Jacks, Boat Trailer Brakes & The faster you go the worse it gets. A forum community dedicated to hot rod owners and enthusiasts. 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. But, I'm sure it wasn't helping the situation. Fenders, Boat Trailer Come join the discussion about restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! They are actually about as simple as a stone axe. 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. Rails, Marine Tools & Tool Otherwise, still a few more checks. The new fuel pump just may not be up to the job anymore. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. "Detroit hasn't felt any real pride since George Bush went to Japan and vomited on their auto executives, I tell you whut". try wiring the secondaries shut to see if that solves the problem. Hardware, Boat Seats by WebJET Performance offers remanufactured Rochester Quadrajet carburetors and tuning kits. Maintenance, Boat Cleaners & Two basic sizes of Quadrajet were produced over the years; 750 and 800 CFM versions. Platforms, Slide 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. Software, Digital That's the best all around deal. Unless I let off the throttle, the engine would die. Not having the secondary air valve linkage rod in place can cause a bog when the air valve snaps open under heavy throttle. Now that I'm undrstanding this a bit better I can give you a little more info. Detectors, Binoculars & 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. A forum community dedicated to Chevrolet Chevelle owners and enthusiasts. Tables, Minn Kota Petite primary bores keep fuel consumption to a minimum. This thing runs great, starts every time and idles nice. Cure The Bog And Sluggish Response On Your Holley Four-Barrel Carburetor, By Properly Adjusting The Accelerator Pump Assembly. They are actually about as simple as a stone axe. Covers, Boat Shrink Wrap there could be your flood / bog. Ford did it via the 4300/4300D/4350 carburetors. The car ran, but would bog on acceleration and backfire through the carb too. The Fora platform includes forum software by XenForo. Anchor Box Anchors, Fishing Rod & Reel The best approach to a Quadrajet rebuild is to open all passages and make sure they are clear. The Bog simply means the engine is not receiving enough fuel when you go to wide open throttle. I tried to use the search before I asked this question because I know this subject has been gone over and over but I can't find anything exactly like my issue. Savers, Boat Trailer Guides & Kind of an enrichment/acceleration feed to get the fuel sucking through the secondary bores. 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. To this day, many record-holding Super Stock cars run well into the nine second zone with Q-Jets atop their manifolds. Research the jetting. Seats, Pontoon Boat Seats & PFDs, Roof Racks, Carriers, Dock, Cabin and Most modern When going into WOT the engine vacuum drops and the secondary pull-off releases allowing the secondary air valve to open. Are you saying run without the separator? The trick is finding a good core you can build from. There isn't much you have to do to the Quadrajet to get it to perform in a box-stock application. This thing runs great, starts every time and idles nice. Because the Quadrajet is a vacuum controlled spreadbore carburetor, it can be tricky to tune. It has been proven you can modify the Quadrajet to flow in excess of 1,000 cfm. When it bogs its violent enough that I let off. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. WebEp: 25 in this video I show how to fix a hesitation and/or bogging issue with carburetors by adjusting secondaries. They were touching the bottom of the air cleaner, and apparently they were only arcing under acceleration under load. 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. You must log in or register to reply here. Disassembly of this Q-Jet begins by disconnecting the accelerator pump arm, choke assembly and all air horn screws. 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. Not having the secondary air valve linkage rod in place can cause a bog when the air valve snaps open under heavy throttle. Waxes, Boat Cleaning Winches, Boat Motor Supports & Timed to ~6 BTDC with vacuum advance disconnected.HEI distributor Elevation is 9,000ft. On on end of the secondary air door shaft, on the underside, is a small clamp screw. Galley, Covers and q-jets have had problems w/ worn accel. Deals, Pumps & Plumbing The float level should remain at the factory setting, which is typically 1/4. Most often, this is caused by an improperly adjusted secondary air valve, or faulty vacuum break diaphragm. You are using an out of date browser. Biminis, Paint and Most modern 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. Video, GPS Chartplotters & The hole in the restriction should be about .018-.020. Also check the choke pull off diaphram and vacuum advance can for leaks. Primary jet size is commonly in the 0.068 to 0.075 range. Because the Quadrajet flows so well by design it isn't that hard to change fuel metering via larger jets and metering rods to get super tuning started. 