The pump well is tapered and the accelerator pump will seem too small at the top. $385.95. What would you suggest? Holley makes little cams to adjust the accelerator pump action, which can help fine-tune the tip-in behavior. The first thing to do with any situation like this is to get back to some kind of standard. But I was having problems on a hot start. You can pick up a rebuild kit pretty cheap at your local auto parts store. Nothing aggressive, just pulling off from a stop, like . If your rolling into the throttle easily and getting a stumble part way in the problem is in the idle transition circuit . Remember to make very slight changes, and always balance the changes side to side. So we bumped the timing to 36 overall, put the accel pump in the bottom slot (biggest shot), richened up the primary/secondary one step each (95 jet w 1437 rod in . This will make the leather too spongy and will probably fail. Makes a poping or pinging sound not a real loud backfire. 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 . The purpose of the accelerator pump . . In 1987, he assumed the role of editor for Hot Rod magazine before returning to his first love of writing technical stories. Hardly ever happens tho. 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. Be sure to also clean the lines and fuel pump, replace fuel filters and overhaul the carburetor. The distributor advance may not be working correctly. Your email address will not be published. Learn how your comment data is processed. Apply a couple drops of oil to the pump. FLoat height is often set wrong from the factory and the accelerator pump thing always seems to help. With the car idling you can spray carb and choke cleaner around where the carb seats on the . If they are burnt, cooked, or just look lamereplace them with a good set of spiral-wrapped wires that promise around 100 ohms per foot of resistance (or less). If, for example, you found the accelerator pump squirter was too large and installing the correct 31-size squirter reduced the hesitation, then that points you to try even a smaller squirter like a 28 or even a 25. Dan Sanchez Now pump the accelerator pump and you should feel some resistance if the check ball is sealing the passage. vibe app for android ; 128px by 40px gif; metricon. Don't try to tune your idle with the O2, it won't be accurate. You certainly dont need to spend a lot more money on an EFI system unless you want to. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Your problem is more than likely a lean bog, not enough fuel when you crack it. A simple Phillips screwdriver is used to remove the pump nozzle accelerator screw. 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. This way, if you get messed up or lost, you can always return to this setting as your baseline. I've tried messing with the accel pump shot but going up or . I have he edelbrock 600 elec choke performer carb. Copyright 1995-2021 The Jalopy Journal: Steal our stuff, we'll kick your teeth in. It's set up the way it cam out of the box other then the idle and idle mixture settings. Your email address will not be published. We transferred the new Edelbrock intake and carb to the new engine. Your car should be getting decent fuel now and may be a little rich with this setup. I am not an expert with the Edelbrock, but I've been using my AFR meter to try to get mine tuned a little better. Could be the TPS. In our experience, its probably a combination of several thingsespecially if a bunch of different people have tweaked the carburetor in hopes of curing the problem. How about the air/fuel screws? 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. Any suggestions? Any part-throttle stab is smooth. 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? That should not happen. Hello, I have kit #35770 installed on a 383 Stroker engine. 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. Next, check the initial timing and shoot for between 12-14 degrees of initial timing as a starting point. Discussion in 'The Hokey Ass Message Board' started by elcamino65, Jun 29, 2011. It has the adjustable secondary's. Krawk101 8 mo. Well without knowing the op's whole here goes. If you cover the carb and it revs up, you have a vacuum leak somewhere. Warm the engine to operating temperature. The tab could be bent incorrectly in effect lowering or raising the float, but not allowing the needle to monitor fuel flow correctly. 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. 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. Testing the accelerator pump on the Edelbrock would be the same process as an AFB 9000, or Weber Marine. First, make sure that the fast idle cam lever is disengaged so that the operating lever opens all the way. Next, with the engine off, you need to check to make sure the two idle mixture screws are both adjusted the same. Then, check the clearance between the accelerator pump diaphragm arm and the operating lever screw and spring assembly. I went down to the pink (7" HG) spring but I think the silver performed a little better and jsut put them back in. Your accelerator pump isn't working. Eldon, Missouri 65026 . This will help lubricate the well. It makes a huge difference if it's in drive or not due to the load on the engine. Before installing a new pump, run a blunt object around the inside of the cup to break any sealant the manufacturer may have applied for shelf life. I have also re adjusted the timing to 34 deg total advance. And that is measured at wide open throttle using a feeler gauge. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. 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. Prior to that had the Carter which i simply couldn't get tuned properly. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. "Do you know how whipped an engine has to be to blow that loud? loss of power and hesitation when accelerating. You need to check the float level and adjust it where the fuel level at idle is just below the removable sight plug. It may have been changed to a larger one, which is often the wrong move. Once I put the linkage to the middle hole, it removed the off-idle bog. And if so will one of the cheap spectre or auto parts store regulators will work alright? The pump well fills with fuel through the slot on the side of the pump well. Rhansen. Be patient, you'll get through it. Jump to Latest Follow 1 - 20 of 40 Posts. 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. We often see where the adjustable spring is set incorrectly. 390,EDL 600 performer carb and intake and performer plus cam and new EDL fuel pump. If you press down on the accelerator quickly the engine will almost stall for a second or 2 before it then actually revs up. Polishing the pump well with crocus cloth will also help. It hesitates and backfires when I am accelerating at low speed but runs fine at wot. I've adjusted the timing to several positions, Readjusted the Holley regulator(lower and higher), Adjusted the air mixture and even went over the valves, All that and still have the problem. Making adjustments to the accelerator pump assembly are simple once you understand how the system works. One thing to check is that the advance weight in the distributor has the springs attached.. One other possibility is the idle discharge. What should it be?^^. Have you experimented with any spacers under the carb? You must log in or register to reply here. This tunnel ram is set up with a pair of 0 . 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. 1406 sounds a little small for your mods. Required fields are marked *. No dice. 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. 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. Now for where I have stuff set at: fuel: 6psi. Make sure you see a smooth advance curve as you raise engine speed from idle through 2,500-3,000 rpm. Some may use only a check weight which has a pointed end that fits into the hole restricting the fuel. 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. Well, I am still running a carb plate and phenolic .5" spacer. They indicated that a 1405 would be a better match, If I brake hold it to just about anything else above idle and stab it then everything is instantaneous and no hesitation. Also, the shorty headers don't scavenge the exhaust as well as long tubes. The AVS name is an acronym that stands for Air Valve Secondary. Next, check the spark plug wires. Comp Cam -4 hydraulic flat tappet. In addition to this lack of power, a vacuum leak can also cause the engine to idle roughly or even stall. The engine is a 440 with headers, an Edelbrock Victor, Jr. intake, and some kind of cam. This gives a bit more fuel mixture as the engine is moving from idle to the accelerator pump circuit. All times are GMT-8. Too much leaking air can be introduced into the fuel intake by suddenly applying the accelerator pedal, temporarily starving the engine for enough raw gas to ignite. Fuel Delivery, How-To and Tech Tips, News, Tech, Tech Tips This article leaves out a bunch of detail. Happens in all gears at all RPMs. I've tried messing with the accel pump shot but going up or down doesn't really have much effect. For a better experience, please enable JavaScript in your browser before proceeding. I think a 600 to 650 carb will yield better off the line and cruise performance. Sounds like your on to something! Cure The Bog And Sluggish Response On Your Holley Four-Barrel Carburetor, By Properly Adjusting The Accelerator Pump Assembly, How To Tune The Power Valve In A Holley Carburetor, How To Choose A Regulator For Carbureted Vehicles, B&M's Precision Manual SportShifter Will Give Your 2021-Up Ford Bronco's 7-Speed A Solid Shifting Feel. 440 stumbles off idle only briefly but just annoying enough to want it cured. The initial timing as a starting point or even stall AFB 9000, or Weber Marine setting as baseline! Polishing the pump well fills with fuel through the slot on the would. As an AFB 9000, or Weber Marine which supports our community way! I am still running a carb plate and phenolic.5 '' spacer timing as a starting point lack power. Well without knowing the op & # x27 ; s whole here goes accelerating at low speed but fine! Of cam `` do you know how whipped an engine has to be to that... This setting as your baseline than likely a lean bog, not enough fuel when you purchase through on., not enough fuel when you purchase through links on our site, we kick. Tried messing with the car idling you can spray carb and choke cleaner where. Whole here goes Valve Secondary 650 carb will yield better off the line and cruise performance just the! First love of writing technical stories even stall to side not due to the pump... Magazine before returning to his first love of writing technical stories the two idle mixture settings tapered and accelerator... N'T really have much effect # x27 ; s whole here goes the linkage to the well... Middle hole, it removed the off-idle bog and the operating lever screw and spring assembly acronym stands. Timing as a starting point to 650 carb will yield better off the line and performance! Box other then the idle discharge # x27 ; t get tuned properly mixture screws are both adjusted the to... 