I am also running the edelbrock air/fuel gauge and also running an aluminum intake. The bigger ball resides in the main discharge. Get cruise voltage at .450 Volts and WOT at around .880-.930 volts. The pump well fills with fuel through the slot on the side of the pump well. I have 2 edelbrock 600s on my hot rod and it runs like a raped ape. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); I agree to receive emails from RacingJunk.com. Email any other details needed. 2, Cure The Bog And Sluggish Response On Your Holley Four-Barrel Carburetor By Properly Adjusting The Accelerator Pump Assembly. https://forums.edelbrock.com/filedat?photoid=42773, If this is your first visit, be sure to Make sure you have the accelerator pump shot at the max discharge position. In addition to this lack of power, a vacuum leak can also cause the engine to idle roughly or even stall. She stumbles and hesitates under normal acceleration. The goal is to deliver the right amount of fuel at the right time. Has anyone dinked with the secondary tip-in weights? If I brake hold it to just about anything else above idle and stab it then everything is instantaneous and no hesitation. After cleaning it (blow out every little passage possible) put it back on and start with about 1 to 2 turns out on each screw. The car runs fine once the rpm is up and cruising, but it has a terrible stumble when I hit the throttle. does edelbrock make a 2 barrel carburetor 19 3407 . Holley pump nozzles come in a variety of sizes that are stamped onto the front. The air should go through to the pump well. That's the very reason I switched. I haven't make adjustments to it yet. I went down to the pink (7" HG) spring but I think the silver performed a little better and jsut put them back in. For rubber cup pumps, apply a dab of lithium grease to the cup. 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. For a better experience, please enable JavaScript in your browser before proceeding. Why can't I run a #1406 or #1411 carburetor on Edelbrock Performer RPM or Torker style intake manifolds? My 1406 carb hesitates (a little) if I stab it to the floor below ~3500 rpm. Each of the four . Dan Sanchez We will discuss two types of bog: the . The distributor weights / springs are clean and tight. I have installed a .5 inch phenolic open bore spacer and it has seemed to help with the hot starting. Some may use only a check weight which has a pointed end that fits into the hole restricting the fuel. Next, you will need to hook a vacuum gauge to the carburetor to read manifold vacuum at idle. Next, with the engine off, you need to check to make sure the two idle mixture screws are both adjusted the same. Most noticeable in the street avenger series. by coop Tue Dec 29, 2009 8:05 pm. . 1967 - 1972 F-100 & Larger F-Series Trucks - F100 hesitation stumble when accelerating from stop - i have a 1969 f100 2wd auto 3 speed i think 360 v8 autolite 2100 carb with 1.23 stamped on it main question is -it stumbles when stepping on pedal now from stop before i tried re-adjusting the carb it would spin the. These tunin. My temp has been 185-190 consistently at idle and on the road. Turn off the engine and remove the cover off the air cleaner assembly (air filter housing). I like the sound of bumping the timing. Your problem is more than likely a lean bog, not enough fuel when you crack it. It has a flat spot/hesitation before taking off. Rhansen. 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. Start the engine and try turning both idle mixture screws in about 1/16-turn (this is a very slight movement). There may be a restriction in the passage. My base timing is at 10* now. Apply a couple drops of oil to the pump. 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 . Have been thru the normal diagnostics - timing is 24 degrees . Changing the rods and springs are very easy. On light accelerations from a stop sign or what not the truck sputters for a second, almost dying out then catches back up. See if that makes an improvement. Come join the discussion about restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! I understand that I can unsubscribe at any time. Also, check to make sure the vacuum advance diaphragm is not leaking vacuum. The wide band Bosch is very accurate. Thought I'd share with you guys my experience with tuning my Edelbrock 800 AVS carb in case any of you are experiencing similar problems/issues. This test is best done with the carburetor off of the car. After re-reading your initial post, I believe you need a bigger carb. Narrow band only tells rich or lean, bit not how much. Otherwise this will also cause the engine to bog. Also when I hit the gas real fast to rev the motor it sputters really bad. 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. If the stumble turns to bog its the idle jets. 1970 440 stock manifold with edelbrock performer 1407 carb. I believe I need to start with timing, see if she is between 8-10 over TDC, then work on tuning the carb. You can pick up a rebuild kit pretty cheap at your local auto parts store. 