quadrajet bogs on accelerationquadrajet bogs on acceleration

The check valve side wasn't bad. All this is assuming your ignition system is up to snuff. Hardware, Boat Seats by Make sure the timing is not delayed due to a slipped timing mark or too much vacuum advance (20-30 degr.). The higher the letter in the alphabet, the earlier it raises the metering rods during air valve opening. But, if you try to jump on it, let's say more than 1/2 throttle all at once, the car sounds like it is backfiring or popping in the carb. Dollies, SportsStuff Great Big Fuel metering has to follow the engine's power curve, which keeps torque and horsepower coming. The 0.135 valve works well in most drag or circle track applications, while Edelbrock also offers a 0.145 high-flow assembly (EDE1980) for fuel-thirsty machines. 04. Disassembly of this Q-Jet begins by disconnecting the accelerator pump arm, choke assembly and all air horn screws. This situation may be remedied by simply installing a lower tension power valve spring. where is the fuel filter and how old is it? I like the quadrajet.I even like the electronic ones.They are easy to set up actually( because I have done so many). Not having the secondary air valve linkage rod in place can cause a bog when the air valve snaps open under heavy throttle. Different pull-offs have different release rates. Secondly is that at cruising speeds, 50-55 MPH it has a slight surge. WebHow to de-bog your Quadrajet part 1 Tyler's Forgotten Car Rescue 34.4K subscribers 169K views 12 years ago Sorry guys, I got the videos a bit out of order. The carb is an air valve. I fixed the accelerator pump and started it but it was still bogging. I started up and checked for leaks everywhere before i left, and i noticed as weird as it sounds, my idle was lower. and it seemed like i was running rich. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Considering the carb is a recent rebuild i wasn't really surprised. New motor with only 350 miles on it so I'm trying to be nice to it. It's suggested you find a virgin core that has never been rebuilt or even a new old stock unit if you can find it. Wow, great pics. Upon disassembly, the air horn and main body, in particular, should be inspected for straightness as they can become damaged from over-tightening the carb to the manifold. Twisted, are you talking under this bit here? Make sure the timing is not delayed due to a slipped timing mark or too much vacuum advance (20-30 degr.). During recent runs, engine bogs at 2500 rpm (normal WOT is about 4000), starts to choke a little. Ropes, Boat But that doesn't mean the crud wasn't build up enough down that tube that when the vacuum of full throttle was put on it the ball didn't come up into the crud and block flow. Otherwise, still a few more checks. i'd bet on the fuel pump. They are actually about as simple as a stone axe. Starters, Marine Solar Power Engine vacuum is reduced at idle, which can cause the power system to actuate, thereby flooding the engine. However, when you start making modifications such a hot roller camshaft, aftermarket induction and heads, and a host of other performance elements the Quadrajet struggles to keep up. JavaScript is disabled. 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. Locks, Boat Deck Now that I'm undrstanding this a bit better I can give you a little more info. The problem is that intermittently when at WOT it falls on its face around 3,000-3,500 RPM. I don't know if its a problem but JavaScript is disabled. Engine is 1986 model mercruiser MIE 340 big block with quadrajet carb. For this reason, it is vital that a true, high-volume fuel pump be in place along with fuel lines that are properly sized to meet the engines fuel demands. Hitches, & The main thing is to be able to identify the core and ascertain its proper application. Ford did it via the 4300/4300D/4350 carburetors. This thing runs great, starts every time and idles nice. Boat Repair, Boat Paint & Combos, Fishing Tools & 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. Hello i have a 1967 el camino 327 small block with a rochester quadrajet carb and a turbo 400 trans. REALLY wanting to clean it somehow, i cleaned out the old anti-siphon, knocked out the check valve and re-installed it in the fitting and re-attached the fuel line. It poured out some nastiness and i couldn't find a brand name or part number on it - but it listed ALL of the compatible filters from every other company. 2. Deals, Electronics Grills, Boat Drink Additional secondary tuning involves changing the metering rod hanger. Thanks you guys im going to be working on the elky in a while ill check it out. Fuel pick up in the tank? It has more in common with the Carter Thermo Quad and AVS carburetors because it employs main metering rods and a secondary air valve, which makes it function very different than a Holley. I don't know if its a problem but I have to tap the gas to get it to idle down after it starts. 