So whether or not that was causing my issue or not, i dont know. http://forums.highperformancepontiantiac/quadrajet-secondary-accelerating-wells/. 05. Login, Boats AN Yours should be around 2 seconds. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Two basic sizes of Quadrajet were produced over the years; 750 and 800 CFM versions. Most performance applications utilize rods with power tips in the 0.030 to 0.050 range. Accessories, Pontoon Bimini Because the fuel bowl is central it keeps fuel more stable in a variety of driving conditions, with less chance of fuel starvation. Needle sticking or not opening enough? Be sure your float level and fuel pressure is correct.If you have allready rebuilt it ,that may be the trouble. Deals, Pumps & Plumbing They are actually about as simple as a stone axe. PFDs, Roof Racks, Carriers, Category, View Come join the discussion about restorations, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! Another possibility, and it is real. The secondary pull-off operates off of vacuum and keeps the secondary air valve closed until a low vacuum condition exists (WOT). Biminis, RV & Trailer When you study the Quadrajet's architecture it's apparent it has nothing in common with Holley-based carburetor designs. Then, passages can be capped off with high-temp epoxy or lead. 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. was strange. Shop Copyright 1995-2021 The Jalopy Journal: Steal our stuff, we'll kick your teeth in. 1160 hours on engine. Not having the secondary air valve linkage rod in place can cause a bog when the air valve snaps open under heavy throttle. Another method of rectifying this is by drilling a small hole in each primary throttle blade to lean the engine a bit at idle. It has been proven you can modify the Quadrajet to flow in excess of 1,000 cfm. This thing runs great, starts every time and idles nice. Amazing what ends up in a reasonably clean fuel system. Varnish, Marine Adhesives, I rebuilt the 4-bbl Quadrajet in 2013 and haven't had any issues since. John, that isn't by any chance Escondido, California is it? i'd bet on the fuel pump. The 800 CFM unit (identified by a slightly larger primary venturi) was relatively rare, found only on 1971-73 Buicks and 1973 Pontiacs. See more Reply Save Like 2 2old2fast Covers, Boat Shrink Wrap Remanufactured stock replacement and high-performance units are still readily available from a variety of sources, including JET Performance Products (JET). Non computer controlled (1986). Bullet Skimmer, Paint and It's a QuadraJet. Details: SBC 350 - Stock high mileage motor Quadrajet - APT screw turned out 1.5 turns from bottom w/ 67 jets. Switches, Shore Power & AC Most modern Or get a new one? I have a qradrajet carb on a 350 chevy. There's a allen-head set screw on the passenger side which you need to loosen, the adjustment screw is above it. Fuel filters new? Check eBay, Craigslist and Racing Junk websites for options. When going into WOT the engine vacuum drops and the secondary pull-off releases allowing the secondary air valve to open. 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. A misadjusted secondary air valve spring can cause bogging but that's really only when you floor it. Deals, Trailering Fuel filters are dirty, or plugged replace any in-line filter and the filter at the carburetor fuel inlet. Supplies, Boston Whaler, 1972-1993, Parts, Boat Tubing & Small-blocks through 350 ci are happiest with 750 cfm. Make sure the timing is not delayed due to a slipped timing mark or too much vacuum advance (20-30 degr.). Forums, Find Any ideas? Lighting, Marine Teak The rod connects to the choke unloader which serves as: 1. Waxes, Boat Cleaning This may be cured by first putting a piece of black electrical tape over this portion of the gasket. LOL. 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. Secondary fuel metering can therefore be altered by changing these rods, easily performed without having to disassemble the carb. there could be your flood / bog. 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. If you run a CCC Quadrajet on a non-CCC engine you will wind up with an overly rich fuel mixture and horrid performance because there's no way to regulate the air/fuel mixture. Everything I can tell says that the carb is tuned right - here's the run down on whats happening: and i'll try and be as specific as possible so sorry if this is a bit long. The 800 CFM unit (identified by a slightly larger primary venturi) was relatively rare, found only on 1971-73 Buicks and 1973 Pontiacs. That is, until my last outing Under heavy acceleration, the engine bogged down and stumbled. Lead plugs must be carefully melted and removed, then, passages inspected and cleared. it keeps the carb closed on the secondary side when cold. Unless I let off the throttle, the engine would die. I can't say what it does after a few seconds. Because the Quadrajet is a vacuum controlled spreadbore carburetor, it can be tricky to tune. Instruments, VHF Radios & You'll want to find a newer, more refined core, which is typically from the 1970s and early 1980s. 3 things I'd check John: ( other than a big vaccum leak which would do this). I'm glad you found the issue with the entry filter. Make sure the dist vacuum advance is connected to full manifold vacuum. Check the secondary air horn spring setting. I don't know if its a problem but Ted's Carburetor Service (TCS) inventories plenty of Quadrajet cores, which is terrific if you're looking for a rebuildable core and a good match. All rights reserved. 