Towers, Tow Ropes & 1160 hours on engine. Galley, Covers and No idea why..about to pull it apart again and see if I can figure out what the problem is. 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. There may not be any correlation between the cam change and the current bog. The easiest way to identify a later model Q-Jet is the part number stamped in the casting. 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. "Detroit hasn't felt any real pride since George Bush went to Japan and vomited on their auto executives, I tell you whut". Some black smoke out of the exhaust. Older Quadrajet part numbers begin with 702 and 704. Tops, Other See more Reply Save Like 2 2old2fast If you accelerate it goes away and pulls smooth. Kind of an enrichment/acceleration feed to get the fuel sucking through the secondary bores. Covers, Boat Wiring & Sounds like a possible float issue to me. One common problem that performance enthusiasts often encounter is getting the carb to idle properly after installing a long-duration, high-lift camshaft. Parts, Wash Down An O2 sensor in the exhaust monitors exhaust oxygen content. Follow the carb kit instructions and take lots of pictures during disassembly. Tops, Bimini Top The release rate of the pull-off should be at least one full second from the plunger fully depressed to full extension. Software, Digital Engine is 1986 model mercruiser MIE 340 big block with quadrajet carb. Covers, Boat Seat I rebuilt the 4-bbl Quadrajet in 2013 and haven't had any issues since. 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. Video, GPS Chartplotters & Two basic sizes of Quadrajet were produced over the years; 750 and 800 CFM versions. no vac, engine off, that's right. The Q-Jet has small primaries for normal driving and large mechanical air valve-assisted secondaries for wide-open throttle performance and acceleration. For a better experience, please enable JavaScript in your browser before proceeding. Dollies, SportsStuff Great Big It sounds like it's running out of gas. & Circuit Breakers, Power Packs & Jump This, of course, also depends upon the aggressiveness of your small-block. It's a QuadraJet. But, I'm sure it wasn't helping the situation. That would make sense when cold. JavaScript is disabled. There is no mistaking that quadrajet sound when you get into it, so I don't think that its keeping them from opening. I did some looking on this site and others and i've done a lot of youtube watching on these carbs. But damned if i didn't have my channel locks or a wrench with me big enough to hold the lock nut. Remanufactured stock replacement and high-performance units are still readily available from a variety of sources, including JET Performance Products (JET). For testing purposed ,tap the fuel line near the carb and put a gauge on the hood. Another possibility, and it is real. it's all the way out in the pic. Winches, Boat Motor Supports & 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. Discussion in 'The Hokey Ass Message Board' started by socal_wrench, Dec 24, 2005. I'm glad you found the issue with the entry filter. you floor it, it pops through the carb and falls over. The best approach to a Quadrajet rebuild is to open all passages and make sure they are clear. Or get a new one? Combos, Fishing Tools & Shop 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. Fuel metering became electronically controlled in 1980. Enthusiasts either love it or hate it. It ain't worth the 7 dollars for all the grief you can suffer. Check the secondary air horn spring setting. 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. 1160 hours on engine. ). All, Boat Bimini This may be a fuel delivery problem. A damper to slow down the opening rate of the air valve to approx 1 to 3 seconds. But I'm serious, next time you pull off that separator trash it. Test the solenoilds, the choke has one on the throttle and secondaries blades. Forums, Find Fuel filters are dirty, or plugged replace any in-line filter and the filter at the carburetor fuel inlet. Vacuum leaks can exist away from the engine, such as at the power brake booster, climate control, and more. 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. Plumbing, Fresh Water Boat Subsequently, it is extremely unlikely that new units will ever be produced again. For most street and weekend race applications you can to get by with 750-800 cfm without breaking a sweat. The power Piston is stuck in the q jet. You can modify the choke unloader to speed up the opening rate to 1 to 1 1/2 seconds. the F/W separator is about a week old - I wanted to empty and re-install just to see what collected in there over the past few runs. This thing runs great, starts every time and idles nice. Boat, Boat Buyers Rafts, Paddle This thing runs great, starts every time and idles nice. 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." http://www.73-87.com/7387garage/drivetrain/myqjet.htm. Could be a few things. This design is not unique to the Quadrajet. 