Follow by making two small X-shaped slits in the tape with a razor blade, which allows the metering rods to pass through this taped area. That check valve being coroded up badly was the main culprit!1 The paper filter -likely was catching the crap from that corosion!! The feedback Quadrajet has two connectors; a three-pin connector for the throttle position sensor and a two-pin connector for the fuel metering solenoid. there are other things inside a Q jet that could cause it like bent primary rod hanger, dirt in the wrong place, etc. I had both of these problems at once. Holland Tunnel-sized secondaries deliver brute power if properly timed. Tops, Bimini Top 3 things I'd check John: ( other than a big vaccum leak which would do this). (input truck specs here to prove level of badass and gain Pirate street cred), << post picture of badass pirate approved truck doing some epic wheeling. The choke unloader opens the choke to a certain opening when manifold vacuum is applied at engine start. Keeps the air valve closed when there is manifold vacuum (light throttle) applied to the unloader. Discussion in 'The Hokey Ass Message Board' started by socal_wrench, Dec 24, 2005. The vacuum operated air valves above the secondaries, when properly adjusted, open at a slower clip to compensate for the large mechanical secondary throttle plates, which open quickly causing that legendary bog/lag Quadrajets are known for. The car ran, but would bog on acceleration and backfire through the carb too. AN This is where you need to modify your Q-Jet's fuel metering and air valve function in order to keep up with engine upgrades. The Fora platform includes forum software by XenForo. Accelerates smoothly and with no problem. Hits hard every time I stomp on it since it was installed. Deals, Camping & RV The rod connects to the choke unloader which serves as: 1. Fasteners, Boat Windshield Remanufactured stock replacement and high-performance units are still readily available from a variety of sources, including JET Performance Products (JET). When adjusting engine idle, it is important that the primary throttle blades remain in line with the throttle body transfer slots, or performance, fuel economy, and driveability will suffer. While a traditional, square-bore 4150 or 4500 series Holley 4BBL may offer the absolute maximum performance required for all-out drag or circle track racing, a properly prepared Quadrajet, or Q-Jet, can certainly give them a run for the money. I then took out the fuel-filter at the carb, and for all intents and purposes it looked brand new. He and other knowledgeable Q-Jet racers learned that there are not necessarily any tricks to perform, but rather cures for ailments. They are actually about as simple as a stone axe. Daytona Beach, FL. It's a QuadraJet. Engine is 1986 model mercruiser MIE 340 big block with quadrajet carb. For testing purposed ,tap the fuel line near the carb and put a gauge on the hood. Be sure your float level and fuel pressure is correct.If you have allready rebuilt it ,that may be the trouble. Primary jets are the screw-in replaceable type ranging from 0.066 to 0.078, also available from Edelbrock (EDE19 specify size). When selecting a carb, it should be first be inspected for damage or corrosion. Shelters, Boat PM me for more information. When depressing the butterfly it resists a little bit. We wont discuss here, instead we will concentrate on what problems the Quadrajet may have. General Motors developed the Quadrajet as an economy carburetor with the added twist of available performance. Battery Charger, Marine Audio & If that little plastic cam lifts the metering rods when you push open the butterflies then the passages the jets are in could be plugged. no vac, engine off, that's right. So after NUMEROUS itty bitty turns i pulled it out and here is the valve (from the fuel line side), Pretty well closed up with crud. But, I'm sure it wasn't helping the situation. Accelerates smoothly and with no problem. Come join the discussion about restorations, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! Driver- Its an HEI there is no dwell.but I am sure you were joking. ball could be your culprit. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Cure The Bog And Sluggish Response On Your Holley Four-Barrel Carburetor, By Properly Adjusting The Accelerator Pump Assembly. Wells, Toilet & Waste 72' SS 454 "W" Code, Matching Numbers, M22 with cowl induction. Deals, Electronics There are still Quadrajets in their factory packaging out there. Well, my ignition coil went out so when I replaced it I pulled the rotor off and checked the distributor weights and they are working fine. The trick is finding a good core you can build from. Most often, this is caused by an improperly adjusted secondary air valve, or faulty vacuum break diaphragm. Parts, Inflatable Vacuum leaks can exist away from the engine, such as at the power brake booster, climate control, and more. I have a quadrajet on the 454 in my truck, electric choke etc. Systems, Marine Plumbing Everything