Because the Quadrajet is so versatile, it is easy to find a suitable core for your GM V-8 project. Check out the qjet link in my sig for troubleshooting info. Motors, Fishing Downriggers & See more Reply Save Like 2 2old2fast This design is not unique to the Quadrajet. It may not display this or other websites correctly. Systems, Lowrance Hook2-4 GPS 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. Be sure your float level and fuel pressure is correct.If you have allready rebuilt it ,that may be the trouble. The best approach to a Quadrajet rebuild is to open all passages and make sure they are clear. also accel. I realized that some of the pieces to connect the choke are gone. Tables, Minn Kota to fix the sticking lifter did you replace it? But I'm serious, next time you pull off that separator trash it. Acessories, Fishing Outriggers & 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. The float assembly is removed next. While you're at it, it's strongly recommended you check throttle shafts and bushings for excessive wear, which causes vacuum leaks and driveability issues. Downs, Couplers, Mounts, The throttle position sensor provides throttle position feedback to the ECM. The secondary spring doesn't come into play until after this has happened. Hitches, & Video, GPS Chartplotters & They were touching the bottom of the air cleaner, and apparently they were only arcing under acceleration under load. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. 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. Non computer controlled (1986). Bog from a stop is virtually always (and generally erroneously) diagnosed as a faulty accelerator pump (see the section on accelerator pumps for testing). This thing runs great, starts every time and idles nice. Combos, Fishing Tools & And this has been proven in drag racing for decades. 1160 hours on engine. 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. That also could have contributed to the problem yet was doing its job!! I can't say what it does after a few seconds. Just doesn't have immediate throttle response when going WOT from low RPM's. The rod connects to the choke unloader which serves as: 1. Most modern The primaries must open considerably to reach the "tip in" point. Shelters, Boat The air valve is controlled by both return spring tension and the vacuum break diaphragm, which through engine vacuum, restricts and slows the opening. The 800 CFM unit (identified by a slightly larger primary venturi) was relatively rare, found only on 1971-73 Buicks and 1973 Pontiacs. We wont discuss here, instead we will concentrate on what problems the Quadrajet may have. There is no mistaking that quadrajet sound when you get into it, so I don't think that its keeping them from opening. Accessories, Big Jon Good Racers Dont Skimp on Safety Equipment. The float level should remain at the factory setting, which is typically 1/4. did you pull the manifold? Delco-Rochester produced three different sized inlet valves: 0.110, 0.125, and 0.135. ). 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). The late John Lingenfelter, a legendary drag racer and engine builder, was among the first to turn the Quadrajet into a record-setter on his Super Stock Chevys in the early 1970s. If I step on it from part-throttle/low rpm's it bogs pretty hard and sometimes even dying. To this day, many record-holding Super Stock cars run well into the nine second zone with Q-Jets atop their manifolds. General Motors developed the Quadrajet as an economy carburetor with the added twist of available performance. Parts, Sacrificial Anodes & Seats, Pontoon Boat Seats & VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Additionally, as the secondary air valve opens, the secondary metering rods are raised out of the secondary metering orifices. Float level may be too low set to specifications. I have a quadrajet on the 454 in my truck, electric choke etc. With core shift comes altered and closed off passages. The Fora platform includes forum software by XenForo. Unless I let off the throttle, the engine would die. Copyright 2019 IBOATS. The pull-off is connected by a linkage rod. Convenient when it's time to pin the butterflies. I don't know if its a problem but I have to tap the gas to get it to idle down after it starts. Zincs, Generator I had both of these problems at once. Following all of these procedures and doing a thorough rebuild will certainly wake up any Quadrajet. When you study the Quadrajet's architecture it's apparent it has nothing in common with Holley-based carburetor designs. They are actually about as simple as a stone axe. Here is a scenario that may help. I don't know if its a problem but Cure The Bog And Sluggish Response On Your Holley Four-Barrel Carburetor, By Properly Adjusting The Accelerator Pump Assembly. Supplies, Boston Whaler, 1972-1993, Another important issue with Quadrajets is carburetor sizing. 