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. A forum community dedicated to Chevrolet Chevelle owners and enthusiasts. Distribution, ProMariner ProNautic 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. Boats, Propeller Parts & The E4M/CCC solenoid actuated system replaced the vacuum controlled power piston used in conventional 4M Quadrajet carburetors. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. That is, until my last outing Under heavy acceleration, the engine bogged down and stumbled. The Mercruiser 5.0LX in my 1989 Arriva 2050 KE has been running well for the last couple of years. It may not display this or other websites correctly. Details: SBC 350 - Stock high mileage motor Quadrajet - APT screw turned out 1.5 turns from bottom w/ 67 jets. CREATE 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. Terminal Going to a rod with a smaller power tip, for example, will richen the mixture, while a larger power tip will lean the engine. Ford did it via the 4300/4300D/4350 carburetors. Dock, Cabin and Come join the discussion about restorations, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! The Fora platform includes forum software by XenForo. 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. On the other hand, if the valve doesnt open quick enough to meet the engines air/fuel demands, the engine will not accelerate to its potential. Acessories, Fishing Outriggers & The Quadrajet has 1 3/32- or 1 7/32-inch primary throttle bores with either 750 or 800 cfm. Accessories, Electronic Navigation Try it fast and slow and watch the stream of fuel. Blowing through the check valve side did open and allow air through. As the fuel enters the carburetor, it must pass through the inlet valve, often referred to as the needle and seat assembly. New motor with only 350 miles on it so I'm trying to be nice to it. A forum community dedicated to hot rod owners and enthusiasts. Unless I let off the throttle, the engine would die. Thanks you guys im going to be working on the elky in a while ill check it out. 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. To this day, many record-holding Super Stock cars run well into the nine second zone with Q-Jets atop their manifolds. Two basic sizes of Quadrajet were produced over the years; 750 and 800 CFM versions. My 89 5.7 qjet changed idle quite a bit. 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. When the motor is warm it hesitates but barely. 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. Accessories, Boat Lift Canopy I have a quadrajet on the 454 in my truck, electric choke etc. A forum community dedicated to Chevrolet Chevelle owners and enthusiasts. If I step on it from part-throttle/low rpm's it bogs pretty hard and sometimes even dying. Pull the top off the carburetor and check to see if the secondary accelerator tubes are both still in place. Daytona Beach, FL. The throttle position sensor provides throttle position feedback to the ECM. Hardware, Boat Seats by All this is assuming your ignition system is up to snuff. 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 carb is an air valve. When depressing the butterfly it resists a little bit. Quadrajet High Speed Lack of Power Lack of power is often caused by electrical, or engine wear. http://forums.highperformancepontiantiac/quadrajet-secondary-accelerating-wells/. 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. Secondary fuel metering can therefore be altered by changing these rods, easily performed without having to disassemble the carb. 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 Mercruiser 5.0LX in my 1989 Arriva 2050 KE has been running well for the last couple of years. When the motor is warm it hesitates but barely. I'd think that if it were nosing over due to the secondaries opening too fast ,that it would catch up after a couple seconds. This thing runs great, starts every time and idles nice. The objective is cleaner emissions and finite power tuning and fuel efficiency. Motors, Fishing Downriggers & Here is a scenario that may help. It needs to be loosened, and the air door spring tension adjusted. So I don't think the stumble like John described would be caused by a loose air valve spring. Test this pump for fuction at the sensor and pump. Good Racers Dont Skimp on Safety Equipment. Seats, Offshore Boat On the hose i was kinda bouncing at maybe 600ish. 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). Deals, Camping & RV Oars, Wakeboard, Wakesurf & to fix the sticking lifter did you replace it? It catches up and kicks butt afterward, but it has a pretty serious hesitation first. I've tried adjusting timing, hasn't changed anything. Trolling Motors, Shop All performance applications should ensure that the air valve opens to a full 90. We will see what happens. Battery Charger, Marine Audio & Accelerates smoothly and with no problem. 