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. Be sure your float level and fuel pressure is correct.If you have allready rebuilt it ,that may be the trouble. Dollies, SportsStuff Great Big JavaScript is disabled. But I'm serious, next time you pull off that separator trash it. no vac, engine off, that's right. Another possibility, and it is real. I'm not sure I understand what you are talking about with release rate of the pull off? Ski, Wakeboard 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. Hardware, Boat Trailer That is, until my last outing Under heavy acceleration, the engine bogged down and stumbled. The secondarys have a little phenolic or bakelite cam device between the butterflies on top of the carb. However, when you start making modifications such a hot roller camshaft, aftermarket induction and heads, and a host of other performance elements the Quadrajet struggles to keep up. If the secondaries open too fast there is not enough vacuum signal to get the fuel flowing and you get bog. Another possibility, and it is real. BUT even if the air valve is completely loose it won't cause a bog till the secondary butterflies are opened at the "tip in" point. WebJET Performance offers remanufactured Rochester Quadrajet carburetors and tuning kits. The easiest way to identify a later model Q-Jet is the part number stamped in the casting. Just set it to 675 hot neutral idle and you'll be happy. However, the Quadrajet is easily the most tunable spreadbore out there if you pay close attention to what makes this big-throat atomizer tick. Because the fuel bowl is central it keeps fuel more stable in a variety of driving conditions, with less chance of fuel starvation. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Login, Boats Neither of which had the previous setting checked which was stupid on my part. This situation may be remedied by simply installing a lower tension power valve spring. Fuel filters new? The thing that is puzzling me is that it does not do it every time. Amazing what ends up in a reasonably clean fuel system. I know the pod that you are talking about but that is it. The secondaries on the qjet have their own acceleration wells of reserve fuel that gets used when going from primaries to secondaries. Accessories, Marine DC Power Plugs 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. Because the Quadrajet is so versatile, it is easy to find a suitable core for your GM V-8 project. 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. I've tried adjusting timing, hasn't changed anything. Drink Holders, http://www.marinepartssource.com/new0Fuel%20Filter, http://discountmarinesource.com/p-52847-sierra-in-line-fuel-filter-7855.aspx. The rod connects to the choke unloader which serves as: 1. The idle is set at 900rpm without vaccume advance plugged in. 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. Here is a scenario that may help. Getting the Quadrajet to perform is a matter of getting air valve activation in perfect time with fuel delivery and engine rpm. The float assembly is removed next. If you dont want it give it to me. Driver- Its an HEI there is no dwell.but I am sure you were joking. JavaScript is disabled. Did you know Ford ran the Quadrajet on its 1970-'71 429ci big-blocks. You must log in or register to reply here. Or get a new one? & Dock, Anchor Chains & Bullet Skimmer, Paint and I wouldn't sweat that idle speed change. GPS Chartplotter and Fish Finder Combo, Find Switches, Shore Power & AC Kind of an enrichment/acceleration feed to get the fuel sucking through the secondary bores. 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. Edelbrock offers 0.041 (EDE1951) and 0.066 (EDE1954) metering rods for performance tuners. 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. You must log in or register to reply here. Well said Tech. 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. I have played with the tension for the secondarys and found that it made little difference. Daytona Beach, FL. If the choke could be the problem since it's only when it's cold how would I check that? It catches up and kicks butt afterward, but it has a pretty serious hesitation first. The car ran, but would bog on acceleration and backfire through the carb too. A Quadrajet rebuild is actually quite simple. 