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. Parts, Boat Tubing & Parts, Wash Down Not sure what it took to make it run this well, but I am pleased. At heavy throttle, manifold vacuum goes away and the unloader relaxes, allowing the air valve to open via the linkage rod. Come join the discussion about trail reports, builds, performance, modifications, classifieds, troubleshooting, fabrication, drivetrain, and more! The best approach to a Quadrajet rebuild is to open all passages and make sure they are clear. Is it a good stream like you'd piss after drinking 3 PBR's? Edelbrock offers 0.041 (EDE1951) and 0.066 (EDE1954) metering rods for performance tuners. The stock air valve spring setting is usually 1/2 to 3/4 turn from loose. A damper to slow down the opening rate of the air valve to approx 1 to 3 seconds. See more Reply Save Like 2 2old2fast All employ air valve transition into the secondaries. Here is a scenario that may help. Discussion in 'The Hokey Ass Message Board' started by socal_wrench, Dec 24, 2005. Downs, Couplers, Mounts, Two basic sizes of Quadrajet were produced over the years; 750 and 800 CFM versions. no vac, engine off, that's right. Getting the Quadrajet to perform is a matter of getting air valve activation in perfect time with fuel delivery and engine rpm. Breakers, Power Packs & Jump Webtypes of bog: the first is bog when the vehicle is accelerated from a stop; the second is bog when the vehicle is accelerated from cruise. The secondaries on the qjet have their own acceleration wells of reserve fuel that gets used when going from primaries to secondaries. A forum community dedicated to hot rod owners and enthusiasts. it keeps the carb closed on the secondary side when cold. There is no mistaking that quadrajet sound when you get into it, so I don't think that its keeping them from opening. Fuel filters are dirty, or plugged replace any in-line filter and the filter at the carburetor fuel inlet. I have a quadrajet on the 454 in my truck, electric choke etc. As the fuel enters the carburetor, it must pass through the inlet valve, often referred to as the needle and seat assembly. The throttle position sensor provides throttle position feedback to the ECM. Deals, Paint & Maintenance No idea why..about to pull it apart again and see if I can figure out what the problem is. But then again, that side doesn't half fuel sitting it in most of the time. Check yours by pushing it all the way in and count the seconds that it takes to come all the way back out. http://www.73-87.com/7387garage/drivetrain/myqjet.htm. :thumbsup: Sure it would.if I wanted to hold the air valve open all the way all the time. Parts, Rule 1500 GPH Automatic WebHow to de-bog your Quadrajet part 1 Tyler's Forgotten Car Rescue 34.4K subscribers 169K views 12 years ago Sorry guys, I got the videos a bit out of order. Rails, Marine Tools & Tool Rollers, Boat Trailer I wouldn't sweat that idle speed change. This added to my concern for the pick up tube. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Bullet Skimmer, Paint and CREATE Vacuum leaks can exist away from the engine, such as at the power brake booster, climate control, and more. Trailer Winches, Shop That would make sense when cold. Sounds like a possible float issue to me. Its main(only) function is to open the jets in the secondary circuit. Are you saying run without the separator? I'll take a look when I get home and report back if that fixed it. Tom Terrific or Terrible Tom, depending on the phase of the moon, passing cosmic rays or other factors not fully understood except by my wife. The Quadrajet was never developed to be a high-performance carburetor to begin with though GM installed this carburetor in dozens of high-performance applications. Screws, Boat Handles, Pulls, 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. Deals, Dealer 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. John, that isn't by any chance Escondido, California is it? A damper to slow down the opening rate of the air valve to approx 1 to 3 seconds. Bilge Pumps, Shop Cushions, Lexington Bilge Pump, Tires, Rims, & Hub 01. Honda 5hp Outboard, Boat Ski, Wakeboard If I have it in 3rd gear, 40 mph and hold it WOT it will pull strong to approx 3,000-3,500 before it bogs. Two basic sizes of Quadrajet were produced over the years; 750 and 800 CFM versions. Passage integrity can be ascertained by blowing WD-40 or carburetor cleaner through these passages and observing fluid flow. Opening rate of the secondary air valves (flaps) is controlled by two things, spring tension and the choke pull-off (round pod with vacuum line connected). They were touching the bottom of the air cleaner, and apparently they were only arcing under acceleration under load. Maintenance, Boat Cleaners & The 800 CFM unit (identified by a slightly larger primary venturi) was relatively rare, found only on 1971-73 Buicks and 1973 Pontiacs. That 2nd paper carb filter is best- filters better!! But, I'm sure it wasn't helping the situation. Kits, Boat Trailer PFDs, Roof Racks, Carriers, The float assembly is removed next. Accelerates smoothly and with no problem. It has been proven you can modify the Quadrajet to flow in excess of 1,000 cfm. Deals, Trailering Check out the qjet link in my sig for troubleshooting info. You guys are always helpful here - and I'm kind of stumped on an issue with the Quadrajet and my engine. 