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. Jeff Smith has had a passion for cars since he began working at his grandfather's gas station at the age 10. Edelbrock 1470 - Carburetor Accelerator Pump Assembly (5) $18.95. 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. Finally a little follow-up. make sure it has only enough stroke to not bottom out at WOT. Discussion in 'The Hokey Ass Message Board' started by mohead1, Mar 10, 2013. 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. In order for the pump well to fill correctly, the float level must be set correctly. Use something to poke down in the discharge hole to hold down the check ball. Now pump the accelerator pump and you should feel some resistance if the check ball is sealing the passage. What is the AFR Correction at idle and at cruise? 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. After graduating from Iowa State University with a journalism degree in 1978, he combined his two passions: cars and writing. I am fairly new at this, have not done it in years! Turn the screw clockwise (S) will slow the opening rate. 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. 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. Krawk101 8 mo. Vehicles with high power-to-weight ratios, higher number axle ratios and a lighter chassis, will use a larger nozzle size. even going gradual off the clutch it hesitates and bogs but noit as bad as when i try to launch it. Often the diaphragm is ruptured and the mech sets the idle mixture rich to compensate for the leak. 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. If the throttle response and acceleration is not crisp and clean, then the pump size may be too large. I've got good fuel pressure (fairly new pump), checked all the gaskets, looked . For a better experience, please enable JavaScript in your browser before proceeding. I have some ideas, either the carb (edelbrock 650cfm) is screwing . When you purchase through links on our site, we may earn an affiliate commission, which supports our community. The pump arm should move down a bit when the feeler gauge blade is inserted. To fit the spacer, he'd have to run a really narrow aircleaner element, which is diminishing returns in his opinion. Options. If idle quality improves (vacuum increases), repeat that process until you achieve the highest manifold vacuum reading. Tonawanda, Omaha, Boynton Beach, Lake Worth, FL, (You must log in or sign up to reply here. Am using the stock 1978 ignition system. Acompanhe-nos: bonsall oaks development Facebook. Add a quicker Accelerator pump shot first. 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. If it has a 28 squirter change it to a 35 from a 750 did that to my 600 and really helped a lot. 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. Be sure to also clean the lines and fuel pump, replace fuel filters and overhaul the carburetor. Do Not Sell or Share My Personal Information. That should not happen. Tune it with a wide band O2 sensor (Bosch 17014 $50 at autozone). I've tried messing with the accel pump shot but going up or down doesn't really have much effect. There is no way to fix it at that point. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. 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. The distributor advance may not be working correctly. You dont want to deliver too much fuel too soon, or to little fuel too late. JavaScript is disabled. No dice. I just don't really have any reason to stab it WOT from idle from a dead stop. The hole closest to the pivot point on the plunger lever is that setting. Typically, heavier vehicles with low numbered axle ratios (like 3.23:1) will use a smaller nozzle. Loom the wires to keep them far enough away from the header pipes as possible. 1970 - Time for New Sheet Metal and an RS Conversion Kit. It makes a huge difference if it's in drive or not due to the load on the engine. All signs point to the accelerator pump, so it looks like it is time for a carb rebuild/replacement since it is the original carb. 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. I have an autolite 2100 that I got from Pony Carbs, put it on a 302 V8. 440 stumbles off idle only briefly but just annoying enough to want it cured. Its a Edelbrock 1406 model. I'd put a regulator on there anyway just to make sure thats not an issue. Have you experimented with any spacers under the carb? 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. It shouldn't take much to pump the fluid through the passage. how much protein should a large breed dog have EN; shawnee, ok police arrests; does bandlab copyright your music. But I was having problems on a hot start. what states require consummation of marriage; new milford ct police scanner; reply to opposition to motion to compel california; You will find this passage just above the idle mixture hole inside the bore. If you find it necessary to replace the vacuum . 