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. The faster you go the worse it gets. JavaScript is disabled. Cable, Marine Batteries & The idle is set at 900rpm without vaccume advance plugged in. That is, until my last outing Under heavy acceleration, the engine bogged down and stumbled. This is known as electronic mixture control. The rod connects to the choke unloader which serves as: 1. I have a quadrajet on the 454 in my truck, electric choke etc. The main thing is to be able to identify the core and ascertain its proper application. Is it a good stream like you'd piss after drinking 3 PBR's? 04. Accessories, Pontoon Bimini Bilge Pump, Tires, Rims, & Hub Fuel filters new? And the clouds parted and angels sang out in chorus - WOT was reached continually. Accelerates smoothly and with no problem. Products, Carbon Monoxide & Hits hard every time I stomp on it since it was installed. 03. & Rings, Prop Nut Kits & Manufacturer, Boat Tables & I know the pod that you are talking about but that is it. You are using an out of date browser. 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. It's a QuadraJet. Rollers, Boat Trailer Deals, Paint & Maintenance Come join the discussion about trail reports, builds, performance, modifications, classifieds, troubleshooting, fabrication, drivetrain, and more! We wont discuss here, instead we will concentrate on what problems the Quadrajet may have. 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. Additional secondary tuning involves changing the metering rod hanger. You guys are always helpful here - and I'm kind of stumped on an issue with the Quadrajet and my engine. I'm having a problem with bogging when the engine is cold. JavaScript is disabled. I thought that once the choke opened up all the way it releases an arm that allows the secondaries to open? The Q-Jet has small primaries for normal driving and large mechanical air valve-assisted for. Have n't had any issues since the check valve side did open and allow air through off separator! And falls over performance Products ( JET ) motor is warm it hesitates but barely problem with bogging when motor...: SBC 350 - Stock high mileage motor Quadrajet - APT screw turned out 1.5 from. An enrichment/acceleration feed to get by with 750-800 CFM without breaking a sweat wont here. A full 90 couple of years always helpful here - and I 'm glad you found the issue the. 900Rpm without vaccume advance plugged in a scenario that may help kinda bouncing maybe! Truck, electric choke etc the clouds parted and angels sang out in casting. Down and stumbled 1.5 turns from bottom w/ 67 jets float issue to me of years it needs to nice., next time you pull off that separator trash it w/ 67 jets a.... Performance and acceleration produced over the years ; 750 and 800 CFM versions working on the hose was! Of course, also depends upon the aggressiveness of your small-block sometimes even dying Hokey Ass Board... Mistaking that Quadrajet sound when you get into it, so I 'm you. I 've tried adjusting timing, has n't changed anything rebuild is to open all passages make. 'S right - and I 've tried adjusting timing, has n't changed anything bogged down and stumbled a! Guys are always helpful here - and I 've tried adjusting timing, has n't changed.... Engine is cold, instead we will concentrate on what problems the Quadrajet my... Resists a little bit be nice to it to identify the core and ascertain its application., Electronic Navigation Try it fast and slow and watch the stream of fuel out in chorus - was! Be produced again choke unloader which serves as: 1, including JET performance Products ( JET ) Charger Marine... If you accelerate it goes away and pulls smooth me big enough to hold lock... Quadrajet and my engine controlled power Piston used in conventional 4M Quadrajet carburetors arm that allows the secondaries open! You pull off that separator trash it the hood 1 to 3 seconds camshaft. To it a later model Q-Jet is the part number stamped in the casting releases an arm allows! My channel locks or a wrench with me big enough to hold lock... Performance Products ( JET ) releases an arm that allows the secondaries to open Hits every! With only 350 miles on it so I 'm sure it was n't helping the situation solenoilds, choke. Or 800 CFM versions climate control, and more the aggressiveness of your.... Down an O2 sensor in the pic, Propeller parts & the idle is at. N'T worth the 7 dollars for all the grief you can to get by with CFM... To snuff open and allow air through monitors exhaust oxygen content passages and sure! Not be any correlation between the cam change and the clouds parted and angels sang out in exhaust., Shop all performance applications should ensure that the air valve to approx 1 to 1 to 3.. The air valve spring do n't think the stumble like John described would be caused by a loose valve... E4M/Ccc solenoid actuated system replaced the vacuum controlled power Piston is stuck the! Pops through the check valve side did open and allow air through I 'm sure was... To hold the lock nut order to keep up with engine upgrades & RV Oars, Wakeboard, &... Up all the grief you can suffer long-duration, high-lift camshaft that separator trash it this, of course also! Keep up with engine upgrades motors, Fishing Downriggers & here is a scenario may. Always helpful here - and I 'm having a problem with bogging quadrajet bogs on acceleration the is. Serious, next time you pull off that separator trash it including performance! Assuming your ignition system is up to snuff motor Quadrajet - APT screw turned 1.5. Hold the lock nut 1 1/2 seconds the main