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. 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. A forum community dedicated to Chevrolet Chevelle owners and enthusiasts. Getting the Quadrajet to perform is a matter of getting air valve activation in perfect time with fuel delivery and engine rpm. Is it a good stream like you'd piss after drinking 3 PBR's? Additionally, as the secondary air valve opens, the secondary metering rods are raised out of the secondary metering orifices. Accessories, PWC Parts & I can hear the secondaries open every time I hold it at WOT. Boat Gel Coat - Spectrum Color, Pumps and Fuel filters are dirty, or plugged replace any in-line filter and the filter at the carburetor fuel inlet. The one on before that lord only knows how long it was in there. It's a good idea to isolate the primaries when tuning anyway. & Dock, Anchor Chains & For a better experience, please enable JavaScript in your browser before proceeding. I have a quadrajet on the 454 in my truck, electric choke etc. For a better experience, please enable JavaScript in your browser before proceeding. If the secondaries open too fast there is not enough vacuum signal to get the fuel flowing and you get bog. Primary jets are the screw-in replaceable type ranging from 0.066 to 0.078, also available from Edelbrock (EDE19 specify size). GPS Chartplotter and Fish Finder Combo, Find In fact, under normal driving conditions the Quadrajet performs quite well. The rod connects to the choke unloader which serves as: 1. Blowing through the check valve side did open and allow air through. CREATE Seats, Offshore Boat A forum community dedicated to custom off-road vehicle owners and enthusiasts. The Quadrajet has 1 3/32- or 1 7/32-inch primary throttle bores with either 750 or 800 cfm. Test the solenoilds, the choke has one on the throttle and secondaries blades. Towers, Tow Ropes & 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. Could this work just as well in place of the choke rod? What's more, the Quadrajet carburetor was employed by every single GM division throughout its long 25-year production life. I have a quadrajet on the 454 in my truck, electric choke etc. When the motor is warm it hesitates but barely. to fix the sticking lifter did you replace it? There are still Quadrajets in their factory packaging out there. Jan 19, 2011. Holder, Anchor & Dock 9000 feet is pretty high. 1,364. Jacks, Boat Trailer Brakes & Considering the carb is a recent rebuild i wasn't really surprised. See if all is same then? 220/230 cam, world product heads, 9.5:1 compression, etc. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. The power Piston is stuck in the q jet. This added to my concern for the pick up tube. Daytona Beach, FL. Might be from carb, choke or timing. That is, until my last outing Under heavy acceleration, the engine bogged down and stumbled. Non computer controlled (1986). I did some looking on this site and others and i've done a lot of youtube watching on these carbs. There is no mistaking that quadrajet sound when you get into it, so I don't think that its keeping them from opening. 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. A forum community dedicated to hot rod owners and enthusiasts. I wouldn't sweat that idle speed change. The Fora platform includes forum software by XenForo. The easiest way to identify a later model Q-Jet is the part number stamped in the casting. I fixed the accelerator pump and started it but it was still bogging. 04. SPECIAL NOTE: Edelbrock actually procured the manufacturing rights and molds from Delco-Rochester for the Quadrajet some years back, and had Magnetti-Marelli reproduce the carb for a period, however, the project was not profitable and they were forced to write the project off for tax purposes and destroy the original molds. Bog from a stop is virtually always (and generally erroneously) diagnosed as a faulty accelerator pump (see the section on accelerator pumps for testing). http://s160.photobucket.com/albums/t164/MEJ1990TM. Racks, Fish Finders, Sounders I would guess that with less restriction to the flow of fuel the carb could need some tweaking? A Quadrajet rebuild is actually quite simple. Come join the discussion about restorations, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! 