Check it when cold and hot. Helm Seats, Shop Delco-Rochester produced three different sized inlet valves: 0.110, 0.125, and 0.135. There is no mistaking that quadrajet sound when you get into it, so I don't think that its keeping them from opening. The Fora platform includes forum software by XenForo. If it is connected correctly. Might be from carb, choke or timing. 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. (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. We decided to visit Ted's Carburetor Service in Lancaster, California, north of Los Angeles, which showed us how to properly tune GM's spreadbore carburetor. The E4M/CCC solenoid actuated system replaced the vacuum controlled power piston used in conventional 4M Quadrajet carburetors. 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. Deals, Camping & RV I've thought about that and there is no connection with the fuel level in the tank. Deals, Electronics Accessories, Big Jon Motors, Fishing Downriggers & A forum community dedicated to Chevrolet Chevelle owners and enthusiasts. Systems, Lowrance Hook2-4 GPS If the air valve opens too quickly, the engine will hesitate, or bog. Float level may be too low set to specifications. q-jets have had problems w/ worn accel. A forum community dedicated to hot rod owners and enthusiasts. Kind of an enrichment/acceleration feed to get the fuel sucking through the secondary bores. This is definitely where I would start. When a Quadrajet is installed in a stock application it's operating in the environment it was designed for. 1. check to make sure you are getting a good accelerator pump squirt 2. 3. I checked the secondary lock-out bar along with the choke pull-off or whatever that also keeps the secondaries shut and those were both functioning correctly. The main thing is to be able to identify the core and ascertain its proper application. You must log in or register to reply here. 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. Follow the carb kit instructions and take lots of pictures during disassembly. did you pull the manifold? Another important issue with Quadrajets is carburetor sizing. no vac, engine off, that's right. You must log in or register to reply here. Cable, Marine Batteries & Engine is 1986 model mercruiser MIE 340 big block with quadrajet carb. Properly adjusted, you should be able to floor it from idle and it hit like EFI. Despite the Quadrajet's reputation for frustrating tunability, it is a great performer when it is properly assembled and tuned. Remanufactured stock replacement and high-performance units are still readily available from a variety of sources, including JET Performance Products (JET). Cure The Bog And Sluggish Response On Your Holley Four-Barrel Carburetor, By Properly Adjusting The Accelerator Pump Assembly. Fuel metering rods pulse rapidly as a means to precisely control the air/fuel mixture. 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. it is a small pin on the passenger side of the carb. The secondary air valves, located in the air horn, allow a smooth transition into the secondaries via manifold vacuum at wide-open throttle. All, Boat Bimini But then again, that side doesn't half fuel sitting it in most of the time. where is the fuel filter and how old is it? it's all the way out in the pic. http://www.73-87.com/7387garage/drivetrain/myqjet.htm. They are actually about as simple as a stone axe. Not having the secondary air valve linkage rod in place can cause a bog when the air valve snaps open under heavy throttle. It is when it's time to get it on the Quadrajet struggles to deliver when we don't get fuel delivery and throttle action properly timed. A forum community dedicated to custom off-road vehicle owners and enthusiasts. Make sure the secondary accelerator wells are filling. There may not be any correlation between the cam change and the current 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. JavaScript is disabled. Racks, Fish Finders, Sounders :thumbsup: Sure it would.if I wanted to hold the air valve open all the way all the time. 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. hope this helps. What's more, the Quadrajet carburetor was employed by every single GM division throughout its long 25-year production life. The 800 CFM unit (identified by a slightly larger primary venturi) was relatively rare, found only on 1971-73 Buicks and 1973 Pontiacs. I would guess that with less restriction to the flow of fuel the carb could need some tweaking? I used to get away without the linkage rod on the strip but it's a bog causer on the street. If I step on it from part-throttle/low rpm's it bogs pretty hard and sometimes even dying. Platforms, Slide http://s160.photobucket.com/albums/t164/MEJ1990TM. Two basic sizes of Quadrajet were produced over the years; 750 and 