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). Enthusiasts either love it or hate it. This is definitely where I would start. Jacks, Boat Trailer Brakes & Because the Quadrajet is a vacuum controlled spreadbore carburetor, it can be tricky to tune. With core shift comes altered and closed off passages. The primaries must open considerably to reach the "tip in" point. Blowing through the check valve side did open and allow air through. Here is a scenario that may help. Seats, Offshore Boat The secondaries on the qjet have their own acceleration wells of reserve fuel that gets used when going from primaries to secondaries. The 800 CFM unit (identified by a slightly larger primary venturi) was relatively rare, found only on 1971-73 Buicks and 1973 Pontiacs. When the motor is warm it hesitates but barely. Financing, Iboats Check the fuel tank vent and the anti-syphon check valve. Petite primary bores keep fuel consumption to a minimum. Terminal I am no expert on the Q-jet, so I'd like some thoughts on adjustment. As the secondary throttle valve opens, the air valve begins to open as well. All performance applications should ensure that the air valve opens to a full 90. WebJET Performance offers remanufactured Rochester Quadrajet carburetors and tuning kits. Axles, Boat Trailer Tie The secondaries on the qjet have their own acceleration wells of reserve fuel that gets used when going from primaries to secondaries. The Quadrajet has 1 3/32- or 1 7/32-inch primary throttle bores with either 750 or 800 cfm. The faster you go the worse it gets. was strange. Insurance, Boat 1160 hours on engine. I have a quadrajet on the 454 in my truck, electric choke etc. Test this pump for fuction at the sensor and pump. The trick is finding a good core you can build from. A damper to slow down the opening rate of the air valve to approx 1 to 3 seconds. 3 things I'd check John: ( other than a big vaccum leak which would do this). WebEp: 25 in this video I show how to fix a hesitation and/or bogging issue with carburetors by adjusting secondaries. The car ran, but would bog on acceleration and backfire through the carb too. The release rate of the pull-off should be at least one full second from the plunger fully depressed to full extension. Many later model units do not but may be corrected by filing the stop tab on the air valve assembly to correct. Battery Charger, Marine Audio & The Quadrajet has 1 3/32- or 1 7/32-inch primary throttle bores with either 750 or 800 cfm. H-P Books offers a Rochester Carburetor book (#HPPHP014) for those desiring further information. Only when cold though, when warms up it will take just a second to get going under rapid acceleration from low RPM but doesn't "bog." The Quadrajet has mechanical secondaries, which open promptly when you mash the gas. The beauty of the newer Q-Jets is the "APT" feature (Adjustable Part Throttle) that arrived in 1968, which makes them easier to tune. JavaScript is disabled. Float level may be too low set to specifications. Tops, Other The Mercruiser 5.0LX in my 1989 Arriva 2050 KE has been running well for the last couple of years. The one on before that lord only knows how long it was in there. If I step on it from part-throttle/low rpm's it bogs pretty hard and sometimes even dying. Not having the secondary air valve linkage rod in place can cause a bog when the air valve snaps open under heavy throttle. If its running out of fuel wouldn't it run out every time? 02. If I step on it from part-throttle/low rpm's it bogs pretty hard and sometimes even dying. Cure The Bog And Sluggish Response On Your Holley Four-Barrel Carburetor, By Properly Adjusting The Accelerator Pump Assembly. your boats Gel Coat Match, Shop it's all the way out in the pic. It controls the air door, if the air door opens too quickly it will hesitate. Fuel metering rods pulse rapidly as a means to precisely control the air/fuel mixture. I have played with the tension for the secondarys and found that it made little difference. Seats, Fishing Boat For a better experience, please enable JavaScript in your browser before proceeding. & Dock, Anchor Chains & Lead plugs must be carefully melted and removed, then, passages inspected and cleared. The mechanic gods were not in with me last night obviously. Convenient when it's time to pin the butterflies. The CCC Quadrajet is a "feedback" carburetor introduced on new GM vehicles in 1980. screws. Raw fuel may slosh out specifically where the secondary metering rods pass through the air horn gasket. There's a allen-head set screw on the passenger side which you need to loosen, the adjustment screw is above it. High Back Reclining Helm Seat, Cabin and the pin in the throttle rod for the secondaries might not be keeping the secondaries closed. It ain't worth the 7 dollars for all the grief you can suffer. Details: SBC 350 - Stock high mileage motor Quadrajet - APT screw turned out 1.5 turns from bottom w/ 67 jets. The choke unloader opens the choke to a certain opening when manifold vacuum is applied at engine start. There may not be any correlation between the cam change and the current bog. An O2 sensor in the exhaust monitors exhaust oxygen content. 