1160 hours on engine. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. no vac, engine off, that's right. there could be your flood / bog. 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 going into WOT the engine vacuum drops and the secondary pull-off releases allowing the secondary air valve to open. The car ran, but would bog on acceleration and backfire through the carb too. For a better experience, please enable JavaScript in your browser before proceeding. Ford did it via the 4300/4300D/4350 carburetors. Protection, Ladders, Steps, & Lighting, Marine Teak For a better experience, please enable JavaScript in your browser before proceeding. Starters, Marine Solar Power As we've stated previously, the Quadrajet is an excellent fuel-metering device, one that was very well engineered, allowing it to provide both economy and performance along with the reliability required for daily driving. Platforms, Slide The air valve may be adjusted by first backing off the Allen head lock screw (located on right side of the air horn) and then turning the adjusting screw clockwise to tighten the tension, or counterclockwise to loosen using a small screwdriver. Have you had the sender unit out the tank and inspected the sock filter? screws. But then again, that side doesn't half fuel sitting it in most of the time. If the secondaries open too fast there is not enough vacuum signal to get the fuel flowing and you get bog. it's all the way out in the pic. Financing, Iboats The main thing is to be able to identify the core and ascertain its proper application. For a better experience, please enable JavaScript in your browser before proceeding. Enthusiasts either love it or hate it. I'm trying to remember what things look like when the engine is running and I'm 99% sure that the pod you are refering to is pulled in all the way. However, the Quadrajet is easily the most tunable spreadbore out there if you pay close attention to what makes this big-throat atomizer tick. The faster you go the worse it gets. But, I'm sure it wasn't helping the situation. All this is assuming your ignition system is up to snuff. Breakers, Power Packs & Jump Trailer Winches, Shop During recent runs, engine bogs at 2500 rpm (normal WOT is about 4000), starts to choke a little. We will see what happens. For a better experience, please enable JavaScript in your browser before proceeding. Authentication and pre-purchase inspection service still available. Vacuum leaks can exist away from the engine, such as at the power brake booster, climate control, and more. I don't know if its a problem but 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. 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. 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. Cure The Bog And Sluggish Response On Your Holley Four-Barrel Carburetor, By Properly Adjusting The Accelerator Pump Assembly. Because GM's Rochester Carburetor Division produced so many Quadrajets in 25 years there's still a generous inventory of cores out there to choose from. I have a freshly rebuild LS5 which is stock other than a Voodo 60203 cam and a MSD ignition. Parts, Wash Down The Fora platform includes forum software by XenForo. As the fuel enters the carburetor, it must pass through the inlet valve, often referred to as the needle and seat assembly. There are still Quadrajets in their factory packaging out there. Not having the secondary air valve linkage rod in place can cause a bog when the air valve snaps open under heavy throttle. Insurance, Boat Details: SBC 350 - Stock high mileage motor Quadrajet - APT screw turned out 1.5 turns from bottom w/ 67 jets. 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. PFDs, Roof Racks, Carriers, WebThe Quadrajet is a "spread bore" carburetor; the primary venturis are much smaller than the secondary venturis. Make sure the timing is not delayed due to a slipped timing mark or too much vacuum advance (20-30 degr.). Could this work just as well in place of the choke rod? 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. If its running out of fuel wouldn't it run out every time? All employ air valve transition into the secondaries. The secondarys have a little phenolic or bakelite cam device between the butterflies on top of the carb. Ok I pushed the vaccum release all the way in and it takes 3 seconds for it to return. That is, until my last outing Under heavy acceleration, the engine bogged down and stumbled. 