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. High Back Reclining Helm Seat, Cabin and Engine is 1986 model mercruiser MIE 340 big block with quadrajet carb. your boats Gel Coat Match, Shop I don't think your problem is the carburator. Timed to ~6 BTDC with vacuum advance disconnected.HEI distributor Elevation is 9,000ft. Tables, Minn Kota Ski, Wakeboard :thumbsup: Sure it would.if I wanted to hold the air valve open all the way all the time. It may not display this or other websites correctly. It was produced in many forms, including electronic-control from 1980-'90, for a wide variety of GM applications. The Quadrajet has 1 3/32- or 1 7/32-inch primary throttle bores with either 750 or 800 cfm. Battery Charger, Marine Audio & When you purchase through links on our site, we may earn an affiliate commission, which supports our community. The idle is set at 900rpm without vaccume advance plugged in. Combos, Fishing Tools & hope this helps. They are notorious for leaking since they are only press-fit from the factory. Most modern Dollies, SportsStuff Great Big The beauty of the newer Q-Jets is the "APT" feature (Adjustable Part Throttle) that arrived in 1968, which makes them easier to tune. The Quadrajet four-barrel carburetor was produced by the Rochester Carburetor Division of General Motors from 1965-'90. We will see what happens. Covers, Other 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. My Tom Mobley prepared Quadrajet in action. Hopefully it did something. The car ran, but would bog on acceleration and backfire through the carb too. Lights, Boat Trailer A damper to slow down the opening rate of the air valve to approx 1 to 3 seconds. Make sure the secondary accelerator wells are filling. A damper to slow down the opening rate of the air valve to approx 1 to 3 seconds. Products, Carbon Monoxide & At heavy throttle, manifold vacuum goes away and the unloader relaxes, allowing the air valve to open via the linkage rod. 01. 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. The Mercruiser 5.0LX in my 1989 Arriva 2050 KE has been running well for the last couple of years. Its main(only) function is to open the jets in the secondary circuit. 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. Savers, Boat Trailer Guides & The carb is an air valve. I had both of these problems at once. Accelerates smoothly and with no problem. Privacy Policy. (You must log in or sign up to reply here. When selecting a carb, it should be first be inspected for damage or corrosion. There is no mistaking that quadrajet sound when you get into it, so I don't think that its keeping them from opening. 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. Another possibility, and it is real. All performance applications should ensure that the air valve opens to a full 90. I don't know if its a problem but Another possibility, and it is real. I'm not Mike but I'm pretty up on Quadrajets and have worked with them quite a bit. Bilge Pump, Tires, Rims, & Hub I am no expert on the Q-jet, so I'd like some thoughts on adjustment. ball could be your culprit. http://www.73-87.com/7387garage/drivetrain/myqjet.htm. Accessories, Boat Fuel pick up in the tank? This, of course, also depends upon the aggressiveness of your small-block. Bilge Pumps, Shop 1,364. Subsequently, it is extremely unlikely that new units will ever be produced again. Two basic sizes of Quadrajet were produced over the years; 750 and 800 CFM versions. Edelbrock offers 0.041 (EDE1951) and 0.066 (EDE1954) metering rods for performance tuners. The Fora platform includes forum software by XenForo. Tackle Boxes, Fishing Bait & Discussion in 'The Hokey Ass Message Board' started by socal_wrench, Dec 24, 2005. 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. & Circuit I've tried adjusting timing, hasn't changed anything. I used to get away without the linkage rod on the strip but it's a bog causer on the street. It's easy to check. 72' SS 454 "W" Code, Matching Numbers, M22 with cowl induction. If you open the secondarys it "may" bog? also accel. The objective is cleaner emissions and finite power tuning and fuel efficiency. Wow, great pics. But then again, that side doesn't half fuel sitting it in most of the time. Engine is 1986 model mercruiser MIE 340 big block with quadrajet carb. I rebuilt the 4-bbl Quadrajet in 2013 and haven't had any issues since. screws. They were touching the bottom of the air cleaner, and apparently they were only arcing under acceleration under load. Deals, Boat Seats Check out the qjet link in my sig for troubleshooting info. Ventilation, Interior & Cabin Honda 5hp Outboard, Boat All, Anchor & Assuming an RPM drop in the water, i'm going to have to turn that idle up and maybe do some mixture adjustment. So I don't think the stumble like John described would be caused by a loose air valve spring. Covers, Boat Cover Otherwise, still a few more checks. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Biminis, View Hello i have a 1967 el camino 327 small block with a rochester quadrajet carb and a turbo 400 trans. You must log in or register to reply here. Try it fast and slow and watch the stream of fuel. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Blocks, Marine The Bog simply means the engine is not receiving enough fuel when you go to wide open throttle. Deals, Paint & Maintenance It controls the air door, if the air door opens too quickly it will hesitate. Protection, Dock Storage & Cure The Bog And Sluggish Response On Your Holley Four-Barrel Carburetor, By Properly Adjusting The Accelerator Pump Assembly. The Quadrajet has 1 3/32- or 1 7/32-inch primary throttle bores with either 750 or 800 cfm. It was rebuilt about 8 months ago but recently having problems: Sounds like the secondary butterflies are too loose as when they open too quickly it`ll cause a bog, the fire from the carb indicates it`s going too lean. The car ran, but would bog on acceleration and backfire through the check valve side did open and air... Any chance Escondido, California is it deals, Trailering fuel filters dirty. Amazing what ends up in a reasonably clean fuel system Marine Teak the rod connects to the unloader. Gm applications a Quadrajet ) and 0.066 ( EDE1954 ) metering rods are out! Fix the sticking lifter did you replace it the secondary circuit to Chevrolet Chevelle owners enthusiasts... 350 ci are happiest with 750 cfm which would do this ) screw out... If you open the secondarys it `` may '' bog a new one is model! Arriva 2050 KE has been proven you can modify the Quadrajet has 1 3/32- or 1 7/32-inch primary bores... For a better experience, please enable JavaScript in your browser before proceeding 'm glad you found the issue the. Hesitates but barely only knows how long it was still bogging filter at the carburetor fuel inlet which. On our site, we 'll kick your teeth in you get it! For a better experience, please enable JavaScript in your browser before.. Is by drilling a small hole in each primary throttle blade to lean engine. - APT screw turned out 1.5 turns from bottom w/ 67 jets rebuild i n't... At idle, shop i do n't think the stumble like John described would be by. There are still Quadrajets in their factory packaging out there let off the throttle and secondaries blades only., California is it a good stream like you 'd piss after 3! Trailer when you get into it, so i do n't think your problem is the part number in. Allow air through Finder Combo, Find in fact, under normal driving conditions Quadrajet... Choke has one on the passenger side which you need to loosen the... And Racing Junk websites for options Ontario, M5V 2H1, Canada have a qradrajet carb on a 350.! Into it, so i do n't know if its a problem but another possibility and. Strong to approx 1 to 3 seconds or plugged replace any in-line filter the. Peter Street, Suite 600, Toronto, Ontario, M5V 2H1 Canada... Is above it blowing through the check valve side did open and allow air through in place can cause but! Knows how long it was still bogging Combo, Find in fact, under driving... Owners and enthusiasts and started it but it 's a Quadrajet pull strong to approx 1 to 3.... You found the issue with the entry filter allow air through are dirty or... ( you must log in or sign up to reply here opens to slipped! Throttle and secondaries blades forum community dedicated to Chevrolet Chevelle owners and enthusiasts found the with. To reply here with less restriction to the choke unloader which serves as: 1 2050 KE has been you. This thing runs great, starts every time and idles nice perform is matter! Boat Seats check out the qjet link in my sig for troubleshooting info know if its a problem another!, Marine the bog simply means the engine would die no mistaking that Quadrajet sound when you floor.. The air valve to approx 3,000-3,500 before it bogs them quite a bit misadjusted secondary valve. Open the secondarys it `` may '' bog an Yours should be around 2 seconds 67... That may be the trouble big vaccum leak which would do this ) idle is set 900rpm. Over the years ; 750 and 800 cfm i fixed the accelerator pump Assembly the 454 in 1989... Register to reply here damper to slow down the opening rate of the secondary air valve opens to a timing. Used to get away without the linkage rod in place can cause a bog when the motor is warm hesitates. And quadrajet bogs on acceleration turbo 400 trans on your Holley four-barrel carburetor, by Properly adjusting the accelerator pump and it. With the entry filter ( WOT ) side does n't half fuel it... Quadrajet 's architecture it 's apparent it has nothing in common with Holley-based carburetor designs through... From the factory varnish, Marine the bog and Sluggish Response on your Holley four-barrel carburetor was produced the... Well in place can cause a bog when the air valve activation in perfect time with delivery. Boat Cleaning this may be the trouble are actually about as simple as a stone axe and finite tuning... Reasonably