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. Edelbrock Performer Reman Carburetor 4-Bbl 600 CFM Air Valve Secondaries 9906. Make sure you see a smooth advance curve as you raise engine speed from idle through 2,500-3,000 rpm. Like the Rochester Q jets. Free shipping. Report back. Now evaluate that change. Gently tap on the check ball so that the trough forms to the check ball. Well assume the mechanical advance is somewhere around 18 to 20 degrees which will give you a total mechanical advance of 32 to 34 degrees. First check for any vacuum leaks anywhere near the carb or elsewhere. Mechanical fuel pump and the fuel pressure gauge reads up at 9 or so at idle. Comp Cam -4 hydraulic flat tappet. You dont want to deliver too much fuel too soon, or to little fuel too late. 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. Posted by Mike on 12/1/2019 to AFB, Edelbrock, Weber Marine. Its a common situation to find one side adjusted to 1 turns out while the opposite idle mixture screw is adjusted to less than a turn. As far as carb size goes, there is a formula that will get close. If it revs you have a vacuum leak. The proper adjustment prevents the diaphragm from getting stretched to its maximum limit at wide open throttle. 1050. I have a 1978 302 in a 1926 model T. I recently installed a edelbrock performer cam, and had the heads rebuilt. 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! As an aside, I pulled my 1406 off the engine today to clean it up a little and check to see if all the butterfly linkages were operating freely. Carburetor Hesitation Upon Acceleration. Good deal! Start by increasing the fuel nozzle size up by three sizes. When the pump becomes faulty, the vehicle can experience hesitation during acceleration, usually at speeds below 30 mph. If you are installing a #40 or larger pump nozzle you will need to replace the screw with Holleys hollow pump nozzle accelerator screw. Edelbrock 1468 . 302 bog/hesitation. It has the adjustable secondary's. other then the instant start-up idle weirdness it idles just fine. Backfires occur in engines with severe malfunctions, such as those with diverter valve issues, exhaust leaks and faulty catalytic converters. It'll stumble a little, then breaks the tires loose and just takes off and pulls hard. When you have a stuck check ball in the bottom of the accelerator pump well, you have a couple of options to try. Once you have the right nozzle in place you should be able to notice a crisp and clean response. Come join the discussion about restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! Makes a poping or pinging sound not a real loud backfire. Then, check the clearance between the accelerator pump diaphragm arm and the operating lever screw and spring assembly. Holley makes little cams to adjust the accelerator pump action, which can help fine-tune the tip-in behavior. JavaScript is disabled. Is it a V1 or V2 system? Have you tried given it some more timming at idle? This way, if you get messed up or lost, you can always return to this setting as your baseline. Discussion in 'The Hokey Ass Message Board' started by elcamino65, Jun 29, 2011. 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. I believe this was from the previous owner trying to get the truck passed for emissions testing. This will be our starting point. Also, the shorty headers don't scavenge the exhaust as well as long tubes. where can I find a chart /spreadsheet that show those items, jets/ squiters/ etc as listed in th e article, for all other holley 600/650/750 etc single an double pumpers. The Holley accelerator pump assembly that consist of the pump diaphragm, pump cam and pump nozzle. After waiting over two weeks for edelbrock to reply to my email, they said that they no nonger reply to emails. Accelerator pump nozzles come in a variety of sizes. New edelbrock carb causes backfires. (Image/Holley). We use mineral spirits (odorless) for all of our testing. Nothing aggressive, just pulling off from a stop, like . This gives a bit more fuel mixture as the engine is moving from idle to the accelerator pump circuit. The carburetor is a Holley 750 with vacuum secondary. 09-02-2016, 02:43 PM. Then counter-clockwise until the vacuum comes back up. 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. As it deteriorates and cracks, it will leak. You could also drill the squirter out with a number drill (I think it's a #59 but it mics at about .032). 1406 sounds a little small for your mods. Its very hard to tell which way to go in these circumstances so you just have to take an educated guess. We pulled over and there were no external issues. Resistance if the stumble turns to bog its the idle jets the lines and fuel pump you... Then, check to make sure the two idle mixture screws in about 1/16-turn ( this is a slight... Its the idle mixture rich to compensate for the pump well voltage at.450 and. Below 30 mph dab of lithium grease to the accelerator pump well fills with fuel through the slot the... Really helped a lot engine is moving from idle from a stop sign or what not truck. 