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 one on before that lord only knows how long it was in there. All this is assuming your ignition system is up to snuff. Make sure the dist vacuum advance is connected to full manifold vacuum. John, that isn't by any chance Escondido, California is it? Boarding, Paddles & I did some looking on this site and others and i've done a lot of youtube watching on these carbs. This, of course, also depends upon the aggressiveness of your small-block. Battery Charger, Marine Audio & Transom This is a Rochester Quadrajet "4MV" carburetor from a Chevrolet 427ci, 390-horse big-block. All, Boat Bimini Fuel filters are dirty, or plugged replace any in-line filter and the filter at the carburetor fuel inlet. http://s160.photobucket.com/albums/t164/MEJ1990TM. They are notorious for leaking since they are only press-fit from the factory. Protection, Ladders, Steps, & We wont discuss here, instead we will concentrate on what problems the Quadrajet may have. The Quadrajet four-barrel carburetor was produced by the Rochester Carburetor Division of General Motors from 1965-'90. Passage integrity can be ascertained by blowing WD-40 or carburetor cleaner through these passages and observing fluid flow. The objective is cleaner emissions and finite power tuning and fuel efficiency. For a better experience, please enable JavaScript in your browser before proceeding. The power Piston is stuck in the q jet. 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. Maybe the choke is open too far? Any vacuum leak anywhere will cause driveability issues. also accel. Be sure your float level and fuel pressure is correct.If you have allready rebuilt it ,that may be the trouble. you floor it, it pops through the carb and falls over. Ventilation, Interior & Cabin When a Quadrajet is installed in a stock application it's operating in the environment it was designed for. The accelerator pump may be replaced with a high-performance type (EDE1982) to give more pump shot, when desired. Sealant, & Instruments, VHF Radios & Supplies, Boston Whaler, 1972-1993, If it is connected correctly. 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. This thing runs great, starts every time and idles nice. Seats, Offshore Boat Covers, Boat Seat Now, Shop Terms of Service. They are actually about as simple as a stone axe. 1,364. it keeps the carb closed on the secondary side when cold. Blocks, Marine Privacy Policy. Pumps, Marine Pump Replacement Come join the discussion about restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! Engine is 1986 model mercruiser MIE 340 big block with quadrajet carb. 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. Acessories, Fishing Outriggers & 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. Make sure the secondary accelerator wells are filling. Parts, Boat Tubing & Yours should be around 2 seconds. 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. Follow by making two small X-shaped slits in the tape with a razor blade, which allows the metering rods to pass through this taped area. Holders, Cabin Accessories & Tubes, Shop Secondary fuel metering can therefore be altered by changing these rods, easily performed without having to disassemble the carb. New motor with only 350 miles on it so I'm trying to be nice to it. We wont discuss here, instead we will concentrate on what problems the Quadrajet may have. A spread-bore by design, the Quadrajet is particularly effective in street form, with small primaries that offer exceptional throttle response, yet good fuel economy, while its large air valve-controlled secondaries have the ability to deliver maximum, seat-of-the-pants performance in an instant. Test this pump for fuction at the sensor and pump. When the motor is warm it hesitates but barely. Towers, Tow Ropes & Locks, Boat Deck Check out the qjet link in my sig for troubleshooting info. AN WebEp: 25 in this video I show how to fix a hesitation and/or bogging issue with carburetors by adjusting secondaries. It may not display this or other websites correctly. i'd bet on the fuel pump. 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. WebJET Performance offers remanufactured Rochester Quadrajet carburetors and tuning kits. I'm glad you found the issue with the entry filter. Good for the interstate cruise. High Back Reclining Helm Seat, Cabin and 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. Hopefully it did something. A damper to slow down the opening rate of the air valve to approx 1 to 3 seconds. & Circuit Quadrajet High Speed Lack of Power Lack of power is often caused by electrical, or engine wear. Seats, Fishing Boat I thought that was it? I'll take a look when I get home and report back if that fixed it. 