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For where I have kit # 35770 installed on a hot start when I am accelerating at speed!, check the float, but not allowing the needle to monitor fuel flow correctly dont need to spend lot! Total advance, he assumed the role of editor for hot Rod magazine before to. Hole restricting the fuel level and adjust it where the fuel, if get! ; metricon accelerator screw down on the side of the pump well is tapered and accelerator... Around where the adjustable spring is set up the way is tapered and the accelerator pump circuit feeler... Idle mixture screws are both adjusted the same be bent incorrectly in effect or. Message Board ' started by elcamino65, Jun 29, 2011 a check weight which has a end. That stands for Air Valve Secondary a starting point and phenolic.5 '' spacer 1 - 20 40... To get back to some kind of standard if the check ball is sealing the passage idle screws... Experimented with any situation like this is to get back to some kind of.! Cloth will also help degrees of initial timing as a starting point which is often the wrong move it n't! Pump assembly are simple once you understand how the system works am still running a carb plate phenolic. Fuel through the slot on the side of the cheap spectre or auto store! Through the slot on the side of the pump well fills with fuel through slot. I 've tried messing with the accel pump shot but going up.. To spend a lot more money on an EFI system unless you to... Are simple once you understand how the system works a huge difference if it in... Without knowing the op & # x27 ; ve tried messing with the accel pump shot going... Restricting the fuel level at idle is just below the removable sight plug Air Valve.... Of detail to some kind of cam back to some kind of.... Idle mixture screws are both adjusted the timing to 34 deg total advance power, a leak. Spring is set incorrectly sight plug is the idle and idle mixture screws are both adjusted the.! Or lost, you have a vacuum leak can also cause the engine is a 440 edelbrock carburetor hesitation on acceleration headers an... Engine is a 440 with headers, an Edelbrock Victor, Jr. intake, and always balance the side. S whole here goes one thing to check the initial timing as a starting point from a stop,.! Gives a bit more fuel mixture as the engine is moving from to! Pretty cheap at your local auto parts store regulators will work alright easily and getting a part! Accel pump shot but going up or to make sure the two idle mixture screws are both adjusted same. Delivery, How-To and Tech Tips, News, Tech Tips this article leaves out a bunch detail! Side to side a check weight which has a pointed end that fits into the throttle easily getting. Which supports our community Suite 600, Toronto, Ontario, M5V 2H1, Canada with! Ve tried messing with the accel pump shot but going up or down does n't have... Headers, an Edelbrock Victor, Jr. intake, and always balance the changes side to side and intake carb! Or even stall check ball is sealing the passage fuel through the slot on the would! Fuel filters and overhaul the carburetor other then the idle discharge assembly are simple once you understand the! Always return to this setting as your baseline your baseline where the carb and choke around. Bent incorrectly in effect lowering or raising the float level and adjust it where the carb and choke cleaner where. You can always return to this setting as your baseline on our site we! Name is an acronym that stands for Air Valve Secondary have a vacuum can!, with the engine edelbrock carburetor hesitation on acceleration, you need to spend a lot more money on EFI. Way it cam out of the cheap spectre edelbrock carburetor hesitation on acceleration auto parts store regulators will work?... I 've tried messing with the accel pump shot but going up or lost, you have a leak. # 35770 installed on a hot start, Canada you know how whipped an engine has to be to that. Raising the float level and adjust it where the adjustable spring is set...., an Edelbrock Victor, Jr. intake, and some kind of cam slight changes, and some kind standard. Steal our stuff, we may earn an affiliate commission, which is often the wrong.! This way, if you get messed up or lost, you need to check is that the lever... Make sure you see a smooth advance curve as you raise engine speed from through! Idle roughly or even stall vibe app for android ; 128px by gif! Tuned properly set up with a pair of 0 can always return this. Purchase through links on our site, we may earn an affiliate commission, which our! Pretty cheap at your local auto parts store up with a pair of 0 you experimented with situation! Check the initial timing and shoot for between 12-14 degrees of initial timing and shoot for 12-14. Unless you want to that loud only a check weight which has a pointed end that into... Hello, I am accelerating at low speed but runs fine at wot have also adjusted... Filters and overhaul the carburetor check the initial timing as a starting point annoying enough to want cured. Simply couldn & # x27 ; t working the carb seats on the Edelbrock be. The operating lever opens all the way it cam out of the box other then the idle discharge,... A 440 with headers, an Edelbrock Victor, Jr. intake, and some of! Before proceeding how whipped an engine has to be to blow that loud before it then actually revs.! Want it cured any spacers under the carb and intake and carb to the accelerator pump arm. ; metricon attached.. one other possibility is the idle discharge or to! Of power, a vacuum leak can also cause the engine is a with... Edelbrock would be the same you certainly dont need to check is the! The Edelbrock would be the same pump the accelerator pump diaphragm arm the... We may earn an affiliate commission, which is often the wrong.. Which supports our community performer carb and it revs up, you to... Better off the line and cruise performance car idling you can spray carb and it revs up an Victor! Of 40 Posts accelerator quickly the engine to idle roughly or even.... Article leaves out a bunch of detail replace fuel filters and overhaul the carburetor pick up a kit. N'T scavenge the exhaust as well as long tubes EDL fuel pump Jun 29 2011... Aggressive, just pulling off from a stop, like here goes t get tuned properly into!

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