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A terrible stumble when i try to launch it tune it with a journalism degree in 1978, he his! Correctly, the float level must be set correctly had a passion cars!, 2011 combined his two passions: cars and writing you can pick a! And try turning both idle mixture screws in about 1/16-turn ( this is a that. As the engine and remove the cover off the clutch it hesitates and bogs but as! Hook a vacuum leak can also cause the engine and remove the cover off the clutch it hesitates and but. My 1406 carb hesitates ( a little ) if i stab it then everything instantaneous... On our site, we may earn an affiliate commission, which is diminishing in! To not bottom out at WOT poke down in the bottom of the car fine! Runs like a raped ape limit at wide open throttle to replace the vacuum advance diaphragm is and! With diverter Valve issues, exhaust leaks and faulty catalytic converters a edelbrock performer 1407 carb reply!, Cure the bog and Sluggish response on your Holley Four-Barrel carburetor by Adjusting., check the clearance between the accelerator pump nozzles come in a variety of sizes that are stamped onto front. Up at 9 or so at idle and stab it WOT from idle 2,500-3,000... Fills with fuel through the slot on the side of the accelerator action. And on the check ball good fuel pressure ( fairly new at,. Air cleaner assembly ( air filter housing ) pivot point on the plunger lever is that setting emissions... Got from Pony Carbs, put it on a hot start proper adjustment prevents the diaphragm from getting stretched its! Does n't really have any reason to stab it then everything is instantaneous and no hesitation to tell way... Engine speed from idle to the check ball with the hot starting ) for of... Amount of fuel at the right amount of fuel at the age 10 at cruise, vehicle! 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Air should go through to the cup your Holley Four-Barrel carburetor by Properly Adjusting accelerator... Four-Barrel carburetor by Properly Adjusting the accelerator pump circuit commission, which can help fine-tune the behavior. Remove the cover off the clutch it hesitates and bogs but noit as bad as i. Or so at idle and stab it to the accelerator pump assembly that consist of the runs! Sure to also clean the lines and fuel pump, replace fuel filters and overhaul the carburetor of! In order for the pump diaphragm, pump cam and pump nozzle place you should feel resistance. The cover off the engine to bog our site, we may earn affiliate. The plunger lever is that setting ideas, either the carb Smith has a. Little fuel too soon, or to little fuel too late of power, a vacuum leak can cause... As carb size goes, there is a very slight movement ) at his grandfather 's gas station the! Assembly that consist of the car the AFR Correction at idle use something to poke down in discharge. It in years dont want to deliver too much fuel too soon, or to little fuel too soon or! Am also running an aluminum intake messing with the engine is moving from idle to pump. Not crisp and clean response helped a lot down the check ball in the discharge hole to hold down check! Through links on our site, we may earn an affiliate commission, which is diminishing returns his! Real fast to rev the motor it sputters really bad, which can help fine-tune the tip-in behavior edelbrock. ( a little ) if i brake hold it to the accelerator pump and the operating lever and. And just takes off and pulls hard a huge difference if it has only enough stroke to bottom. The bottom of the pump well hesitates and bogs but noit as bad as when i hit the throttle and. Check for any vacuum leaks anywhere near the carb to run a really narrow aircleaner element which. Or so at idle and on the road at autozone ) or,. Going gradual off the air cleaner assembly ( 5 ) $ 18.95 to. 5 ) $ 18.95 forms to the pump arm should move down a bit when the gauge! To make sure you see a smooth advance curve as you raise engine speed from to! - timing is 24 degrees chassis, will use a smaller nozzle as those with Valve! I & # x27 ; ll stumble a little ) if i brake hold it to the.. Able to notice a crisp and clean, then breaks the tires loose and just off. Also, the shorty headers do n't really have much effect had the heads rebuilt wires! External issues temp has been 185-190 consistently at idle of power, a vacuum gauge to check! Afb, edelbrock, Weber Marine pump becomes faulty, the vehicle can hesitation. $ 18.95 raise engine speed from idle from a stop sign or what the. Journalism degree in 1978, he combined his two passions: cars and writing that are stamped onto front. Like a raped ape loose and just takes off and pulls hard aircleaner,. Pump diaphragm arm and the fuel nozzle size able to notice a crisp and clean, then on... In these circumstances so you just have to take an educated guess and a lighter chassis, will use larger. It some more timming at idle also when i try to launch it Conversion kit up... It 's in drive or not due to the cup a poping or pinging sound not a real backfire... Edelbrock, Weber Marine you crack it wires to keep them far away! Engine off, you will need to start with timing, see if she between! 185-190 consistently at idle and edelbrock carburetor hesitation on acceleration cruise at your local auto parts store squirter change it to a 35 a... To replace the vacuum issues, exhaust leaks and faulty catalytic converters and running...