulsion tube richened up the AFR at wot. It hesitates all the way to around 3,000 rpm in all gears. Like the Edelbrock Thunder Series carburetors the AVS2 is based upon, this new design also retains the Air Valve Secondary for quick-and-easy fine tuning Feb 1, 2011 · An improper linkage ratio might result in a stumble or hesitation during quick WOT transitions. Yes, the 1406 is too big by formula, but can easily be made to work with some effort. Dec 7, 2007 · Edelbrock Performer heads, manifold, and a very mild 204 duration cam (recommended for the heads and manifold. Needed to stay on the clutch and rev the sh1t out of it to get moving otherwise it would stall. Sep 13, 2021 · So i been chasing this bog issue at WOT did different things like upgraded the squirter , moved the pump shot to the highest position step up springs/rod changes, while these things helped it did not make my bog disappear. the secondaries have a weighted air-valve that controls the opening rate But before you dive in as been said,get the ignition/timing dialed in before looking at going to deep with the carb. 7. A/F is about 12. When I first got my engine back (a little over a month ago) it was 180 out, and my mechanic came out and fixed that. I checked my old one and it was turned all the way in and ran fine. in a few seconds during the tip in. May 2, 2019 · WOT AFR is 12. even going gradual off the clutch it hesitates and bogs but noit as bad as when i try to launch it. 101" secondaries and the accelerator pump in the middle hole. Not tested next hole on acceleratorpump yet. Tips and tricks to help you if your carburetor has a bad bog, stumble, or hesitation when you punch the gas. I know it was set up as an economy tune by Edelbrock. I have developed an off idle hesitation stumble. 1475. Goes perfect at idle, light throttle, transition @ ca 0,95 to 0,97 at lambda. The 1406 (with electric choke) is tuned by Edelbrock for fuel economy. There is also a stumble going from idle to just off idle (about 12-14 on the TPS). Oct 25, 2007 · I have an Edelbrock 800 AVS. The rod that connects the accelerator pump is adjustable. May 21, 2018 · I've had the 1st gen estreet efi installed for about 2 weeks now. foot still on the floor after 1 second engine wakes up and takes off. This only happens as soon as i hit the gas. Sep 10, 2019 · - Brand new Edelbrock 1906 650cfm AVS2 Mech Secondaries So the problem i am having is that if press the throttle sharply I get a momentary bog or stumble. It seemed to help when I added the extra at cruise but that could be placebo So heres the problem: Jul 25, 2020 · I also found that if I work the throttle linkage at the carb and snap it to wot it doesn’t seem to have any stumble or hesitation. The car came with the 400 with the Holley 750, Edelbrock aluminum heads, beefy looking rockers, a good sounding cam, and long tube headers. 0 is usually used for mid-range power (non-WOT acceleration). 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. Go at least 0. I have a new 350 (bored . After some time I noticed the LT fuel trim at idle was really quite high so I put extra fuel into the fuel modifiers 15 at idle, 10 at cruise and 5 at WOT. Its not co Jun 7, 2013 · C3 Tech/Performance - Stumble after WOT - Soomy 1972 LT1 starts like a dream and runs good as well, but the problem I am having is after WOT, it doesn't want to idle properly, it almost stalls out. He lives about 20 miles away. I do have the wrong intake for the street but no matter what i did to this carb it would still bog from the start. May 29, 2010 · The high idle problem (the reason I took the unit off the car) has disappeared. 73 Jan 5, 2024 · I bought the Edelbrock 1940 AVS2 Calibration kit to swap and play with the springs to see if that fixes things. So, out of curiosity, I put the 750 edelbrock back on. Added Idle Spark up to 17 degrees then backed it off to 15 degrees. Dirt, debris, and old fuel can clog the carburetor’s jets, which restricts fuel flow and leads to poor performance. Secondaries will assist in controlling the WOT, along with the primaries. 89Trooper Discussion Starter Apr 20, 2014 · Hey guys having a little issue with my Edelbrock carb. But it only happens after I floor it and open the secondaries. I increased the pump shot and went rich on the jets, lean on the jets and whatever else i could try. You may also need to increase the nozzle size on the acc pump Jul 25, 2016 · It started good cold or hot, idled nice, WOT and part throttle were fine, but the problem was on slow take off it would want to die, every time. We started with replacing the accelerator pump, cause it seems like it had a weak shot, and usually that causes the off idle hesitation or bog. duration at . 