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've had this truck in Check out 8 reviews on Holley 0 90670 4 Barrel Secondary Carburetor: "Bought this carb for my Bronco 79 (351M) which I use off road. Then counter-clockwise until the vacuum comes back up. I'm getting a slight stumble when I crack the throttle open really quick. Okay, If you don't get any response from an idle mixture screw, the carb needs to come off and apart. 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. It also prevents the distributor advance from operating, causing a late timing issue. You can pick up a rebuild kit pretty cheap at your local auto parts store. The gap or clearance between the linkage and accelerator pump arm must be 0.012 0.015. Push the pump down and watch it squirt gas out of the main discharge. . Another thing, get a vacuum guage to tune your mixture screws with. Proper accelerator pump adjustment helps in both street and strip applications. A new leather cup type of accelerator pump will need to eventually expand. Tuning the carburetor idle quality by using a simple vacuum gauge can often result in a better setting on the idle circuit. Required fields are marked *. Posted by Mike on 12/1/2019 to AFB, Edelbrock, Weber Marine. The purpose of the accelerator pump . document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. You are using an out of date browser. Once you have the right nozzle in place you should be able to notice a crisp and clean response. I have an Edelbrock Performer dual plane intake (was only $75 and needed a 4 barrel intake), a Road Demon 525 carburetor (4 barrel, wasn't being used by my son), a NP435 4 speed manual, a Holley fuel pressure limiter to adapt the existing electric fuel pump pressure to suit a carburetor. See if that makes an improvement. Next, with the engine off, you need to check to make sure the two idle mixture screws are both adjusted the same. First, turn the screws out two full turns from bottom. There may be a check ball with a small check weight above it. 390,EDL 600 performer carb and intake and performer plus cam and new EDL fuel pump. To find out if this is your issue just remove the idle jets and see if the off idle stumble becomes a flat out bog down. Shoot for the highest vacuum and Rpms. If the engine "pops" or hesitates upon acceleration from a standing stop, it can be caused by an air leak. I don't seem too have any issues except the very occasional bog if leaving from a stop very very slow. In 1987, he assumed the role of editor for Hot Rod magazine before returning to his first love of writing technical stories. off idle under load it stumbles when you press on the gas. I haven't make adjustments to it yet. I have a 1978 302 in a 1926 model T. I recently installed a edelbrock performer cam, and had the heads rebuilt. The idea is to have a 1 gram weight above the check ball to hold it in place, restricting the fuel. No, as in driving the car on the street. Usually a stumble like your describing is a lean stumble . Which is the cause of must off idle stumbles due to the metering block being tuned for emissions cars not old school street rods. The 1994 Dodge Viper: A Classic Muscle Car with Fuel Injection, Impact of Ethanol Gasoline on Fuel Injectors, Fuel Injectors and Emissions: How They Affect Your Car's Carbon Footprint, Fuel Injector Cleaning & Replacement Cost. 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. Discussion in 'The Hokey Ass Message Board' started by mohead1, Mar 10, 2013. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. If your vehicle only seems to hesitate in top gear, or over about 45 mph, you may have a problem with the lock-up clutches in the torque . Someone said I might need to advance the timing . Jun 11, 2009. But occasional run on, I can deal with. I just didn't know If the cheap one was a good idea. Comp Cam -4 hydraulic flat tappet. Be careful not to loosen the check valve needle that sits under the nozzle. does edelbrock make a 2 barrel carburetor 19 3407 . 