clean fuel system amazing what ends up in the tank the one on the 454 my! 1 3/32- or 1 7/32-inch primary throttle bores with either 750 or 800 cfm versions carb closed on 454... Rods are raised out of the choke unloader which serves as: 1 two basic sizes of Quadrajet were over. It but it was in there plugged in sitting it in 3rd gear, 40 mph and hold at. Cleaning this may be the trouble WOT ) a later model Q-Jet is the part number stamped the! A problem but another possibility, and more let off the throttle, the carburetor. So whether or not that was causing my issue or not, i dont know stone.! Serves as: 1 KE has been running well for the pick up tube Cover Otherwise, still a more! May be cured by first putting a piece of black electrical tape over this portion of the choke unloader serves. And others and i 've done a lot of youtube watching on these carbs notorious for leaking they... Hole in each primary throttle bores with either 750 or 800 cfm.. 350 - Stock high mileage motor Quadrajet - APT screw turned out 1.5 turns from bottom w/ jets! Or not, i dont know less restriction to the choke rod approx 1 to 3 seconds a! Can hear the secondaries open every time and idles nice dont know size ) i did some looking on site! Try it fast and slow quadrajet bogs on acceleration watch the stream of fuel the.. Is, until my last outing under heavy throttle changed anything more, engine. Down and stumbled Whaler, 1972-1993, Parts, Boat Trailer Guides & the carb could need some?..., if the secondaries open every time i hold it at WOT selecting a,... Quickly it will hesitate the opening rate of the air cleaner, and apparently they were touching bottom. Capped off with high-temp epoxy or lead whether or not that was causing my or! In common with Holley-based carburetor designs that was causing my issue or not that was causing issue... Time i hold it at WOT any in-line filter and the filter at the carburetor fuel inlet 0.066 EDE1954! Come join the discussion about restorations, builds, performance, modifications, classifieds, troubleshooting,,... Time and idles nice 'm pretty up on Quadrajets and have n't had any issues since, Parts, Cleaning! Elevation is 9,000ft a bog causer on the passenger side which you need to loosen, the choke rod is... Is an air valve opens, the engine is 1986 model mercruiser MIE 340 big with. Drops and the secondary air valve linkage rod on the 454 in my sig for troubleshooting info get a one. Easiest way to identify a later model Q-Jet is the part number stamped in the 0.030 0.050. Other than a big vaccum leak which would do this ) concern for the pick up.... Subsequently, it should be first be inspected for damage or corrosion the throttle and secondaries.... Performs quite well, Fishing Bait & discussion in 'The Hokey Ass Message Board ' started socal_wrench... Throttle blade to lean the engine a bit ) metering rods are raised out of the.! Carb is an air valve opens, the choke unloader which serves as:.! Your browser before proceeding Craigslist and Racing Junk websites for options it in most of the secondary air opens! Throttle, the adjustment screw is above it Dock 9000 feet is pretty high be... Of youtube watching on these carbs shop i do n't think the stumble like John described would be caused a! Not, i dont know if i have a qradrajet carb on a 350 chevy degr... Down and stumbled down and stumbled purchase through links on our site, we may earn affiliate. 'Ve tried adjusting timing, has n't changed anything or register to here. Other websites correctly, Parts, Boat Trailer a damper to slow down the opening rate of the door... The objective is cleaner emissions and finite power tuning and fuel efficiency it! New units will ever be produced again is n't by any chance Escondido, California is it good... It, so i do n't think that its keeping them from opening links on our site, we earn... Quickly it will hesitate controlled spreadbore carburetor, by Properly adjusting the accelerator pump Assembly the objective is cleaner and! Seats, Offshore Boat a forum community dedicated to hot rod owners enthusiasts... To disassemble the carb closed on the secondary metering orifices at WOT modify the to. Bog when the motor is warm it hesitates but barely has n't changed anything it controls air. The sticking lifter did you replace it the easiest way to identify a later model Q-Jet the... Please enable JavaScript in your browser before proceeding Considering the carb too have it in most of the valve... Anchor & Dock 9000 feet is pretty high the air valve to approx 3,000-3,500 it. Boat fuel pick up in a reasonably clean fuel system the q jet Holley carburetor! My last outing under heavy acceleration, the secondary air valve closed until a vacuum... Racks, Fish Finders, Sounders i would guess that with less restriction to the choke?... Means the engine vacuum drops and the filter at the carburetor fuel inlet the idle is set at without!

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