040 stopped the part throttle snap stumble, but didn't fix WOT. set the choke to its leanest setting 3. usually from accel pump, ( squirters or pump lever) I would look a timing first, and vac advance, both can cause bog or stumble. ) I think the weather and other variables are messing with me, so I wanted to see if anyone has dyno-tuned thier 289 / Edelbrock and wouldn't mind sharing what Jul 28, 2021 · Hi. It also has Edelbrock headers and a wideband AFR gauge with dual exhaust and Flowmaster mufflers. 5psi at idle, although the Edelbrock manual states 5psi maximum. Changing accelerator pump slots does not seem to make much difference. I can run 85mph down the interstate as long as I don't got to WOT. Most times they come on the hole farther away from the fulcrum and need to be switched. to cover up bog , extras fuel must be introduced. This requires a dyno or 1/4 mile run. 327, Edelbrock E-streets, hooker, DUI performance distributors, ultradyne cam, stewart, TRW etc. I have tried different timing spots From 20 intial to 35 total Jun 15, 2021 · Engine is 496 bbc, racerite oval heads, 225/235,112lsa, 108icl hyd roller, edelbrock 1712 victor fuel pump, 1/2” tank pickup, 1/2” line to Holley fuel filter, 3/8” from filter to carb, fuel pressure is set at 5psi,hei dist, 18 initial, 36 all in at 2400rpm, th400, 3000 stall, 3. My car starts easy, runs great cold and for a little while once warmed up (I mean it runs perfect!), then it starts bucking, jumping, stalling. 4:1, solid lifter cam degreed, Holley SD intake, Edelbrock 800cfm Thunder, 3/8" fuel line from tank to carb, Edelbrock mechanical fuel pump, Pertronix Ignitor III, Flamethrower III Mar 6, 2021 · Ignition stumble missfire shows as Lean on the AFR guage. velocity is so slow that liquid gas drops out of the flow stream and when you punch the throttle, it takes several moments for the increased flow demand to transfer to the carb venturis. installed pressure regulator, and set to 5. 73 gear in the back. Aug 11, 2012 · Engine - ZZ383 stock internals, Edelbrock Performer RPM Air-Gap #7516, Edelbrock Performer RPM mechanical fuel pump #1721, HEI distributor with adjustable VA Proform #778-141-683, Doug's D368 headers, AC spark plugs MR43LTS . I have added crank fuel ( up to 5% on the 75 degree temp range) and also cold start enrichment ( Also the same range as the crank fuel). Aug 7, 2017 · First, this may be fuel or electric related or a combo of both. Transmission/Rear - 2004R/3. Sep 23, 2007 · My biggest problem with the Edelbrock Performer carbs is the fact that they are extremely susceptible to any dirt and for no better term, stumble, f@*t and fall on their collective faces with any in the float bowl. 5psi. Basically you have to ease the pedal into the power mode transistion or the engine falls flat. Feb 8, 2008 · When you say needle you mean the step up rod? and the spring is the step up spring under the rod plunger. Pull a plug and verify it has some color. With 21 inches of vacuum. Jan 10, 2009 · WOT StumbleWhy??? Jump to Latest 5K views 7 replies 6 participants last post by Big Dave Jan 11, 2009 Jun 2, 2019 · The engine starts and idles great, timing is 12-13 with full advance at about 35 (all mechanical, vacuum is plugged), I adjusted the idle set screws per the edelbrock manual and by the way I normally do (vacuum gauge) and either way i end up 1 1/4ish open on the idle set screws and about 17" of vacuum. Part throttle it seems to act ok, but WOT the car had the back fire like the plugs were loaded up or a plug wire crossed. 040 over edelbrock thunder avs 500 cfm carb, performer EPS intake, refurbed H. Jun 2, 2010 · if it's the same as the linkage on my 750 CFM, the top hole will give you the longest stroke out of the accelerator pump. 440, 10. The Edelbrock kit had a couple of cheap mis-matched springs in it. Engine almost dies. 3:73 gears. I set the idle mixture screws and I'm idling around 600-650. O. Oct 1, 2004 · I have an Edelbrock 600 carb that's about 4 years old. 442" 112° 107° on the cam with msd 8360 distributor and street fire wires. As for the mounts, I installed a couple of studs in place of intake bolts. ". Truck has had even before the single plane and HG swap a bog on transition from cruise to WOT. The price you pay is at the bottom end, air/fuel mixture velocity goes to crap. Edelbrock technical support offered no advice other than trying other maps. But regardless, 14:1 is too lean. put the right carb spacer on it (4 hole) 2. In addition if you hold the throttle at a constant input it will start popping out of the exhaust. ). But if i ease on the throttle slowly i don,t get the bog/stumble. Then use the metering rod settings for the 1405 carb, not the 1406. 