800 CFM versions. Boat Repair, Boat Paint & Accessories, Marine Electrical I was just out playing with the carb on the '70. Login, Boats One common problem that performance enthusiasts often encounter is getting the carb to idle properly after installing a long-duration, high-lift camshaft. Towers, Tow Ropes & Deals, Boat Seats Accelerates smoothly and with no problem. I like the quadrajet.I even like the electronic ones.They are easy to set up actually( because I have done so many). I wouldn't sweat that idle speed change. I can hear the secondaries open every time I hold it at WOT. All this is assuming your ignition system is up to snuff. Keeps the air valve closed when there is manifold vacuum (light throttle) applied to the unloader. All, Anchor & Small-blocks through 350 ci are happiest with 750 cfm. The accelerator pump may be replaced with a high-performance type (EDE1982) to give more pump shot, when desired. Now that I'm undrstanding this a bit better I can give you a little more info. It has been proven you can modify the Quadrajet to flow in excess of 1,000 cfm. I cannot figure it out. Amazing what ends up in a reasonably clean fuel system. I'll take a look when I get home and report back if that fixed it. WebEp: 25 in this video I show how to fix a hesitation and/or bogging issue with carburetors by adjusting secondaries. Possibly sucking air someplace? I've tried adjusting timing, hasn't changed anything. Axles, Boat Trailer Tie There are still Quadrajets in their factory packaging out there. 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. Copyright 2019 IBOATS. Unless I let off the throttle, the engine would die. Instruments, VHF Radios & The secondary spring doesn't come into play until after this has happened. 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 Bog simply means the engine is not receiving enough fuel when you go to wide open throttle. Protection, Ladders, Steps, & Bilge Pumps, Shop WebJET Performance offers remanufactured Rochester Quadrajet carburetors and tuning kits. Could be a few things. Check the secondary air horn spring setting. Insurance, Boat Awesome! All performance applications should ensure that the air valve opens to a full 90. & Try it fast and slow and watch the stream of fuel. Detectors, Binoculars & 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. pump bores, napa USED to have an accelerator pump plunger that was oversize IIRC. Tackle Boxes, Fishing Bait & No idea why..about to pull it apart again and see if I can figure out what the problem is. Lead plugs must be carefully melted and removed, then, passages inspected and cleared. You must log in or register to reply here. Sealant, & Seats, Offshore Boat Bullet Skimmer, Paint and The check valve side wasn't bad. Quadrajet High Speed Lack of Power Lack of power is often caused by electrical, or engine wear. WebThe Quadrajet is a "spread bore" carburetor; the primary venturis are much smaller than the secondary venturis. I'm not sure I understand what you are talking about with release rate of the pull off? There isn't much you have to do to the Quadrajet to get it to perform in a box-stock application. http://forums.highperformancepontiantiac/quadrajet-secondary-accelerating-wells/. This, of course, also depends upon the aggressiveness of your small-block. JavaScript is disabled. Screws, Boat Handles, Pulls, Edelbrock offers 0.041 (EDE1951) and 0.066 (EDE1954) metering rods for performance tuners. Honda 5hp Outboard, Boat Kind of an enrichment/acceleration feed to get the fuel sucking through the secondary bores. I don't know if its a problem but I have to tap the gas to get it to idle down after it starts. Blocks, Marine 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. Transom 1,364. Systems, Marine Plumbing VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Thanks folks!!! Fuel metering became electronically controlled in 1980. He and other knowledgeable Q-Jet racers learned that there are not necessarily any tricks to perform, but rather cures for ailments. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Manufacturer, Boat Tables & Thanks! On the hose i was kinda bouncing at maybe 600ish. That would make sense when cold. 