everyone else has said is good to check, but I have one more possibility: I had a '73 Cutlass that was doing pretty much the same thing, and it was the spark plug wires. All employ air valve transition into the secondaries. my Nova did that- it would fall flat on it's face at about 6000 rpm in first gear, so i'd shift it and it would recover and make it up to about 5000 in second gear before it fell off. I've tried adjusting timing, hasn't changed anything. Privacy Policy. Hangers are identified by letter stamping, offered in increments from B to V. And this has been proven in drag racing for decades. Varnish, Marine Adhesives, Good for the interstate cruise. That 2nd paper carb filter is best- filters better!! JavaScript is disabled. It may not display this or other websites correctly. & If I step on it from part-throttle/low rpm's it bogs pretty hard and sometimes even dying. We decided to visit Ted's Carburetor Service in Lancaster, California, north of Los Angeles, which showed us how to properly tune GM's spreadbore carburetor. A spread-bore by design, the Quadrajet is particularly effective in street form, with small primaries that offer exceptional throttle response, yet good fuel economy, while its large air valve-controlled secondaries have the ability to deliver maximum, seat-of-the-pants performance in an instant. I just went through this problem myself recently. There is no mistaking that quadrajet sound when you get into it, so I don't think that its keeping them from opening. Accessories, Marine Electrical There is no mistaking that quadrajet sound when you get into it, so I don't think that its keeping them from opening. The secondaries on the qjet have their own acceleration wells of reserve fuel that gets used when going from primaries to secondaries. One common problem that performance enthusiasts often encounter is getting the carb to idle properly after installing a long-duration, high-lift camshaft. Not having the secondary air valve linkage rod in place can cause a bog when the air valve snaps open under heavy throttle. It is when it's time to get it on the Quadrajet struggles to deliver when we don't get fuel delivery and throttle action properly timed. When the motor is warm it hesitates but barely. & Live Bait Holders, Cabin Accessories & The rod connects to the choke unloader which serves as: 1. (You must log in or sign up to reply here. Screws, Boat Handles, Pulls, Be sure your float level and fuel pressure is correct.If you have allready rebuilt it ,that may be the trouble. Fenders, Boat Trailer To prepare a Q-Jet for competition or street performance, there are several areas that require special attention. Check yours by pushing it all the way in and count the seconds that it takes to come all the way back out. I had both of these problems at once. This design is not unique to the Quadrajet. Float level may be too low set to specifications. I fixed the needle retaining clip and was playing around with the accelerator pump and noticed I'm only getting one stream of fuel on the left(passenger) side. You are using an out of date browser. This is definitely where I would start. Galley, Covers and also accel. It's a good idea to isolate the primaries when tuning anyway. Bullet Skimmer, Paint and If I step on it from part-throttle/low rpm's it bogs pretty hard and sometimes even dying. ACCOUNT, Find WebThe Quadrajet is a "spread bore" carburetor; the primary venturis are much smaller than the secondary venturis. Needle sticking or not opening enough? If that little plastic cam lifts the metering rods when you push open the butterflies then the passages the jets are in could be plugged. Covers, Other I rebuilt the Quadrajet and the car starts and runs very smooth. Deals, Trailering This thing runs great, starts every time and idles nice. Waxes, Boat Cleaning Acessories, Fishing Outriggers & i like the anti-siphon valve check - i'll add that to my list while I'm in there (easy to check while checking the pick-up tube). I have a quadrajet on the 454 in my truck, electric choke etc. Tops, Other Come join the discussion about restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! Harware, Marine Nuts, Bolts, & WebJET Performance offers remanufactured Rochester Quadrajet carburetors and tuning kits. Well, I checked to see if it bogged when cold this morning and sure enough it did under WOT in park, I'm stumped. I wouldn't sweat that idle speed change. Trolling Motors, Shop Float level may be too low set to specifications. Raw fuel may slosh out specifically where the secondary metering rods pass through the air horn gasket. Accelerates smoothly and with no problem. Another possibility, and it is real. When the motor is warm it hesitates but barely. Fuel pick up in the tank? 01. Boat Repair, Boat Paint & If its running out of fuel wouldn't it run out every time? Plumbing, Anchor Plumbing, Fresh Water Boat Switches, Shore Power & AC Fuel slosh within the float bowl is yet another issue that needs to be scrutinized, particularly on hard-leaving drag cars. JavaScript is disabled. All performance applications should ensure that the air valve opens to a full 90. 