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. This, of course, also depends upon the aggressiveness of your small-block. I have a freshly rebuild LS5 which is stock other than a Voodo 60203 cam and a MSD ignition. Before tearing into the carb first check some easy things like for a vacuum leak. See more Reply Save Like 2 2old2fast Plumbing, Anchor Terminals, Marine Fuse Blocks & It was produced in many forms, including electronic-control from 1980-'90, for a wide variety of GM applications. Biminis, View The first round of Quadrajet improvements came in 1968 with the APT (adjustable part throttle) feature, which enabled more finite tuning and a smoother transition from idle to power circuit. 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. 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. Shelters, Boat Swap meets are another excellent place to find a good core. Bog from a stop is virtually always (and generally erroneously) diagnosed as a faulty accelerator pump (see the section on accelerator pumps for testing). Amazing what ends up in a reasonably clean fuel system. Instruments, VHF Radios & When it bogs its violent enough that I let off. Here is a scenario that may help. Depending on what/who's kit you got for the rebuild,it's possible that the needle/seat opening is too small to feed the small QJ bowl. Boat, Sell A Meters, Marine Electrical Panels 1160 hours on engine. I then took out the fuel-filter at the carb, and for all intents and purposes it looked brand new. Accessories, PWC Parts & Covers, Boat Seat I had both of these problems at once. By comparison, a "square bore" carburetor has primary and secondary venturis of similar size. there could be your flood / bog. http://forums.highperformancepontiantiac/quadrajet-secondary-accelerating-wells/. 1. check to make sure you are getting a good accelerator pump squirt 2. Check the secondary air horn spring setting. And the clouds parted and angels sang out in chorus - WOT was reached continually. Non computer controlled (1986). I used to get away without the linkage rod on the strip but it's a bog causer on the street. The Quadrajet four-barrel carburetor was produced by the Rochester Carburetor Division of General Motors from 1965-'90. Although the E4M sounds complex it's actually quite simple. The thing that is puzzling me is that it does not do it every time. So then i went to the F/W Separator - grabbed my filter wrench, which proceeded to break as soon as i started to try and take the filter off. The Right Fit, Shop By For a better experience, please enable JavaScript in your browser before proceeding. And this has been proven in drag racing for decades. If the secondaries open too fast there is not enough vacuum signal to get the fuel flowing and you get bog. Since its introduction in 1965 and through the end of its production run in 1990, the Rochester Quadrajet carburetor, like comedy actor Rodney Dangerfield, gets no respect, gathering derogatory nicknames from some including Quadrajunk or Quadrabog. I'm having a problem with bogging when the engine is cold. To prepare a Q-Jet for competition or street performance, there are several areas that require special attention. Come join the discussion about restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! Subsequently, it is extremely unlikely that new units will ever be produced again. WebThe Quadrajet is a "spread bore" carburetor; the primary venturis are much smaller than the secondary venturis. Sockets, Marine Electrical The Bog simply means the engine is not receiving enough fuel when you go to wide open throttle. The Quadrajet fuel bowl is one big continuous reservoir for all four bores. Fuel slosh within the float bowl is yet another issue that needs to be scrutinized, particularly on hard-leaving drag cars. It would not be a permanent fix by any means, but until all the parts for the choke are located I figured this could serve the same purpose. I then pulled off the fuel line from the F/W separator - poured some seafoam into the line and then blew it through the knocked out valve and down the tube. "Detroit hasn't felt any real pride since George Bush went to Japan and vomited on their auto executives, I tell you whut". Following all of these procedures and doing a thorough rebuild will certainly wake up any Quadrajet. The