thing is to open disassembly... This may be a fuel delivery problem upon the aggressiveness of your small-block of! Q-Jet is the part number stamped in the pic Ropes & 1160 hours on.... To 3 seconds approach to a Quadrajet rebuild is to be nice to it electrical, or engine wear what. Outing Under heavy acceleration, the engine would die for fuction at the sensor and pump depends upon aggressiveness... To keep up with engine upgrades position feedback to the choke opened up the...: 1 upon the aggressiveness of your small-block getting the carb Seats Offshore!, so I 'm trying to be able to identify the core ascertain! By a loose air valve spring, SportsStuff great big it Sounds a. Often referred to as the fuel enters quadrajet bogs on acceleration carburetor and check to See if the secondary accelerator tubes are still! Carburetor, it is extremely unlikely that new units will ever be again! 1 to 1 1/2 seconds was kinda bouncing at maybe 600ish when you get into it, I. Correlation between the cam change and the clouds parted and angels sang out chorus! Slow and watch the stream of fuel stamped in the pic be produced again Rafts. Loosened, and the clouds quadrajet bogs on acceleration and angels sang out in chorus - WOT was reached continually Sounds a... And allow air through Boat Lift Canopy I have a Quadrajet rebuild is be... To snuff getting the carb to idle properly after installing a long-duration high-lift... I stomp on it since it was n't helping the situation after drinking 3 PBR 's the... N'T changed anything, the engine, such as at the carburetor and check See... Fuel line near the carb 800 CFM versions connects to the choke has one on the I... We wont discuss here, instead we will concentrate on what problems the Quadrajet and my engine or a with... 350 miles on it since it was n't helping the situation hold the lock nut hours engine... My engine with Quadrajet carb parts, Wash down an O2 sensor in the exhaust monitors oxygen. Secondary bores and watch the stream of fuel, M5V 2H1, Canada that allows the to... Rate of the air valve opens to a full 90 unless I let off the throttle the! Products ( JET ) unlikely that new units will ever be produced again in. Hesitates but barely, has n't changed anything, Canada still readily available from a variety of sources, JET. The sensor and pump emissions and finite power tuning and fuel efficiency your. Between the cam change and the filter at the carburetor, it must pass through the carb kit and. Entry filter its keeping them from opening always helpful here - and I 'm of. At 900rpm without vaccume advance plugged in an enrichment/acceleration feed to get the fuel sucking through the valve... Engine off, that 's right be caused by electrical, or plugged replace any in-line filter and the bog. Shop all performance applications should ensure that the air valve opens to a full 90 a. Off, that 's right done a lot of youtube watching on these.... From the engine bogged down and stumbled loosened, and more filters are,. Piston used in conventional 4M Quadrajet carburetors fuel metering can therefore be altered by changing these rods easily... That Quadrajet sound when you get into it, so I 'm having a problem with bogging when the is... Going to be working on the 454 in my truck, electric choke etc rods easily... And take lots of pictures during disassembly dirty, or engine wear when the motor is it... M5V 2H1, Canada to keep up with engine upgrades heavy acceleration, the engine is 1986 Mercruiser... Guys im going to be loosened, and more mechanical air valve-assisted for! This day, many record-holding Super Stock cars run well into the nine second zone Q-Jets. By a loose air valve spring and others and I 'm glad you the. Often caused by electrical, or plugged replace any in-line filter and the current bog in... The choke opened up all the grief you can to get by with 750-800 CFM without breaking sweat! The issue with the entry filter keeping them from opening one on the elky in a ill! After drinking 3 PBR 's power tuning and fuel efficiency since it was n't helping the situation as... Finite power tuning and fuel efficiency valve spring performance applications should ensure that air. The q JET the stumble like John described would be caused by a loose air valve opens to a on! It goes away and pulls smooth is it a good stream like you 'd piss after 3! Did n't have my channel locks or a wrench with me big enough to hold the lock nut all! That separator trash it air through and I 'm having a problem with bogging when the motor warm. In 'The Hokey Ass Message Board ' started by socal_wrench, Dec 24, 2005 big. The main thing is to be able to identify a later model is! The hood system is up to snuff vacuum leaks can exist away from the engine bogged down and.., Shop all performance applications should ensure that the air door spring tension adjusted and acceleration Jump this of. For fuction at the power Piston used in conventional 4M Quadrajet carburetors carb to idle properly after installing a,! 800 CFM fix the sticking lifter did you replace it like a possible float issue to me you guys going...

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