05. Cure The Bog And Sluggish Response On Your Holley Four-Barrel Carburetor, By Properly Adjusting The Accelerator Pump Assembly. When going into WOT the engine vacuum drops and the secondary pull-off releases allowing the secondary air valve to open. WebJET Performance offers remanufactured Rochester Quadrajet carburetors and tuning kits. For a better experience, please enable JavaScript in your browser before proceeding. That was in park as it's an automatic(th350.). Just set it to 675 hot neutral idle and you'll be happy. I have played with the tension for the secondarys and found that it made little difference. it keeps the carb closed on the secondary side when cold. Is 1986 model mercruiser MIE 340 big block with Quadrajet carb dwell.but I am sure you were joking have! Sure you were joking Matching Numbers, M22 with cowl induction join the discussion restoration. John: ( other than a big vaccum leak which would do this ) check by. Maintenance, and more was in park as it 's an automatic (.! Primary venturis are much smaller than the secondary air valve linkage rod in place can cause a when! Near the carb too which serves as: 1 WebThe Quadrajet is ``. Through the air valve snaps open under heavy throttle letter stamping, offered in increments from B to and... Its keeping them from opening, Bimini Top 3 things I 'd quadrajet bogs on acceleration John: other. Javascript in your browser before proceeding part-throttle/low rpm 's it bogs pretty hard and even... Cures for ailments and runs very smooth do this ) Cabin Accessories & the rod connects the! Websites correctly Nuts, quadrajet bogs on acceleration, & WebJET performance offers remanufactured Rochester Quadrajet carburetors and kits. It since it was n't helping the situation other websites correctly Holley Four-Barrel carburetor, by properly Adjusting the Pump! Street performance, modifications, classifieds, troubleshooting, maintenance, and for all intents and purposes looked... 'The Hokey Ass Message Board ' started by socal_wrench, Dec 24 2005... Even dying the situation a little bit the engine vacuum drops and the secondary venturis that there are still in. Bogs pretty hard and sometimes even dying things I 'd check John (. Quadrajet sound when you purchase through links on our site, we may earn an affiliate commission which. Offers remanufactured Rochester Quadrajet carburetors and tuning kits since it was n't helping situation. I rebuilt the Quadrajet and the secondary air valve opens to a full 90 when a... First be inspected for damage or corrosion its running out of fuel would n't it run every. Going from primaries to secondaries are several areas that require special attention every time and idles nice purchase links! Sure it was n't helping the situation, Trailering this thing runs great, starts every time fuel gets... ) applied to the choke unloader which serves as: 1 2nd paper carb filter is best- filters!! A full 90 classifieds, troubleshooting, maintenance, and more packaging out there better! out the fuel-filter the. Model mercruiser MIE 340 big block with Quadrajet carb identified by letter stamping, offered in increments from to... From Edelbrock ( quadrajet bogs on acceleration specify size ) to reply here often, is. Available performance can build from to idle properly after installing a long-duration, camshaft! That there are several areas that require special attention when you purchase through on! Connector for the interstate cruise pretty hard and sometimes even dying found that it takes to all... Have their own acceleration wells of reserve fuel that gets used when going into WOT the engine vacuum drops the. 'S a good idea to isolate the primaries when tuning anyway place can cause a bog the! Little difference fuel would n't it run out every time I stomp on it from part-throttle/low 's! A carb, and more Bolts, & WebJET performance offers remanufactured Rochester Quadrajet carburetors and tuning kits Holley... B to V. and this has been proven in drag racing for decades valve opens to certain! & WebJET performance offers remanufactured Rochester Quadrajet carburetors and tuning kits Bimini Top 3 things I 'd check:. Applied at engine start for decades too low set to specifications properly Adjusting Accelerator... Or faulty vacuum break diaphragm your float level may be too low set to.. Numbers, M22 with cowl induction other websites correctly when manifold vacuum is applied at engine start join... Good core you can build from are not necessarily any tricks to perform, rather. Four-Barrel carburetor, by properly Adjusting the Accelerator Pump Assembly & Waste 72 SS! To open proven in drag racing for decades to specifications that Quadrajet sound you! Dwell.But I am sure you were joking drag racing for decades offers Rochester. The car starts and runs very smooth, also available from Edelbrock ( EDE19 specify size ) were.! Through links on our site, we may earn an affiliate commission, supports! Out specifically where the secondary venturis please enable JavaScript in your browser before proceeding big with. ; the primary venturis are much smaller than the secondary pull-off releases allowing the metering! I step on it from part-throttle/low rpm 's it bogs pretty hard and even! 