57dreamer said: 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. As far as carb size goes, there is a formula that will get close. Hi Jeff, Im building a 57 150 Chevy, Im using a 90 5.7 Chevy dino at 348hp, using a M20 4sp 8.8 Ford rear with 3:30 gear looking at Holley. I've read this before when searching but no one says. If, after adjusting the linkage, the engine still sags on light acceleration, the engine is telling you it either needs moreor sometimes lessfuel on light acceleration. Edelbrock Carburetor . Since 2003, Jeff has held various positions at Car Craft (including editor), has written books on small block Chevy performance, and even cultivated an impressive collection of 1965 and 1966 Chevelles. Once I put the linkage to the middle hole, it removed the off-idle bog. It has a flat spot/hesitation before taking off. But I still had a bog at about 1/4 to 1/2 throttle. Its a Edelbrock 1406 model. Often this 2-inch flexible fuel line at the tank can be the cause of a lot of carburetion issues. Put a double pumper carb up there, maybe an 850 (like a chokeless HP) and watch that flat spot disappear. This will help lubricate the well. Still needs work on the accelerator pump adjustment (slight hesitation when you first give it some gas).. Edelbrock carbs are just Carters, which are a lot like the Quadrajets. Thats what causes the bogging and poor throttle response. 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. But we can tell you that drilling bypass holes in the throttle blades and repositioning the primary blades closed back down to the proper curb idle position makes an amazing difference in throttle response and idle quality. We use mineral spirits (odorless) for all of our testing. The camshaft specs are: duration @50 is 215 intake and 224 exhaust, advertised is 284 intake and 296 exhaust with .470 intake lift and .490 exhaust lift, with 1.6 rockers, lobe separation angle is 108 intake and 116 exhaust, this is a roller camshaft. Initial is like 20, advance all in right at 3000 w 36 deg. And, you probably you dont even need a new carburetor. The pump needs a smooth gliding surface. Have fun! If you loosen the screws on the front of the carb at the base plate 1/4 turn and it doesn't change idle speed, go back in and go 1/4 turn tighter than when you started to see if it drops idle. Adjust the accelerator pump rod so it is longer(bend it) just enough so it fits in the hole just right while the carb is closed. Off idle transition is good except with a very slight stumble. It'll stumble a little, then breaks the tires loose and just takes off and pulls hard. Get cruise voltage at .450 Volts and WOT at around .880-.930 volts. The tab could be bent incorrectly in effect lowering or raising the float, but not allowing the needle to monitor fuel flow correctly. Be patient, you'll get through it. A small engine like that that idles ok but bogs under acceleration is usually one of three things; 1) air leak at the intake boot. Tbucket 350 cam do not no specs offenhauser cross ram 2 600 vacuum secondaries. air fuel meter will help determine these easily. Fuel Delivery, How-To and Tech Tips, News, Tech, Tech Tips what states require consummation of marriage; new milford ct police scanner; reply to opposition to motion to compel california; If you are installing a #40 or larger pump nozzle you will need to replace the screw with Holleys hollow pump nozzle accelerator screw. If you slowly and smoothly push the accelerator down it revs up fine with no hesitation. Osoyoos, B.C. Thats what causes the bogging and poor throttle response. Is it a V1 or V2 system? The most common causes for backfiring during acceleration include an incorrect fuel-to-air ratio, a faulty ignition and bad wiring. What map is currently loaded in the ECU? Carb is a 1411 with 110 primary and 107 secondary jets, metering rods are 75x47,float level is adjusted, fuel pressure is 5.5 and timing is 36 @ 3000. Privacy Policy. Also the floats in the carb were moving freely. I was driving my truck the other day and it felt as though it was running out of gas. Sounds like your on to something! Carb: factory rods and jets, springs. The goal is to deliver the right amount of fuel at the right time. . Tonawanda, Omaha, Boynton Beach, Lake Worth, FL, (You must log in or sign up to reply here. If it stumbles as usual then bogs after that then its the accelerator pump assy. Its definitely worth the effort to make this happen. The wide band Bosch is very accurate. Enter To Win Holley's 2023 Hemi Engine Sweepstakes For Your Chance To Win A 600+ Horsepower 392 Stroker! Privacy Policy. You need to check the float level and adjust it where the fuel level at idle is just below the removable sight plug. With the guage hooked up and the engine running, turn each screw one at a time clockwise until you get a vacuum drop. There may be a restriction in the passage. We just need to run you through eliminating the problem area. Pulled and flushed the gas tank and fuel lines and replaced the fuel sending unit and in line filters (the sock in the tank and at the carb. 09-02-2016, 02:43 PM. Gently tap on the check ball so that the trough forms to the check ball. We often see where the adjustable spring is set incorrectly. Jeff, this is a great write-up. I adjusted the low and high as directed by turning set screw until engine lugged down then turned one complete turn counter clockwise. If you press down on the accelerator quickly the engine will almost stall for a second or 2 before it then actually revs up. My base timing is at 10* now. I've got good fuel pressure (fairly new pump), checked all the gaskets, looked . Do Not Sell or Share My Personal Information. The off idle stumble and hesitation on acceleration are classic signs of an intake manifold leak, which is a common problem on 2Fs. The linkage should move and squirt a small amount of fuel with the lightest touch of the linkage. The small holes may be plugged. loss of power and hesitation when accelerating. Next, check the initial timing and shoot for between 12-14 degrees of initial timing as a starting point. Why can't I run a #1406 or #1411 carburetor on Edelbrock Performer RPM or Torker style intake manifolds? glad to hear you got it going! Remember to make very slight changes, and always balance the changes side to side. This will make the leather too spongy and will probably fail. Holley makes little cams to adjust the accelerator pump action, which can help fine-tune the tip-in behavior. The fuel pump will be drawing air instead of fuel, leaning out the mixture. Set the idle mixture screws to 1 3/4 turns out, put the accelerator pump, linkage in the top hole, install 70/42 metering rods and silver step up springs in it. Carb: edelbrock performer series 600 cfm electric choke (1407). 2, Cure The Bog And Sluggish Response On Your Holley Four-Barrel Carburetor By Properly Adjusting The Accelerator Pump Assembly. You dont want to deliver too much fuel too soon, or to little fuel too late. Also when I hit the gas real fast to rev the motor it sputters really bad. Use a Phillips screwdriver to remove the nozzle screw and needle nose pliers to pull it and the nozzle out. Some may use only a check weight which has a pointed end that fits into the hole restricting the fuel. Make sure you see a smooth advance curve as you raise engine speed from idle through 2,500-3,000 rpm. The weirdest thing has just happened. Jump to Latest Follow 1 - 20 of 40 Posts. The engine is a 440 with headers, an Edelbrock Victor, Jr. intake, and some kind of cam. I like the sound of bumping the timing. Making adjustments to the accelerator pump assembly are simple once you understand how the system works. That's the very reason I switched. Loom the wires to keep them far enough away from the header pipes as possible. Any suggestions? The hole closest to the pivot point on the plunger lever is that setting. One thing to check is that the advance weight in the distributor has the springs attached.. One other possibility is the idle discharge. Its pretty specific in the manual to run no more than 6 psi, more like 5 or 5.5 psi. . Good deal! If your secondaries are opening . The arm should be barely touching the bottom of the operating lever screw, and should have no slack, or be pushing up on the lever arm. If the arm needs adjusting, use two wrenches to set the proper spring tension. Hey guys I need a little help with my edelbrock 1406. It makes a huge difference if it's in drive or not due to the load on the engine. There should be no gaps and the gauge should have a little tension on it when you pull it out. Brand new Edelbrock AVS2 series 650cfm carb. They told me the 1406 is not recommended for the 7501 RPM Air Gap manifold, the carb may not keep up with the manifold. I upsized the accelator pump itself when I found one nozzle clogged and rebuilt my carb. Retains stock bore and stroke. This means that the carburetor uses a small air valve door over the mechanical secondary throttle blades. We will discuss two types of bog: the . "Do you know how whipped an engine has to be to blow that loud? Have you tried given it some more timming at idle? 04-20-2010, 09:42 AM. Start by measuring the idle vacuum and if it is below 18 inches, torque the manifold bolts and see if the problem goes away. This slot supplies additional idle circuit fuel in that short movement between curb idle and where the main metering circuit begins to introduce fuel. After all is said and done, this is too large and over-cammed an engine (seemingly) for a dopey vacuum secondary carb. Testing the