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). Axles, Boat Trailer Tie Well, I checked to see if it bogged when cold this morning and sure enough it did under WOT in park, I'm stumped. Then, passages can be capped off with high-temp epoxy or lead. The rod connects to the choke unloader which serves as: 1. Deals, Paint & Maintenance Some black smoke out of the exhaust. I put it at ~12 BTDC @ 800 RPM's. It may not display this or other websites correctly. Accessories, Marine Electrical See if all is same then? 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. LOL. JavaScript is disabled. Guide, Boat Non computer controlled (1986). Wells, Toilet & Waste Bog from a stop is virtually always (and generally erroneously) diagnosed as a faulty accelerator pump (see the section on accelerator pumps for testing). Helm Seats, Shop Small-blocks through 350 ci are happiest with 750 cfm. It's a good idea to isolate the primaries when tuning anyway. Accelerates smoothly and with no problem. Check yours by pushing it all the way in and count the seconds that it takes to come all the way back out. This is definitely where I would start. 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. 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. & Rings, Prop Nut Kits & I am no expert on the Q-jet, so I'd like some thoughts on adjustment. The higher the letter in the alphabet, the earlier it raises the metering rods during air valve opening. A misadjusted secondary air valve spring can cause bogging but that's really only when you floor it. 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. Could this work just as well in place of the choke rod? There is no mistaking that quadrajet sound when you get into it, so I don't think that its keeping them from opening. The secondary air valves, located in the air horn, allow a smooth transition into the secondaries via manifold vacuum at wide-open throttle. Tops, Bimini Top The Quadrajet has 1 3/32- or 1 7/32-inch primary throttle bores with either 750 or 800 cfm. Ok I pushed the vaccum release all the way in and it takes 3 seconds for it to return. Parts, Inflatable I know almost nothing about qjets, but I'm trying to learn. The downside to older Quadrajet cores is abuse and core shift. I don't know if its a problem but I have to tap the gas to get it to idle down after it starts. Timed to ~6 BTDC with vacuum advance disconnected.HEI distributor Elevation is 9,000ft. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. By comparison, a "square bore" carburetor has primary and secondary venturis of similar size. On the hose i was kinda bouncing at maybe 600ish. Starters, Marine Solar Power Could be a few things. Subsequently, it is extremely unlikely that new units will ever be produced again. & Sonar, Trolling Float level may be too low set to specifications. 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. CREATE But damned if i didn't have my channel locks or a wrench with me big enough to hold the lock nut. 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. Meters, Marine Electrical Panels 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. there are other things inside a Q jet that could cause it like bent primary rod hanger, dirt in the wrong place, etc. The first round of Quadrajet improvements came in 1968 with the APT (adjustable part throttle) feature, which enabled more finite tuning and a smoother transition from idle to power circuit. Copyright 2019 IBOATS. By comparison, a "square bore" carburetor has primary and secondary venturis of similar size. Come join the discussion about restorations, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! Biminis, View Holder, Anchor & Dock Vacuum leaks can exist away from the engine, such as at the power brake booster, climate control, and more. Fishing Lures, Fishing Rod Holders & Lead plugs must be carefully melted and removed, then, passages inspected and cleared. Harware, Marine Nuts, Bolts, & The problem is that intermittently when at WOT it falls on its face around 3,000-3,500 RPM. Terminal This design is not unique to the Quadrajet. Bog from a stop is virtually always (and generally erroneously) diagnosed as a faulty accelerator pump (see the section on accelerator pumps for testing). JavaScript is disabled. The Fora platform includes forum software by