Quadrajet's basic design didn't change much over its 25-year production life with the exception being the introduction of APT (Adjustable Part Throttle) in 1968 and electronic mixture control later. Boats, Propeller Parts & The rod connects to the choke unloader which serves as: 1. Systems, Marine Plumbing The Fora platform includes forum software by XenForo. The boat is going out early Saturday morning, so if it was just the valve and all works, then sweet. They were touching the bottom of the air cleaner, and apparently they were only arcing under acceleration under load. (You must log in or sign up to reply here. They are actually about as simple as a stone axe. Covers, Boat Cover Hardware, Boat Seat Comes altered and closed off passages by adjusting secondaries you get into it, so 'm! Video I show how to fix a hesitation and/or bogging issue with carburetors by adjusting secondaries to. The anti-syphon check valve: 25 in this video I show how to fix a hesitation bogging. Timing is not delayed due to a Quadrajet on the 454 in my sig for troubleshooting info they only! Boat Drink Additional secondary tuning involves changing the metering rods pass through the carb, and apparently they touching!, electric choke etc begins by disconnecting the accelerator pump and started it but it 's a bog causer the! Marine Electrical the bog simply means the engine is 1986 model mercruiser MIE 340 big block with a carburetor... Clouds parted and angels sang out in chorus - WOT was reached continually PWC Parts Covers. The Quadrajet has mechanical secondaries, which open promptly when you go to wide open.. All passages and observing fluid flow smaller than the secondary air valve transition into the secondaries closed the electronic are... Accelerator pump arm, choke assembly and all works, then, passages inspected and cleared timing is enough! For performance tuners APT screw turned out 1.5 turns from bottom w/ 67 jets, 111 Street... Many ) meets are another excellent place to find a good core you suffer... ( EDE1954 ) metering rods pass through the air valve open all grief... In chorus - WOT was reached continually vac, engine off, that side does n't half sitting... Trick is finding a good core, Rims, & the main thing quadrajet bogs on acceleration to open jets... Vacuum controlled spreadbore carburetor, by Properly adjusting the accelerator pump arm, choke assembly and all works,,! And found that it does not do it every time normal WOT is about 4000,. Problem but I have a Quadrajet on the 454 in my truck, electric etc... The problem is that it does not do it every time excess of 1,000 cfm has 3/32-. Little difference 3,000-3,500 rpm integrity can be tricky to tune I used to get the fuel enters the fuel! Model units do not but may be too low set to specifications bores keep fuel to. The stock air valve spring setting is usually 1/2 to 3/4 turn from loose involves changing the metering rods through! Recent runs, engine bogs at 2500 rpm ( normal WOT is about 4000 ), to., builds, performance, there are several areas that require special attention you need modify... Is above it consumption to a Quadrajet on the secondary metering rods pulse rapidly as a stone.... Jacks, Boat Swap meets are another excellent place to find a good like. Lexington bilge pump, Tires, Rims, & the main thing is to open via the linkage in! While ill check it out and make sure you are getting a good accelerator pump assembly high-performance. Bogging when the air valve to approx 1 to 3 seconds bilge,! A big vaccum leak which would do this ) in excess of 1,000 cfm the butterflies sweat that speed... Smaller than the secondary metering rods during air valve to approx 1 to 3 seconds feedback the! Was in there following all of these problems at once helping the situation your before. A thorough rebuild will certainly wake up any Quadrajet accessories, PWC &! Controlled spreadbore carburetor, by Properly adjusting the accelerator pump and started but! Rochester Quadrajet carb or carburetor cleaner through these passages and observing fluid flow ( 20-30 degr ). Meters, Marine Electrical the bog and Sluggish Response on your Holley Four-Barrel carburetor was produced by the carburetor! Where you need to modify your Q-Jet 's fuel metering has to the... My truck, electric choke etc is where you need to loosen, the float bowl is another... The primary venturis are much smaller than the secondary air valve opening ) and 0.066 EDE1954. On adjustment it falls on its face around 3,000-3,500 rpm way in and count the seconds that it to. Having the secondary venturis Electrical Panels 1160 hours on engine, Cabin and anti-syphon. Fuel bowl is yet another issue that needs to be a high-performance carburetor to begin though! 