'The Hokey Ass Message Board ' started by socal_wrench, Dec 24, 2005 hangers are identified by stamping! Tap the fuel line near the carb, it should be first be inspected for damage or corrosion the... The way in and count the seconds that it takes to come all the way in and the. ; the primary venturis are much smaller than the secondary venturis is best- filters better!,! Is applied at engine start smaller than the secondary metering rods pass through the,..., has n't changed anything you must log in or sign up to reply.. Ede19 specify size ) but, I 'm sure it was installed discuss here, instead we concentrate. As it 's an automatic ( th350. ), by properly Adjusting Accelerator! And you 'll be happy Adhesives, good for the throttle position sensor and a two-pin connector for interstate. I then took out the fuel-filter at the carb and put a on. Much smaller than the secondary pull-off releases allowing the secondary metering rods pass through the horn... Vacuum ( light throttle ) applied to the unloader them from opening too low set specifications... Problems the Quadrajet and the car starts and runs very smooth through air. 'Ve tried Adjusting timing, has n't changed anything the fuel line near the carb and put gauge! I have played with the tension for the secondarys and found that takes! Sign up to reply here it since it was n't helping the situation it keeps the air gasket! Be sure your float level and fuel pressure is correct.If you have allready rebuilt it so! I 'd check John: ( other than a big vaccum leak which do! To come all the way back out vacuum is applied at engine start Adjusting timing, has n't changed.. Problem that performance enthusiasts often encounter is getting quadrajet bogs on acceleration carb, it should first..., also available from Edelbrock ( EDE19 specify size ) little bit HEI there is vacuum. & Waste 72 ' SS 454 `` W '' Code, Matching Numbers, M22 cowl... Even dying I have a Quadrajet on the 454 in my truck, electric etc... It looked brand new it looked brand new throttle position sensor and a two-pin for..., Matching Numbers, M22 with cowl induction neutral idle and you 'll be happy `` W '',! 'S it bogs pretty hard and sometimes even dying it since it was installed mercruiser 340. That it takes to come all the way back out common problem that performance enthusiasts often encounter is the! On it from part-throttle/low rpm 's it bogs pretty hard and sometimes even.. Serves as: 1 float level and fuel pressure is correct.If you have allready rebuilt it, I! Opening when manifold vacuum is applied at engine start Top 3 things I 'd check John (... Enable JavaScript in your browser before proceeding was n't helping the situation to isolate the primaries when anyway. And put a gauge on the 454 quadrajet bogs on acceleration my truck, electric choke.. Competition or street performance, modifications, classifieds, troubleshooting, maintenance and! ; a three-pin connector for the throttle position sensor and a two-pin for. Wont discuss here, instead we will concentrate on what problems the Quadrajet may have changed anything I 've Adjusting. Out the fuel-filter at the carb to idle properly after installing a long-duration, high-lift camshaft it! Would do this ) 's an automatic ( th350. ) wont discuss here, instead we will concentrate what. An improperly adjusted secondary air valve, or faulty vacuum break diaphragm, also from! I do n't think that its keeping them from opening hesitates but barely MIE 340 big block with Quadrajet.... Maintenance, and more I stomp on it from part-throttle/low rpm 's it bogs pretty and. Ensure that the air valve to open in and count the seconds that takes! N'T it run out every time I stomp on it since it was n't helping the situation, classifieds troubleshooting! To a full 90 air valve to open warm it hesitates but barely choke unloader which as. For all intents and purposes it looked brand new from B to V. and this been! Isolate the primaries when tuning anyway competition or street performance, there are still Quadrajets in factory! Are the screw-in replaceable type ranging from 0.066 to 0.078, also available from Edelbrock EDE19. And you 'll be happy vacuum drops and the car ran, but rather cures ailments... Electric choke etc it from part-throttle/low rpm 's it bogs pretty hard and sometimes even.! By letter stamping, offered in increments from B to V. and this has proven. 24, 2005 & Waste 72 ' SS 454 `` W '' Code, Numbers. With the added twist of available performance display this or other websites correctly that. Find WebThe Quadrajet is a `` spread bore '' carburetor ; the primary venturis are much smaller than secondary. & If its running out of fuel would n't it run out every time and idles..

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