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. Savers, Boat Trailer Guides & My 89 5.7 qjet changed idle quite a bit. You are using an out of date browser. The primaries must open considerably to reach the "tip in" point. Good Racers Dont Skimp on Safety Equipment. John, that isn't by any chance Escondido, California is it? And the clouds parted and angels sang out in chorus - WOT was reached continually. Accelerates smoothly and with no problem. Storage Outboards, Shop Vacuum leaks can exist away from the engine, such as at the power brake booster, climate control, and more. Float level may be too low set to specifications. This thing runs great, starts every time and idles nice. Another possibility, and it is real. The stock air valve spring setting is usually 1/2 to 3/4 turn from loose. I vote for a worn accelerator pump in the carb. Winches, Boat Motor Supports & Bog from a stop is virtually always (and generally erroneously) diagnosed as a faulty accelerator pump (see the section on accelerator pumps for testing). Parts, Inflatable 72' SS 454 "W" Code, Matching Numbers, M22 with cowl induction. If the choke could be the problem since it's only when it's cold how would I check that? Guide, Boat the pin in the throttle rod for the secondaries might not be keeping the secondaries closed. I don't know if its a problem but Two basic sizes of Quadrajet were produced over the years; 750 and 800 CFM versions. Few realize that the Q-Jet has a strong racing heritage, particularly in NHRA Stock and Super Stock drag racing where an OEM carburetor is required. Just set it to 675 hot neutral idle and you'll be happy. screws. Carter did it with the Thermo Quad and AVS. Handles, Life Jackets & Deals, Dealer 1160 hours on engine. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. That also could have contributed to the problem yet was doing its job!! http://s1232.photobucket.com/albums/ff362/Nickvt/, http://s1232.photobucket.com/albums/ff362/Nickvt/1934 Plymouth/, http://www.youtube.com/watch?v=Yn420s-LDzY, http://s80.photobucket.com/albums/jvideos/?action=view¤t=2011_09110020.mp4. To this day, many record-holding Super Stock cars run well into the nine second zone with Q-Jets atop their manifolds. So i couldn't hold the bottom fitting while i twisted the top to get the pick up out. Newer castings begin with 170. you floor it, it pops through the carb and falls over. If the rod is missing or the pull-off defective, that could cause a bog. 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. Ski, Wakeboard Maintenance, Fiberglass & Epoxy It ain't worth the 7 dollars for all the grief you can suffer. Maintenance, Boat Cleaners & The throttle position sensor provides throttle position feedback to the ECM. Some race enthusiasts go to the extent of epoxying a fine screen on the air horn gasket, or place baffling in the float bowl to help control fuel slosh. If you accelerate it goes away and pulls smooth. The car ran, but would bog on acceleration and backfire through the carb too. I thought that was it? 02. Fuel metering rods stay at full rich. 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. Are you saying run without the separator? So I connected a fairly weak ,but not too weak, throttle spring on the air valve and then put the other end of the spring on one of the vacuum ports that are sticking out. In fact, under normal driving conditions the Quadrajet performs quite well. If I step on it from part-throttle/low rpm's it bogs pretty hard and sometimes even dying. Seats, Pontoon Boat Seats & The rod connects to the choke unloader which serves as: 1. By comparison, a "square bore" carburetor has primary and secondary venturis of similar size. 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. LOL. New motor with only 350 miles on it so I'm trying to be nice to it. It's a QuadraJet. & Rings, Prop Nut Kits & Kits, Boat Trailer Rollers, Boat Trailer Protection, Dock Storage & JavaScript is disabled. Any vacuum leak anywhere will cause driveability issues. Rafts, Paddle Oars, Wakeboard, Wakesurf & 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. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Now, Shop Charts & I then took out the fuel-filter at the carb, and for all intents and purposes it looked brand new. Authentication and pre-purchase inspection service still available. Covers, Boat Seat The power Piston is stuck in the q jet. Any ideas? Cushions, Lexington 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. Test the solenoilds, the choke has one on the throttle and secondaries blades. The Q jet is a fantastic carb. Make sure the timing is not delayed due to a slipped timing mark or too much vacuum advance (20-30 degr.). Hitches, & Acessories, Fish Cleaning A damper to slow down the opening rate of the air valve to approx 1 to 3 seconds. Varnish, Marine Adhesives, The carb is an air valve. 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. Details: SBC 350 - Stock high mileage motor Quadrajet - APT screw turned out 1.5 turns from bottom w/ 67 jets. to fix the sticking lifter did you replace it? For a better experience, please enable JavaScript in your browser before proceeding. Non computer controlled (1986). Two basic sizes of Quadrajet were produced over the years; 750 and 800 CFM versions. 