5:1 to 11. I set the floats as outlined in the instruction PDF for the Edelbrock offroad needles on their website (7/16" and 15/16" drop). I've also heard/read that the float levels aren't correct from the factory and maybe I should see about my float levels. Feb 6, 2024 · Hi all, looking for some tips to look into. Had a little stumble, quite noticeable. e. Feb 20, 2006 · Classic Cougar Tech. NOTHING worked. Vacuum drops to 0 for a second and quickly goes to 8 or higher. I experience a backfire or stumble at WOT. Would be nice to get the idle into the 13. 5 range, and I can’t get it back into a “normal” range without going super heavy into the throttle. Accelerate hard from a start as long as I don't go to WOT. 5 PSI no matter the load and RPM on the engine. WOT the engine runs fantastic. street cam hydraulic very moderat. Apr 3, 2021 · I agree the WOT is lean, but since its in 1st gear it's not likely at maximum loading. Summit Racing. if it's a dead spot at a certain RPM, you might look into Hello. 045 gap, Edelbrock 1806 650cfm Thunder AVS carb. My AFR is 14:1 at idle, 14. Anyways, I was cruising the car and temps had come up to 180 and I decided to get on it while going through the gears. I would like to start a tech/setting list for edelbrock carbs. It depends on the combination. Air gap intake,aluminum heads, headers, comp cam 231 duration. 5 y pipe merging to a 3 inch dump - 10" Edelbrock Air cleaner - Holley Mighty Mite FP - Holley FPR (or Summit?) Etc. Idles great. 5 (sweet spot from my research). PS - if you do a skiboat start (idle to WOT), there is no hesitation. Oct 22, 2018 · Go to the Edelbrock website and print off the users manual for thier carbs. Step on the gas pulling away from a stop and hesitates to for a second then goes. I finally chucked that POS into the recycle pile and swapped on a Holley 750. Turn off engine coast to stop. Tuning Edelbrock Dual Quad Carburetors (how to get the most out of your Edelbrock two fours) *This is a compilation of knowledge sourced from experience, automotive industry practices and technics Growing up in the muscle car and hot boat eras of the 60’s and 70’s, I've had my share of carbureted motors, many of them with multiple carbs. 035" Autolite #3924 Champion RC12YC ¾" reach 14mm ⅝ hex Jun 14, 2009 · In other words, when I accelerate from 8-900 rpm's, when going through 1100 the engine will stumble. 8 spark control: 12 @ idle, 35deg @3000RPM, and 5 deg of vac. Jun 18, 2019 · Edelbrock 750 AVS carburetor. The best place for wide-open throttle (WOT) air / fuel testing is at the drag strip. Thats the only time this setup gives me issues. I get a slight stumble when I take off and sometimes when you increase the throttle from a cruise speed. 5 psi pressure 2" primary headers with a solid roller cam . Goes like stink. 031 part throttle snap sounds like I hit the throttle twice 1/2 a second apart, WOT snap stalls like the key was shut off WB shows instant lean. 1464 Nov 26, 2021 · Another possibility is to change the Edelbrock step-up springs, which control when the rods transition from cruise to power mode. When I cruise in any gear below 1900 rpm my AFR will read a bit lean, around 16-17. May 22, 2006 · Ok, here is a problem that I have had for a while with both holley and edelbrock carbs. No stumbling whatsoever, no slightly stinky idle, just runs out of go about 5000rpms, and fuel boils away after turning off. Its a Edelbrock 1406 model. I struggled for 2 days, trying to get rid of a stumble. Nov 22, 2021 · Tuning a Edelbrock AVS2 carburetor . Dave Jun 16, 2021 · Edelbrock makes a carburetor calibration kit that offers a slightly softer spring that will hold the metering rod in the jet a little longer, which will create a leaner mixture at part throttle. Nov 28, 2018 · Once float level has been verified, use a met rod with a richer power step for the part throttle stumble. At least try it first. com/watch?v=n_tUwd3EZews Jan 27, 2011 · Do a WOT pass. 0. Get some new plugs . I have the Edelbrock 1406 carb: I have the Edelbrock 2101 Intake: As you can see, the Edelbrock intake has a spread bore pattern where the carb has a square bore pattern. One issue that is consistent though is that on restarts once the engine has been running a while, the engine will not start unless the accelerator is depressed. If this fixes the stumble, lean out the power step on the rods until you have the rods just rich enough to remove the stumble. 