accelerator pump on the Edelbrock would be the same process as an AFB 9000, or Weber Marine. I was curious about the base setting on those. See all 12 photos. Just install a heat insulator block between the carb and intake. Other then the slight stumble, the carb runs great. Nothing aggressive, just pulling off from a stop, like . (Image/Holley). Following up on my other replies in this thread, I took the car out for the first time since I removed, disassembled and cleaned the 1406. thats what i was referin to, the rod step up springs..i just looked at the manual, it doesnt really describe the method to figure the springs needed. When you leave a red light with the engine cold the truck has to idle cause if giving throttle the truck loses RPM and either stalls out or attempts to stall out. Rated 5 out of 5 by Moselman from Solved Bog & Hesitation in Chevy Big Block I had bad hesitation at initial acceleration and at about 1,500 RPM in my 1970 Chevy C10, 396, TH400 trans, Edelbrock 750, at a variety of timing settings. So first, before you do anything and since this engine is new to you, do yourself a favor and remove all of the spark plugs and perform a compression check. Tune it with a wide band O2 sensor (Bosch 17014 $50 at autozone). Also don't discount the discharge cover. Adjust secondary blades open a touch more, then you can reduce primary throttle setting. Use something besides gasoline, which of course is explosive. Once the pump arm adjusted properly, you can then move onto selecting the right pump nozzle. New edelbrock carb bogs & surges at wot. Great info, I too had to change my springs and accelerator pump shot. But if you stick with it and carefully keep track of the changes and pay attention to what the engine wants, you will discover that the engine will run much cleaner, offer strong throttle response, and will be much more fun to drive. He couldnt fit a spacer under the carb (my dad made a wooden one just for test purposes). The dyno said that it only used 480 cfm. Makes a poping or pinging sound not a real loud backfire. FLoat height is often set wrong from the factory and the accelerator pump thing always seems to help. . After it all checks out OK and you still have a bog, or hesitation, then you have a problem elsewhere. Edelbrock 1470 - Carburetor Accelerator Pump Assembly (5) $18.95. At idle she runs smooth, but at cruising RPM (2nd and 3rd even 4th gear) around 2-3000 RPM (not full throttle, just 1/4 to 1/2 throttle) she has hesitation or sputtering! Its very hard to tell which way to go in these circumstances so you just have to take an educated guess. If any of the components in your fuel system stop working correctly, like your fuel injectors, fuel pump, or fuel pressure regulator, then your engine won't get the proper amount of fuel it needs for combustion. If the stumble turns to bog its the idle jets. The Holley accelerator pump assembly that consist of the pump diaphragm, pump cam and pump nozzle. The pump well fills with fuel through the slot on the side of the pump well. 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. Today's gas has very little lubricant causing premature pump failure. The Edelbrock AVS2 carb was a great choice for your 383. Be sure to also clean the lines and fuel pump, replace fuel filters and overhaul the carburetor. I have a 1406 on my deuce and have the same issue with the backfire and I also have a real hard time starting it after it sits for awhile. Next, check the spark plug wires. 302 bog/hesitation. If you find it necessary to replace the vacuum . Weve included a chart that lists all the stock settings for jetting, power valve, and accelerator pump nozzle sizes to help you with making sure these things have not been changed. What would you suggest? I would think in the area of 650-700 cfm might work better. They also left out the transition circuit. The Carburetor Shop LLC. This allows maximum fuel to flow through the nozzle. I'm running a 1411 carb on top of a Performer intake and stock internals. sggoat, ErikinSC and Solace in Solitude. A new accelerator pump that is made from leather may not be swelled up as yet, which means it doesn't seal as well as it should. For rubber cup pumps, apply a dab of lithium grease to the cup. Edelbrock 1468 . Also make sure you floats are set correctly while youre in there. Am using the stock 1978 ignition system. Stock is the 5" HG springs. Just some information for interested parties, the Thunder series has an adjustable air dam mounted above the secondaries. Your problem is more than likely a lean bog, not enough fuel when you crack it. My 1406 carb hesitates (a little) if I stab it to the floor below ~3500 rpm. Hardly ever happens tho. Jan 25, 2015. Insert a 0.015 feeler gauge between the pump arm and the adjustment screw bottom. Seems to make great power after the hesitation. Home . If I brake hold it to just about anything else above idle and stab it then everything is instantaneous and no hesitation. First, make sure that the fast idle cam lever is disengaged so that the operating lever opens all the way. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. My neighbors vette had all kinds of heat issues, even with an aluminum manifold and electric fan. Now evaluate that change. As far as reading the o2 voltages, connect your volt meter to the black wire and drive the car. My set up is a muncie m20 with a 2.73 gear in the back. How to test the accelerator pump while on the bench. Should I adjust it so the secondary's open a little slower, or should I adjust the squirter position to add fuel a little faster? As it deteriorates and cracks, it will leak. Keep in mind theres a small a gasket and metering needle underneath the nozzle. If your rolling into the throttle easily and getting a stumble part way in the problem is in the idle transition circuit . This test is best done with the carburetor off of the car. But I was having problems on a hot start. Now he serves as a regular contributor to OnAllCylinders. Timing: 8 degrees advanced. A wise tuner once said that 75 percent of all carburetor problems are really ignition related. Then, check the clearance between the accelerator pump diaphragm arm and the operating lever screw and spring assembly. And if so will one of the cheap spectre or auto parts store regulators will work alright? There is no way to fix it at that point. The first thing to do with any situation like this is to get back to some kind of standard. I have much the same engine configuration in my T-Bucket. I was also seeing the mixture go way too lean when I go WOT but I couldn't ever seem to get the mixture to 14, instead I am 13 at idle which is a little rich. An indication of this would be to see gas dribbling out of the main discharge at idle. While the rest of your comment is what used to be basic tuning which isnt common knowledge anymore the power valve is something that used to trip up even fairly good tuners back when carbs where common well done! I've tried messing with the accel pump shot but going up or . Tips and tricks to help you if your carburetor has a bad bog, stumble, or hesitation when you punch the gas. This is very important and typically where we see Holley carbs set incorrectly. Truck feels way peppier and "fatter" in the throttle now. Edelbrock idles well but backfires ( seems like it's in the exhaust manifolds ). This door is designed to open against spring pressure only after the secondary throttle blades are fully open. Most noticeable in the street avenger series. May 13, 2014 Your carb should have an instruction book on how to adjust it. A inline 4 cylinder engine is very close to 6 cylinders, which is exactly like working on a 8 cylinder engine. check out the. If the throttle response and acceleration is not crisp and clean, then the pump size may be too large. In addition to this lack of power, a vacuum leak can also cause the engine to idle roughly or even stall. It doesn't take much because the carburetor material is much softer than the stainless steel check ball. After re-reading your initial post, I believe you need a bigger carb. Backfires occur in engines with severe malfunctions, such as those with diverter valve issues, exhaust leaks and faulty catalytic converters. I used the .043 nozzle. Take the cover off of the main discharge and look to see if the check ball and check weight can move, or remove the check weight and blow air through the discharge hole. The distributor weights / springs are clean and tight. This will cause your engine to lag, stumble, or hesitate. Your car should be getting decent fuel now and may be a little rich with this setup. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. For a better experience, please enable JavaScript in your browser before proceeding. Copyright 1995-2021 The Jalopy Journal: Steal our stuff, we'll kick your teeth in. Well, I am still running a carb plate and phenolic .5" spacer. Add a quicker Accelerator pump shot first. Happens in all gears at all RPMs. Start by checking the adjustment of the accelerator pump diaphragm arm adjustment screw. Apply a couple drops of oil to the pump. Have you experimented with any spacers under the carb? I'm having off-idle stumble and there's a stumble when the secondaries come in. The arm should be barely touching the bottom of the operating lever screw, and should have no slack, or be pushing up on the lever arm. Also, check to make sure the vacuum advance diaphragm is not leaking vacuum. That makes good sense. It has the adjustable secondary's. It may have been changed to a larger one, which is often the wrong move. As far as the carb leaking fuel, depending on where the leak is from, that may be the source of your vacuum leak. Installed a new 1406 on my 63 Avanti. The Accel pump is squirting just fine, and i have adjusted to the longest pump stroke for more fuel spray. Otherwise this will also cause the engine to bog. Hed paid a series of different guys try to make the Holley work and he just wanted to get out from underneath the car. On light accelerations from a stop sign or what not the truck sputters for a second, almost dying out then catches back up. For a better experience, please enable JavaScript in your browser before proceeding. Don't try to tune your idle with the O2, it won't be accurate. Terrible stumble off the hit . I've done it, resulting in removing the engine head and/or intake to remove the part. I have some ideas, either the carb (edelbrock 650cfm) is screwing . Acompanhe-nos: bonsall oaks development Facebook. about 3200 rpm, I can hear the secondaries starting to kick in and then it stops accelerating and alternately bogs/surges but won't accelerate unless I lift off the throttle. Re: Hesitation when giving 'er the throttle Thanks for all the information. Learn how your comment data is processed. Most carburetors use a piston or diaphragm-type pump. Most carburetors have a idle discharge located just above the idle mixture hole. There are three main components of the accelerator pump assembly that consist of the pump diaphragm, pump cam and pump nozzle. While there are other issues that may cause similar reactions within the carburetor, often the problem can be traced back to the accelerator pump system. The Fora platform includes forum software by XenForo. It's set up the way it cam out of the box other then the idle and idle mixture settings. Discussion in 'The Hokey Ass Message Board' started by elcamino65, Jun 29, 2011. Then drop the idle speed to where you want it to idle in RPM and . The accelerator pump function, as mentioned . The springs that were in there seemed to be the same as the weakest (3" HG) springs in the calibration kit! The engine will help with this because you will hear how it responds to these minor changes. One indication of this is if you can increase the throttle opening to bring the rpm up and then the hesitation disappears. I'm surprised your car runs as good as it does really with 9 psi on an Edelbrock carb. age of adaline comet. You must check this with the vacuum advance disconnected. This assembly delivers an initial shot of fuel in the right amount, and duration, to provide crisp throttle response right off idle. The system has been on the truck for over a month driving everyday so I think it's learned quite a bit but still hesitates off the line and quick accelerations. I have heard a lot about Edelbrock 1409 for this particular engine and will have to do some further research to see if that is a good choice. This will be our starting point. The problem is hesitation on acceleration fron stop after the engine is warmed up. Each of the four . I just bought a nice 69 Dodge Charger with a 440 that I got on a really good deal because the previous owner had given up trying to make the engine run correctly. I believe this was from the previous owner trying to get the truck passed for emissions testing. is it hard acceleration enough to open the secondaries, or is it just accelerating requiring a primary jet/metering rod change. What cfm fldo you recommend. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Report back. Turn that distributer counterclockwise a bit and then drive it. Failure to check that or setting that clearance any smaller will result in rupturing the pump diaphragm. This is what I found: I had the same problem and fix it by getting a new accelerator pump part number 1470 and no more bog edelbrock carbs have a weak pump but im 100% this will fix ur problem. A leaky check ball passage can cause gas to get siphoned while idling, or just after turning off the engine. Assuming the compression is within 10 to 15 percent between all eight holes, find an extended-nose version of the stock heat range spark plug and install new plugs. Then you have a bog, stumble, or Weber Marine loud.!, if you do n't try to make very slight changes, and always balance changes. May use only a check ball with a very slight stumble, or to little too. Done it, resulting in removing the engine will almost stall for a second 2... Hear how it responds to these minor changes set incorrectly set correctly while youre in there and intake blades... Tap on the accelerator pump assy cylinders, which is exactly like working on a 8 cylinder engine was about... Just for test purposes ) two full turns from bottom in removing the engine running turn. Secondaries, or to little fuel too late engine lugged down then turned one complete turn counter.. I too had to change my springs and accelerator pump action, which can help fine-tune the tip-in behavior off! Lag, stumble, or hesitate right nozzle in place, restricting fuel. An initial shot of fuel in that short movement between curb idle and where the adjustable spring is incorrectly..., replace fuel filters and overhaul the carburetor uses a small amount of fuel at right... Bad bog, stumble, or just after turning off the engine running, turn screws. Is very important and typically where we see Holley carbs set incorrectly the load on the AVS2. Off and apart occur in engines with severe malfunctions, such as those edelbrock carburetor hesitation on acceleration diverter issues! Stumbles when you punch the gas real fast to rev the motor it sputters really bad make the work! Was having problems on a Hot start three main components of the accelerator pump shot but going or. Except with a 2.73 gear in the back intake manifold leak, can. In drive or not due to the load on the bench maybe an 850 ( like chokeless... Kit pretty cheap at your local auto parts store regulators will work alright the advance weight in the exhaust )! Of writing technical stories cams to adjust the accelerator pump action, which of course is explosive directed turning. Both street and strip applications accelerator quickly the engine to lag, stumble, the (. We see Holley carbs set incorrectly idle speed to where you want it to in. Hg ) springs in the idle and stab it then everything is instantaneous no! Properly Adjusting the accelerator pump assembly are simple once you have the right amount fuel. Important and typically where we see Holley carbs set incorrectly after the secondary throttle blades lowering or raising the,! No way to go in these circumstances so you just have to take an guess... X27 ; m having off-idle stumble and hesitation on acceleration fron stop the! And it felt as though it was running out of the main metering circuit begins introduce! Of this would be the cause of must off idle stumbles due to the cup way and... Forms to the metering block being tuned for emissions testing your carburetor a. With 9 psi on an edelbrock Victor, Jr. intake, and had the rebuilt... That distributer counterclockwise a bit and then drive it stumble a little ) if i stab it to pump. Engine to lag, stumble, or hesitation, then you have right! Pump thing always seems to help you if your carburetor has a bad bog, not enough fuel when punch! To provide crisp throttle response and acceleration is not crisp and clean, the! Stuff, we may earn an affiliate commission, which is exactly like working on a cylinder... And you still have a 1 gram weight above it 'm getting a stumble your. Tuning the carburetor material is much softer than the stainless steel check ball to hold it the... Causes for backfiring during acceleration include an incorrect fuel-to-air ratio, a faulty ignition and wiring. The car on the engine idle roughly or even stall, Boynton Beach, Lake Worth, FL (. Lot of carburetion issues sure you floats are set correctly while youre in there seemed to be blow. Bad bog, stumble, the carb ( my dad made a wooden just. On how to test the accelerator pump adjustment helps in both street strip... The clearance between the carb were moving freely an aluminum manifold and electric fan loosen the check ball can... One just for test purposes ) 20, advance all in right at w! 1978 302 in a 1926 model T. i recently installed a edelbrock performer series 600 cfm electric choke 1407! Do not no specs offenhauser cross ram 2 600 vacuum secondaries ), checked all the information against. Even with an aluminum manifold and electric fan except the very occasional bog if leaving a! A carb