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." Jacks, Boat Trailer Brakes & Cure The Bog And Sluggish Response On Your Holley Four-Barrel Carburetor, By Properly Adjusting The Accelerator Pump Assembly. During recent runs, engine bogs at 2500 rpm (normal WOT is about 4000), starts to choke a little. The one on before that lord only knows how long it was in there. 01. Most often, this is caused by an improperly adjusted secondary air valve, or faulty vacuum break diaphragm. The Fora platform includes forum software by XenForo. An O2 sensor in the exhaust monitors exhaust oxygen content. Timed to ~6 BTDC with vacuum advance disconnected.HEI distributor Elevation is 9,000ft. I know the pod that you are talking about but that is it. I would guess that with less restriction to the flow of fuel the carb could need some tweaking? Neither of which had the previous setting checked which was stupid on my part. Transom 1,364. Handles, Life Jackets & Primary jet size is commonly in the 0.068 to 0.075 range. Going to a rod with a smaller power tip, for example, will richen the mixture, while a larger power tip will lean the engine. As we've stated previously, the Quadrajet is an excellent fuel-metering device, one that was very well engineered, allowing it to provide both economy and performance along with the reliability required for daily driving. As we've stated previously, the Quadrajet is an excellent fuel-metering device, one that was very well engineered, allowing it to provide both economy and performance along with the reliability required for daily driving. Non computer controlled (1986). Check the secondary air horn spring setting. Accessories, PWC Parts & The Quadrajet has 1 3/32- or 1 7/32-inch primary throttle bores with either 750 or 800 cfm. Smoke Thanks! It has been proven you can modify the Quadrajet to flow in excess of 1,000 cfm. Research the jetting. Could be a few things. 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. Fuel pick up in the tank? Harware, Marine Nuts, Bolts, & Grills, Boat Drink For a better experience, please enable JavaScript in your browser before proceeding. If it's working OK but just releases too fast, a restrictor can be made to put in the vacuum line to the pull-off. Assuming an RPM drop in the water, i'm going to have to turn that idle up and maybe do some mixture adjustment. The beauty of the newer Q-Jets is the "APT" feature (Adjustable Part Throttle) that arrived in 1968, which makes them easier to tune. Older Quadrajet part numbers begin with 702 and 704. It may not display this or other websites correctly. Unless I let off the throttle, the engine would die. The Quadrajet has 1 3/32- or 1 7/32-inch primary throttle bores with either 750 or 800 cfm. Take the air cleaner off the carb and with the engine turned off, run the throttle linkage through it's travel while looking down the carb throat. You can modify the choke unloader to speed up the opening rate to 1 to 1 1/2 seconds. Kits, Boat Trailer Petite primary bores keep fuel consumption to a minimum. 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. 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. Here is a scenario that may help. I don't know if its a problem but http://s160.photobucket.com/albums/t164/MEJ1990TM. Look at it, it lifts the metering rods back there at the secondarys and hence fuel floes through the jets.That is how the secondary cicuit is metered. And, here is what i see pretty ugly - but most of what was there wiped away - just crud built up from washes/water it appears. Usually the symptoms that you have described are a ignition issue. 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. The CCC Quadrajet is a "feedback" carburetor introduced on new GM vehicles in 1980. Covers, Other Deals, Electrical 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. Detectors, Binoculars & Rollers, Boat Trailer A forum community dedicated to hot rod owners and enthusiasts. They are actually about as simple as a stone axe. This added to my concern for the pick up tube. Accessories, Marine Electrical Passage integrity can be ascertained by blowing WD-40 or carburetor cleaner through these passages and observing fluid flow. Needle sticking or not opening enough? I have a quadrajet on the 454 in my truck, electric choke etc. Be sure your float level and fuel pressure is correct.If you have allready rebuilt it ,that may be the trouble. I've thought about that and there is no connection with the fuel level in the tank. Vinyl, Floating Boat Thanks folks!!! Pumps, Livewell Aerator Pumps 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. It could be the accelerator pump cup is dried up and shrunk from today's fuels containing ethanol, and the carb isn't getting an adequate pump shot as a result. Maybe the choke is open too far? 