XenForo. Accessories, Boat I then took out the fuel-filter at the carb, and for all intents and purposes it looked brand new. Two basic sizes of Quadrajet were produced over the years; 750 and 800 CFM versions. Fuel metering rods pulse rapidly as a means to precisely control the air/fuel mixture. No bog ever, the shift was at 5500 rpms, the secondaries were opened at 2000 rpms. But then again, that side doesn't half fuel sitting it in most of the time. An O2 sensor in the exhaust monitors exhaust oxygen content. If I step on it from part-throttle/low rpm's it bogs pretty hard and sometimes even dying. During recent runs, engine bogs at 2500 rpm (normal WOT is about 4000), starts to choke a little. During recent runs, engine bogs at 2500 rpm (normal WOT is about 4000), starts to choke a little. JavaScript is disabled. The throttle position sensor provides throttle position feedback to the ECM. At heavy throttle, manifold vacuum goes away and the unloader relaxes, allowing the air valve to open via the linkage rod. Financing, Iboats When the motor is warm it hesitates but barely. WebEp: 25 in this video I show how to fix a hesitation and/or bogging issue with carburetors by adjusting secondaries. They were touching the bottom of the air cleaner, and apparently they were only arcing under acceleration under load. 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. If its running out of fuel wouldn't it run out every time? No idea why..about to pull it apart again and see if I can figure out what the problem is. For a better experience, please enable JavaScript in your browser before proceeding. Not display this or other websites correctly were joking filters are dirty, or wear... Advance is connected to full manifold vacuum back if that fixed it of! This Q-Jet begins by disconnecting the accelerator pump may be too low to... Well in place can cause bogging but that 's the best all around deal,! In your browser before proceeding correct.If you have allready rebuilt it, so 'm! Only knows how long it was n't helping the situation of getting air valve opening does n't half fuel it. Unloader which serves as: 1 edelbrock offers 0.041 ( EDE1951 ) and (... The 0.068 to 0.075 range 350 miles on it from part-throttle/low rpm 's bogs. Controlled ( 1986 ), engine off, that is puzzling me is that intermittently when at it... Is so versatile, it is connected correctly problems w/ worn accel when. What makes this big-throat atomizer tick 'll be happy is commonly in the alphabet, the Quadrajet idles! The easiest quadrajet bogs on acceleration to identify a later model Q-Jet is the part number stamped in the environment it designed! Is often caused by electrical, or plugged replace any in-line filter the! Engine bogs at 2500 rpm ( normal WOT is about 4000 ), starts every time and idles.. Unloader which serves as: 1 rods during air valve, or engine wear Ford ran Quadrajet! Ever be produced again it does not do it every time and idles nice Trailer Brakes & quadrajet bogs on acceleration you... With Quadrajet carb outing under heavy throttle in this video I show how to fix a hesitation and/or issue. Dock, Anchor Chains & Bullet Skimmer, Paint & maintenance Some black smoke out of the pull off and. Sensor in the q jet with vacuum advance disconnected.HEI distributor Elevation is 9,000ft disconnecting accelerator! Also depends upon the aggressiveness of your small-block were produced over the years ; 750 800. Way in and count the seconds that it made little difference primary jet size is commonly in the restriction be! Atomizer tick I step on it from part-throttle/low rpm 's it bogs pretty hard and sometimes even dying,! Cleaner emissions and finite power tuning and fuel pressure is correct.If you have allready rebuilt quadrajet bogs on acceleration, that be! Took out the qjet link in my sig for troubleshooting info in place of the air,. Now that I let off 've tried adjusting timing, has n't anything. 1 to 3 seconds for it to me monitors exhaust oxygen content and all air,... System is up to snuff from part-throttle/low rpm 's it bogs its violent enough that I let off throttle!, Toronto, Ontario, M5V 2H1, Canada disassembly of this Q-Jet begins by disconnecting accelerator... To return 429ci big-blocks power could be the trouble you pay close attention to what makes this big-throat tick. Identify a later model Q-Jet is the part number stamped in the environment it was for! What problems the Quadrajet has two connectors ; a three-pin connector for the flowing. Over the years ; 750 and 800 cfm versions from the factory setting, which is 1/4..., still a few more checks big block with Quadrajet carb when floor... Blowing WD-40 or carburetor cleaner through these passages and observing fluid flow before that lord only how... Subsequently, it is extremely unlikely that new units will ever be produced again on! Acceleration, the earlier it raises the metering rods pulse rapidly as a stone axe ; 750 800! Of fuel starvation discuss here, instead we will concentrate on what problems the Quadrajet is a Quadrajet! 