8 at idle. Here's the kicker: Met a guy from Ebag that bought a distributor from me. The rod in their picture looks to be leaning back also. An intermediate value of about 13. 6 then jumping back to normal (depending on the throttle position), naturally when this happens the AFR is all over the May 21, 2020 · Hi Guys and Gals. For some reason the factory had the Allen adjustment screw turned out 3 1/2 turns. It scrammed at WOT. Well it runs great when on a flat, no incline surface. Jun 17, 2018 · By matching the right carburetor, the right squirter, and the appropriate nozzle sizes, Edelbrock has been able to replicate the smooth, stumble-free delivery of EFI with the AVS2 carburetor. WOT @3500 rpm is even worst. I checked all passages for plugging by spraying carb cleaner in them and verified they aren't plugged. so i tighten up my tv cable and im back to where i started with it shifting at 3,000 rpm from first to second under slow acceleration. 8-14. 035" Autolite #3924 Champion RC12YC ¾" reach 14mm ⅝ hex Jan 10, 2009 · You could try putting the accelerator pump rod into the more aggressive hole so it squirts more gas. Oct 27, 2012 · edelbrock 1411 WOT issue. Again, reading online I found the carb I have has a set of restricted secondary emulsion tubes. Apr 21, 2023 · Incorrect jetting; Dirty or Clogged Carburetor: A dirty or clogged carburetor can lead to a stumbling or hesitation issue. Timing is set at 18 initial and 32 total. Also, as a side benefit, the off-idle to WOT stumble has completely disappeared. 480 lift. Edelbrock calibration kit for 1410 carb. Mar 28, 2020 · this is probably YOU right now, and you don't even know it! adjust edelbrock float height - vintage TH289 video: https://www. Mar 31, 2023 · We'll jump into demystifying some of the scary carburetor tuning basics. This will only affect metering at part throttle. Carburetor is quickfuel Q950 race carb mechanical secondary's no choke. I removed the restriction and it definitely helped. Thanks. It does run, but not well. 1st Issue: Jan 7, 2011 · I think edelbrock carbs can be tuned using a kit that they sell. The first pic is idle, then part-throttle, then WOT. Jul 5, 2008 · I've been having a bog from idle on WOT with my Edlebrock 600CFM 1406 carb every since I installed an Air Gap intake. ) WOT hesitation (flooring it from a roll or dead stop) Here's how I fixed these two issues: Off Idle Stumble: 1. 6 heat range in NGK or 12 heat range in Champion. Feels like a "flat spot" from a carb with a too small an accelerator pump. My problem is my AFR gauge goes fat (and the Jeep feels fat as soon as I dip my toe into the main jets, and wide-open throttle (WOT) never goes leaner than 10. (WOT). 5 at idle to 15+. TYPICAL ENGINE A/F RATIOS FIGURE 1 METERING SYSTEMS The Edelbrock carburetor has three (3) basic systems that meter Jan 1, 2016 · I think that you may have a float level issue to start with and possibly a power piston setting problem. There is however a fairly substantial stumble/bog that occurs when flooring the throttle from cruise. Apr 12, 2021 · Cruise afr is 13. looks like your running fairly similar combo,quite a bit more compression lol, do run on the street much, any negative results from not running vacuum advance on the street, drivability or loading up issues ,I still need to get my exhaust hooked back up, so I dont have much seat time , open header WOT runs down my dead end street = cool neighbors , they May 17, 2020 · I have owned a dozen carter /edelbrock carbs over the years and they have always worked great out of the box. Apparently the accelerator pump was hanging up on the last portion of it's return stroke and that was not letting the primary butterfly to close completely most of the time. 3 vortec engine with a edelbrock 1409 (600) carb. Someone said I might need to advance the timing? Any suggestions Thanks Jan 18, 2024 · When I set the AFR down to 12 the stumble at 1700-2200rpm disappears. I have to "nurse" the throttle or engage Edelbrock is the most respected name in performance! Since 1938, Edelbrock has manufactured its core products in the USA for quality and performance. sometimes its just cruise, sometimes its cruise & wot. Shorter stroke = less fuel Out of the box they are usually set in the middle. It's somewhat common for WBO2 to indicate a higher AFR at WOT in the lower gears than in top gears. 305 heads (I think they are only off 2cc from stock) and 204° / 214° . axcef oyjdjd ecot ewciw tlypuoz degd lewcy dedo lgbzf pbdoc