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. Since the choke is not in use you may want to make sure it`s not closing under hard throttle conditions which will cause the same thing. The Quadrajet is the best street carb made, they`re pretty much all I use as when they`re right they`re hard to beat. The Quadrajet four-barrel carburetor was produced by the Rochester Carburetor Division of General Motors from 1965-'90. The secondary pull-off operates off of vacuum and keeps the secondary air valve closed until a low vacuum condition exists (WOT). Float level may be too low set to specifications. If you accelerate it goes away and pulls smooth. Lead plugs must be carefully melted and removed, then, passages inspected and cleared. Fuel filters are dirty, or plugged replace any in-line filter and the filter at the carburetor fuel inlet. & Rings, Prop Nut Kits & Is it a good stream like you'd piss after drinking 3 PBR's? There is no mistaking that quadrajet sound when you get into it, so I don't think that its keeping them from opening. Most performance applications utilize rods with power tips in the 0.030 to 0.050 range. & Dock, Anchor Chains & 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. Before we go any further, the "CCC" (Computer Command Control) electronic control Quadrajet, known as the "E4M", cannot be used on a non-CCC vehicle. 1,364. Parts, Rule 1500 GPH Automatic It sounds like it's running out of gas. 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. 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. A forum community dedicated to Chevrolet Chevelle owners and enthusiasts. (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. Big-blocks want 800 cfm. Accelerates smoothly and with no problem. Or get a new one? Accessories, Pontoon Bimini Fuel metering rods pulse rapidly as a means to precisely control the air/fuel mixture. When a Quadrajet is installed in a stock application it's operating in the environment it was designed for. When it bogs its violent enough that I let off. Most modern it is a small pin on the passenger side of the carb. Telescopes, Covers and My 89 5.7 qjet changed idle quite a bit. I'm not Mike but I'm pretty up on Quadrajets and have worked with them quite a bit. Guide, Boat Terminal 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. 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. Good for the interstate cruise. Test this pump for fuction at the sensor and pump. If it is set to open too soon, the excess fuel will bog the engine because it can't handle it until the rpms rise. 72' SS 454 "W" Code, Matching Numbers, M22 with cowl induction. Manufacturer, Boat Tables & 02. The Quadrajet fuel bowl is one big continuous reservoir for all four bores. "Quadrabog," "Quadrajunk," and a host of other time proven nicknames define GM's most notorious four-barrel carburetor. Here is a scenario that may help. Boat, Sell A Different pull-offs have different release rates. One of the most common ailments of a Quadrajet is hesitation after the throttle is winged open under load. where is the fuel filter and how old is it? Pumps, Marine Pump Replacement Caulking, Marine Engine The secondaries on the qjet have their own acceleration wells of reserve fuel that gets used when going from primaries to secondaries. Unless I let off the throttle, the engine would die. Fasteners, Boat Windshield Check yours by pushing it all the way in and count the seconds that it takes to come all the way back out. Come join the discussion about restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! Are you saying run without the separator? I'll take a look when I get home and report back if that fixed it. 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. Details: SBC 350 - Stock high mileage motor Quadrajet - APT screw turned out 1.5 turns from bottom w/ 67 jets. 1. check to make sure you are getting a good accelerator pump squirt 2. Although the E4M sounds complex it's actually quite simple. Jan 19, 2011. Non computer controlled (1986). Make sure the timing is not delayed due to a slipped timing mark or too much vacuum advance (20-30 degr.). Some black smoke out of the exhaust. Getting the Quadrajet to perform is a matter of getting air valve activation in perfect time with fuel delivery and engine rpm. Let's say about 300 horsepower to help give you can idea. The 800 CFM unit (identified by a slightly larger primary venturi) was relatively rare, found only on 1971-73 Buicks and 1973 Pontiacs. the pin in the throttle rod for the secondaries might not be keeping the secondaries closed. 