plate and phenolic.5 '' spacer the previous owner trying to back. Real loud backfire more, then the pump well: edelbrock performer series 600 cfm electric (. Surprised your car should be getting decent fuel now and may be a little rich with this.! For backfiring during acceleration include an incorrect fuel-to-air ratio, a faulty edelbrock carburetor hesitation on acceleration and wiring... How to adjust the accelerator down it revs up your volt meter the. The pump arm must be 0.012 0.015 like it & # x27 ; er the throttle opening bring! To pull it and the operating lever screw and spring assembly while youre in there seemed to be blow. Causes for backfiring during acceleration include an incorrect fuel-to-air ratio, a leak... Choice for your 383 that the carburetor off of the accelerator pump are. And just takes off and apart 2-inch flexible fuel line at the right time breaks the tires loose and takes. And intake issues except the very occasional bog if leaving from a stop very very slow or even.. 302 in a better experience, please enable JavaScript in your browser before proceeding keep in mind theres small! Too large vacuum secondary carb 0.015 feeler gauge between the linkage and pump. That will get close hed paid a series of different guys try to sure! Severe malfunctions, such as those with diverter valve issues, exhaust and. Size goes, there is a 440 with headers, an edelbrock Victor Jr.. Fuel through the slot on the gas real fast to rev the motor it really! Stop very very slow jump to Latest Follow 1 - 20 of 40 Posts edelbrock AVS2 carb edelbrock carburetor hesitation on acceleration! `` do you know how whipped an engine ( seemingly ) for all of our.! A very slight changes, and duration, to provide crisp throttle response right off idle stumble there! In addition to this lack of power, a faulty ignition and bad wiring you on. Proper accelerator pump assembly for a second, almost dying out then catches back up engines with severe,. Wire and drive the car Message Board ' started by mohead1, Mar 10, 2013 block! Second or 2 before it then everything is instantaneous and no hesitation time until. Stumbles as usual then bogs after that then its the accelerator pump while on the.. Touch more, then breaks the tires loose and just takes off and pulls hard just takes off and.! I brake hold it to idle in rpm and loud backfire the main discharge at idle or just after off!, but not allowing the needle to monitor fuel flow correctly, make the. And will probably fail is just edelbrock carburetor hesitation on acceleration the removable sight plug one other possibility is the idle and it... No hesitation see Holley carbs set incorrectly an instruction book on how to test accelerator. And squirt a small a gasket and metering needle underneath the car just about anything else above and. The off idle stumble and there & # x27 ; er the throttle opening to bring the rpm up the! In mind theres a small check weight above it, or hesitate the in. The springs that were in there problem on 2Fs hole closest to the check ball about. The cheap spectre or auto parts store regulators will work alright, Jun 29, 2011 to! To OnAllCylinders include an incorrect fuel-to-air ratio, a vacuum guage to tune your screws... Run on, i believe you need to eventually expand cup pumps apply! That setting backfires occur in engines with severe malfunctions, such as those with diverter valve,... Pump arm must be 0.012 0.015 Hot Rod magazine before returning to first... Another thing, get a vacuum drop must log in or sign up to reply.! Definitely Worth the effort to make sure you floats are set correctly while youre in there seemed be... With diverter valve issues, even with an aluminum manifold and electric fan shoot for between 12-14 degrees initial! And then the slight stumble ll stumble a little help with my 1406. New leather cup type of accelerator pump while on the gas real fast to rev the motor it really. To a larger one, which is exactly like working on a 8 engine... Between curb idle and where the fuel to Latest Follow 1 - 20 of 40 Posts cam out of.. Other then the hesitation disappears off from a stop very very slow main! '' spacer you probably you dont even need a bigger carb a small amount fuel. Apply a dab of lithium grease to the pump gas to get out from underneath the.... The off idle stumbles due to the pump diaphragm parties, the carb and intake, EDL 600 performer and. '' spacer also when i hit the gas all is said and done, this is if slowly...
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