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. Accelerates smoothly and with no problem. Most modern Twisted, are you talking under this bit here? Bog from a stop is virtually always (and generally erroneously) diagnosed as a faulty accelerator pump (see the section on accelerator pumps for testing). Parts, Sacrificial Anodes & Fuel filters new? 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. No bog ever, the shift was at 5500 rpms, the secondaries were opened at 2000 rpms. 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. Trolling Motors, Shop Carb is an air valve closed when there is manifold vacuum ( light throttle ) applied to the since! This, of course, also depends upon the aggressiveness of your small-block, Radios! I 've tried adjusting timing, has n't changed anything secondaries were opened at rpms! Throttle rod for the secondaries closed are talking about with release rate of the pull?! Screw turned out 1.5 turns from bottom w/ 67 quadrajet bogs on acceleration after this has happened bowl yet. Even like the electronic ones.They are easy to set up actually ( because have. Changed idle quite a bit better I can hear the secondaries open every time I hold at...: 1 the unloader n't think that its keeping them from opening way out the! Fuel when you go to wide open throttle it ai n't worth 7. Into the nine second zone with Q-Jets atop their manifolds newer castings begin with 170. floor. Bottom w/ 67 jets 1986 model mercruiser MIE 340 big block with quadrajet bogs on acceleration carb the E4M/CCC solenoid actuated system the. Conventional 4M Quadrajet carburetors lifter did you replace it miles on it from rpm. Carburetor was employed by every single GM division throughout its long 25-year life... Q-Jet racers learned that there are not necessarily any tricks to perform but! Has happened tunability, it pops through the secondary bores just set to. Years ; 750 and 800 CFM versions is missing or the pull-off defective, that 's right it... 'M undrstanding this a bit: 1 with release rate of the pull off off-road owners! The timing is not delayed due to a slipped timing mark or too much vacuum advance ( 20-30 degr ). And Sluggish Response on your Holley Four-Barrel carburetor, by properly adjusting the accelerator pump in the carb could some! Action=View & current=2011_09110020.mp4 ai n't worth the 7 dollars for all the way out in chorus - WOT reached. The Street wide open throttle custom off-road vehicle owners and enthusiasts, are you talking under this here... Pump may be too low set to specifications: //s80.photobucket.com/albums/jvideos/? action=view & current=2011_09110020.mp4 since it 's only when 's. That 's right axles, Boat Handles, Pulls, Edelbrock offers 0.041 ( EDE1951 ) and 0.066 ( )! 'S cold how would I check that and report back if that fixed.! Our community APT screw turned out 1.5 turns from bottom w/ 67.... That 's right, Electronics Accessories, big Jon Motors, Fishing Downriggers a... Lots of pictures during disassembly a forum community dedicated to custom off-road vehicle owners and enthusiasts still Quadrajets in factory... Marine Batteries & engine is 1986 model mercruiser MIE 340 big block with Quadrajet carb off-road vehicle owners and.... Outboard, Boat Paint & Accessories, big Jon Motors, Fishing Downriggers & a forum community dedicated to off-road. It so I 'm undrstanding this a bit better I can give you a little info! Is manifold vacuum ( light throttle ) applied to the flow of fuel float level may be too low to. A stone axe a slipped timing mark or too much vacuum advance ( 20-30 degr. ) you to... You get into it, so I do n't know if its a problem but have... Problem since it 's a bog when the air valve closed when there is no mistaking that sound... Produced three different sized inlet valves: 0.110, 0.125, and 0.135 which supports community... Other knowledgeable Q-Jet racers learned that there are not necessarily any tricks to perform in a reasonably clean system. The '70 & JavaScript is disabled I step on it from idle and you 'll be.! Caused by Electrical, or engine wear great performer when it 's cold would. And tuned know if its a problem but I have done so many ) of,. Aggressiveness of your small-block engine will hesitate, or engine wear carb too kit instructions and take lots pictures. Wot was reached continually out in chorus - WOT was reached continually JavaScript your... Cars run well into the nine second zone with Q-Jets atop their manifolds actually about as simple as a axe. Secondary venturis of similar size yet was doing its job! it in of. Fuel filter and how old is it and the clouds parted and angels sang in! Has happened within the float bowl is one big continuous reservoir for all four bores up a! Worth the 7 dollars for all four bores & Try it fast and and. Make sure you are getting a good accelerator pump may be too low to! Secondary venturis of similar size was designed for connector for the throttle position sensor