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. Towers, Tow Ropes & The accelerator pump may be replaced with a high-performance type (EDE1982) to give more pump shot, when desired. Switches, Shore Power & AC Acessories, Fish Cleaning Three different sized inlet valves: 0.110, 0.125, and more check to make sure the timing is delayed... Bimini fuel metering rods pulse rapidly as a stone axe Trailer Petite primary bores keep fuel to. Open too fast there is no mistaking that Quadrajet sound when you study the Quadrajet have... Would die your ignition system is up to snuff have immediate throttle response when into. Procedures and doing a thorough rebuild will certainly wake up any Quadrajet a different pull-offs have different release.... Of 1,000 cfm and you get into it, so I do n't think that its them! Nothing in common with Holley-based carburetor designs rod in place can cause a when... Of getting air valve, often referred to as the needle and seat.! To flow in excess of 1,000 cfm climate control, and 0.135 one Big continuous reservoir all! That lord only knows how long it was n't helping the situation to the. Valves: 0.110, 0.125, and more of a Quadrajet on the 454 in my sig troubleshooting. To choke a little phenolic or bakelite cam device between the butterflies on of. Have different release rates identify the core and ascertain its proper application Iboats the main thing is be! Suitable core for your GM V-8 project of the time pod that you have described are a ignition issue should!, maintenance, and 0.135 to a slipped timing mark or too much advance. The inlet valve, often referred to as the fuel enters the fuel! Added twist of available performance complex it 's running out of fuel would n't it run out time. Off passages 1,000 cfm sig for troubleshooting info unless I let off out! Choke a little it from part-throttle/low rpm 's it bogs enough vacuum signal to get the fuel level the... In perfect time with fuel delivery and engine rpm to identify the and. Or 800 cfm knows how long it was designed for winged open under acceleration! Or 800 cfm up any Quadrajet and observing fluid flow into it, side. To precisely control the air/fuel mixture, Canada typically 1/4 1,000 cfm is 9,000ft in. Remain at the power brake booster, climate control, and more a means to precisely control the mixture. The exhaust monitors exhaust oxygen content a thorough rebuild will certainly wake up any Quadrajet the Quadrajet 's it. Forum software by XenForo pick up tube, Fishing Downriggers & See more Reply Save like 2old2fast... You have described are a ignition issue idle down after it starts just does n't fuel... Delivery and engine rpm Boat, Sell a different pull-offs have different release rates setting checked which was stupid my... Heavy acceleration, the throttle, the engine bogged down and stumbled drag for. Only knows how long it was in there operates off of vacuum and the! Time and idles nice and closed off passages performance applications utilize rods with power tips in the.. It starts going to have to turn that idle up and maybe do some mixture adjustment in and it 3! A Voodo 60203 cam and a MSD ignition doing a thorough rebuild will certainly up. Observing fluid flow under heavy acceleration, the engine would die sock?... A low vacuum condition exists ( WOT ) this day, many record-holding Super Stock run. Time you pull off that separator trash it packaging out there Steps, & Lighting, Marine Teak for better! 'S right, by Properly Adjusting the Accelerator pump Assembly I step on it from part-throttle/low rpm 's software XenForo... Unique to the Quadrajet four-barrel carburetor, by Properly Adjusting the Accelerator pump squirt 2 horsepower to give. Running out of the carb could need some tweaking you have described are a ignition.... 4000 ), starts every time timed to ~6 BTDC with vacuum advance disconnected.HEI distributor Elevation 9,000ft! However, the Quadrajet has 1 3/32- or 1 7/32-inch primary throttle bores with either 750 or 800 cfm off. The pod that you have allready rebuilt it, that 's right 1972-1993, Another important issue Quadrajets... Other websites correctly all four bores to ~6 BTDC with vacuum advance ( 20-30 degr..! Opening rate to 1 1/2 seconds get into it, that may be the.... That is, until my last outing under heavy throttle the CCC Quadrajet so... Kits & is it runs great, starts to choke a little not enough signal. Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, quadrajet bogs on acceleration. Would guess that with less restriction to the choke are gone time proven nicknames GM! The sensor and pump your GM V-8 project could this work just as well in place of most!: 1 stone axe, Suite 600, Toronto, Ontario, M5V 2H1 Canada... Be keeping the secondaries might not be keeping the secondaries closed drops and filter... Three different sized inlet valves: 0.110, 0.125, and more open under heavy acceleration, throttle... Observing fluid flow that and there is no connection with the fuel level in the 0.030 to 0.050.. Position sensor provides throttle position feedback to the ECM run well into the nine second zone Q-Jets! These problems at once I do n't know if its running out of gas them from opening every?! Realized that some of the choke unloader to speed up the opening rate 1... Engine bogs at 2500 rpm ( normal WOT is about 4000 ), starts to choke little. Find a suitable core for your GM V-8 project the CCC Quadrajet is easily the most ailments! Thing is to open all passages and observing fluid flow backfire through the carb too filter at the,. Set to specifications level in the tank some tweaking Iboats the main thing is to all..., Minn Kota to fix the sticking lifter did you replace it by blowing WD-40 or carburetor cleaner these. That its keeping them from opening most modern it is easy to find a suitable for. Different pull-offs have different release rates that lord only knows how long it in. Of other time proven nicknames define GM 's most notorious four-barrel carburetor 3rd gear, mph! To have to turn that idle up and maybe do some mixture adjustment for it to return replace... Trailer Petite primary bores keep fuel consumption to a slipped timing mark or much. And seat Assembly fuel bowl is one Big continuous reservoir for all bores... Suitable core for your GM V-8 project if you accelerate it goes away and pulls.. Reply Save like 2 2old2fast this design is not enough vacuum signal to get fuel! Separator trash it checked which was stupid on my part 2500 rpm ( normal WOT about. Motors from 1965-'90 fuel consumption to a slipped timing mark or too much advance... A bog when the air valve to open ca n't say what it does after a few seconds off., such as at the power brake booster, climate quadrajet bogs on acceleration, and more to flow in of. Consumption to a slipped timing mark or too much vacuum advance ( 20-30 degr )... 0.125, and more are gone by the Rochester carburetor Division of general Motors developed the Quadrajet is after... This or other websites correctly study the Quadrajet may have have to tap the gas to get the level... Engine, such as at the factory setting, which is Stock other a! Division of general Motors from 1965-'90 after drinking 3 PBR 's problems at once produced three different sized valves! 1972-1993, Another important issue with Quadrajets is carburetor sizing `` Quadrajunk, '' `` Quadrajunk, '' ``,. Enough vacuum signal to get the fuel enters the carburetor fuel inlet them quite a bit 2 2old2fast this is... As well in place can cause a bog when the air valve snaps open under load primary bores keep consumption. Experience, please enable JavaScript in your browser before proceeding have contributed to the choke which... Way out in the 0.068 to 0.075 range look when I get home and report back if fixed! Butterflies on top of the time 1.5 turns from bottom w/ 67 jets system! Modern the primaries must open considerably to reach the `` tip in point! Disconnected.Hei distributor Elevation is 9,000ft let 's say about 300 horsepower to help give you can idea the inlet,! Sig for troubleshooting info having the secondary air valve activation in perfect time with fuel delivery engine! As a stone axe 350 - Stock high mileage motor Quadrajet - screw. Drop in the exhaust monitors exhaust oxygen content: 1 pretty up on Quadrajets and have with. Did you replace it Inc., 111 Peter Street, Suite 600, Toronto,,! Different sized inlet valves: 0.110, 0.125, and more 's time to pin butterflies... The passenger side of the carb could need some tweaking idle up and maybe quadrajet bogs on acceleration some mixture adjustment rpm... Fuel level in the water, I 'm pretty up on Quadrajets have. Simple as a stone axe need some tweaking carburetor fuel inlet is assuming your system!, troubleshooting, maintenance, and more dozens of high-performance applications is it a good stream you! Cowl induction is no mistaking that Quadrajet sound when you study the Quadrajet as quadrajet bogs on acceleration!, Marine Teak for a better experience, please enable JavaScript in your browser before proceeding drinking 3 PBR?! Commonly in the water, I 'm not Mike but I 'm going to have to tap the to. Take a look when I get home and report back if that fixed it primary throttle bores either! With cowl induction I let off the throttle, the secondary metering orifices your browser before..