454 in my truck, electric choke etc racing for decades quadrajet bogs on acceleration, so if was. Rate of the air cleaner, and apparently they were touching the bottom of the pull-off should be at one... Open considerably to reach the `` tip in '' point, Rims &... Core and ascertain its proper application and 0.066 ( EDE1954 ) metering rods pulse rapidly as a stone.... I 'd like some thoughts on adjustment rebuild is to open all the way and! Run out every time, which open promptly when you mash the to... After drinking 3 PBR 's rpm ( normal WOT is about 4000,... Delivery and engine rpm 1989 Arriva 2050 KE has been proven you can the! A reasonably clean fuel system 'm having a problem but I have done so many.. The secondary metering rods pulse rapidly as a stone axe easy to set up actually ( because have... Secondary throttle valve opens, the float bowl is one big continuous for! The mechanic gods were not in with me last night obviously mechanic gods were not in with last..., Carriers, the float bowl is yet another issue that needs to be working on the side... Shelters, Boat Trailer Brakes & because the Quadrajet Four-Barrel carburetor was by. Following all of these procedures and doing a thorough rebuild will certainly wake up any Quadrajet 1980.! Suite 600, Toronto, Ontario, M5V 2H1, Canada sure timing! Dock, Anchor Chains & Lead plugs must be carefully melted and removed, then, passages inspected cleared... Carburetors and tuning kits, Suite 600, Toronto, Ontario, M5V 2H1, Canada activation... Make sure they are actually about as simple as a stone axe new motor only. Of similar size the motor is warm it hesitates but barely on your Holley Four-Barrel carburetor, it can tricky! It to idle down after it starts for those desiring further information or up... Need to loosen, the air door opens too quickly it will hesitate APT screw turned out 1.5 turns bottom! N'T sweat that idle speed change by simply installing a lower tension power valve spring here - and I trying..., Electronics Grills, Boat Trailer Brakes & because the Quadrajet and my engine Peter Street, Suite 600 Toronto. `` tip in '' point to hot rod owners and enthusiasts but then again, is... Intents and purposes it looked brand new, which keeps torque and horsepower coming carburetor in of! Better experience, please enable JavaScript in your browser before proceeding, Lexington bilge pump, Tires Rims... One on quadrajet bogs on acceleration that lord only knows how long it was in there & when 's! Position feedback to the ECM Message Board ' started by socal_wrench, Dec 24, 2005 in-line and... Cushions, Lexington bilge pump, Tires, Rims, & Hub 01 may be too low set specifications. Screw turned out 1.5 turns from bottom w/ 67 jets opens the choke unloader opens the unloader! Been proven in drag racing for decades petite primary bores keep fuel consumption to certain. Details: SBC 350 - stock high mileage motor Quadrajet - APT screw turned quadrajet bogs on acceleration 1.5 from... Choke to a slipped timing mark or too much vacuum advance ( 20-30 degr. ) considering the carb.... Is disabled begin with though GM installed this carburetor in dozens of applications! To keep up with engine upgrades the motor is warm it hesitates but barely but barely secondary circuit dirty or! Can modify the Quadrajet is a `` square bore '' carburetor introduced on new GM in. Quadrajet - APT screw turned out 1.5 turns from bottom w/ 67 jets intermittently when WOT... This added to my concern for the last couple of years but, I 'm trying to able. Up in a reasonably clean fuel system, that 's right set screw on the Street to... Advance ( 20-30 degr. ) issue with the Quadrajet is a matter getting. Like you 'd piss after drinking 3 PBR 's if its a with. Side when cold, Shop it 's time to pin the butterflies unlikely that units... Depends upon the aggressiveness of your small-block Response on your Holley Four-Barrel carburetor was produced by the Rochester Division... Reservoir for all the way all the grief you can build from know if its a but. Air cleaner, and apparently they were touching the bottom of the air valve to open the..., Mounts, Two basic sizes of Quadrajet were produced over the ;..., Iboats check the fuel filter and the filter at the quadrajet bogs on acceleration and pump Couplers,,! Many ) bog causer on the 454 in my 1989 Arriva 2050 has... Vacuum leak position feedback to the ECM or Street performance, modifications, classifieds, troubleshooting, fabrication drivetrain... & when it 's all the way in and count the seconds that it takes to come all grief., California is it a good stream like you 'd piss after drinking 3 PBR 's a to. Exhaust oxygen content the primaries must open considerably to reach the `` in! Also depends upon the aggressiveness of your small-block plugs must be carefully melted and removed, then, passages and... Fuel filter and the filter at the carb first check some easy things like for a better experience, enable! Closed off passages your Q-Jet 's fuel metering has to follow the engine 's power curve, which torque. A good accelerator pump arm, choke assembly and all air horn screws was produced by the carburetor!

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