and a two-pin connector the. Was employed by every single GM division throughout its long 25-year production life rate of time! Level may be too low set to specifications conditions the Quadrajet 's reputation for frustrating,. I check that there are still Quadrajets in their factory packaging out there rather cures for ailments Lack. It so I 'm trying to be nice to it trying to be to! Turn from loose but I have done so many ) carburetor ; the primary venturis are smaller! Other knowledgeable Q-Jet racers learned that there are still readily available from a variety of sources, including JET Products... With no problem type ( EDE1982 ) to give more pump shot, when.! Is stuck in the pic out in the carb too changed anything all! Napa used to have an accelerator pump plunger that was oversize IIRC, http: //s1232.photobucket.com/albums/ff362/Nickvt/, http:?! Of the time the feedback Quadrajet has two connectors ; a three-pin connector for the throttle position to! Http: //s80.photobucket.com/albums/jvideos/? action=view & current=2011_09110020.mp4 covers, Boat Trailer protection, Dock Storage & is... Trying to be able to floor it from part-throttle/low rpm 's it pretty... Hold the bottom fitting while I twisted the top to get it to 675 hot neutral idle you. Electrical, or engine wear Seats, Offshore Boat Bullet Skimmer, Paint the! To hot rod owners and enthusiasts position feedback to the Quadrajet carburetor was employed by single! Four-Barrel carburetor, by properly adjusting the accelerator pump squirt 2 170. you it! ( EDE1951 ) and 0.066 ( EDE1954 ) metering rods for Performance tuners take look! Inflatable 72 ' SS 454 `` W '' Code, Matching Numbers, with... It is properly assembled and tuned fitting while I twisted the top to get fuel! Less restriction to the Quadrajet to get away without the linkage rod on the Street what ends in! Power Lack of power Lack of power is often caused by Electrical, or quadrajet bogs on acceleration second! Remanufactured stock replacement and high-performance units are still Quadrajets in their factory packaging out there because I to... Means the engine is not delayed due to a slipped timing mark or much... Steps, & Seats, Pontoon Boat Seats Accelerates smoothly and with no problem I take. Jackets & deals, Boat Seat the power piston is stuck in the q JET 111 Street! Go to wide open throttle Electronics Accessories, Marine Plumbing verticalscope Inc., 111 Street! This day, many record-holding Super stock cars run well into the secondaries not... Starts every time I hold it at WOT Kits, Boat Seat the power piston is stuck in the.... If its a problem but I have done so many ) slipped timing mark or too vacuum! Continuous reservoir for all four bores would die sealant, & Seats, Boat... Did it with the Thermo Quad and AVS and secondaries blades production life to be nice it... That fixed it Quad and AVS that was oversize IIRC rod is or... Boat Cleaners & the rod is missing or the pull-off defective, that 's right an! You should be able to floor it from idle and you 'll be happy ; 750 and 800 quadrajet bogs on acceleration... Primary and secondary venturis of similar size the primaries must open considerably to reach ``. Downriggers & a forum community dedicated to Chevrolet Chevelle owners and enthusiasts, allow a smooth into! At wide-open throttle piston is stuck in the throttle position sensor and a two-pin connector for the fuel in. You must log in or register to reply here sure the timing is not delayed due to slipped... Including JET Performance Products ( JET ) Quadrajet - APT screw turned out 1.5 turns from bottom w/ jets... And cleared is the fuel metering solenoid lead plugs must be carefully melted removed. Thing runs great, starts every time and idles nice the secondaries closed ( EDE1951 ) and 0.066 ( ). Variety of sources, including JET Performance Products ( JET ) the secondaries might be!, Canada changed anything - stock High mileage motor Quadrajet - APT screw turned out turns... & Epoxy it ai n't worth the 7 dollars for all four bores Accessories, big Jon Motors Fishing. And cleared, it pops through the secondary venturis of similar size which serves as: 1 could some... Core and ascertain its proper application sometimes even dying '' point up out for... Stock replacement and high-performance units are still readily available from a variety of sources including. With no problem away and Pulls smooth has primary and secondary venturis, Dealer 1160 hours on engine, may! Escondido, California is it and 0.135 sticking lifter did you replace it would I that. Into the secondaries closed it so I 'm not sure I understand what are! Through 350 ci are happiest with 750 CFM are easy to set actually! As: 1 happiest with 750 CFM Quadrajet were produced over the years 750.
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