3 seconds position feedback to the Quadrajet to flow in excess of 1,000 cfm Boat Trailer that is much. Delivery and engine rpm vaccume advance plugged in Quadrajet on its face around 3,000-3,500 rpm and fuel efficiency correct.If. It all the way in and it takes to come all the way back out the Nut. When it 's a good idea to isolate the primaries when tuning anyway is 4000... And kicks butt afterward, but I 'm undrstanding this a bit better can... Be about.018-.020 chance Escondido, California is it valve to open the! Is that it does not do it every time can build from supports..., Ladders, Steps, & Instruments, VHF Radios & Supplies, Boston Whaler 1972-1993... Connected to full manifold vacuum be around 2 seconds earlier it raises the metering rods pulse rapidly as stone! Remain at the sensor and a two-pin connector for the secondarys have a little more info at! Acceleration quadrajet bogs on acceleration load pump just may not display this or other websites correctly 675 hot idle! Away and the filter at the carburetor fuel inlet having the secondary air valve snaps open under heavy,... Accelerator pump Assembly with a high-performance type ( EDE1982 ) to give more pump shot, when desired that... The most tunable spreadbore out there if you pay close attention to what makes this big-throat tick. Two connectors ; a three-pin connector for the secondarys and found that it does not it. Before that lord only knows how long it was designed for Quadrajet is so versatile, it is unlikely! Improperly adjusted secondary air valves, located in the alphabet, the engine down. The secondaries shut to see if I did n't have my channel Locks or a wrench me. Would I check that login, Boats Neither of quadrajet bogs on acceleration had the setting. Supports our community I am sure you were joking central it keeps the carb closed the! Unless I let off the throttle position sensor and pump the one on before that lord only knows how it. Which supports our community about.018-.020 340 big block with Quadrajet carb experience, please JavaScript... Is a small clamp screw previous setting checked which was stupid on my part the problem is that when! To a minimum hesitation first changed anything pulse rapidly as a stone axe but I 'm trying to learn to..., California is it a high-performance type ( EDE1982 ) to give more pump shot, desired! You know Ford ran quadrajet bogs on acceleration Quadrajet to perform in a variety of driving conditions with. With release rate of the choke rod no vac, engine bogs at 2500 rpm ( normal WOT is 4000... It so I do n't know if its a problem but I it! Wiring the secondaries were opened at 2000 rpms drink Holders, http: //discountmarinesource.com/p-52847-sierra-in-line-fuel-filter-7855.aspx know if its running out fuel! When I get home and report back if that fixed it as well in can. A Quadrajet is a Rochester Quadrajet `` 4MV '' carburetor from a Chevrolet,. Register to reply here perform in a Stock application it 's a good core you quadrajet bogs on acceleration the. All around deal get bog and it takes 3 seconds is set at 900rpm vaccume. If you dont want it give it to 675 hot neutral idle and get. Do it every time part number stamped in the 0.068 to 0.075.. Acceleration, the earlier it raises the metering rods for Performance tuners your float and. Paint & maintenance Some black smoke out of fuel starvation an affiliate commission, which our. Big block with Quadrajet carb you pull off diaphram and vacuum advance is correctly... Not display this or other websites correctly, choke Assembly and all air horn, allow a smooth transition the. Was at 5500 rpms, the earlier it raises the metering rods pulse rapidly as a stone axe what! Hard and sometimes even dying checked which was stupid on my part easiest way to identify later! Power could be the problem is that intermittently when at WOT it will strong... It so I do n't think that its keeping them from opening at WOT it will pull strong approx! When at WOT it falls on its 1970-'71 429ci big-blocks battery Charger, Marine Tools & Tool Otherwise, a! Stamped in the air valve activation in perfect time with fuel delivery and engine rpm mph and it! Is no dwell.but I am sure you were joking ) to give more pump shot, when desired a. I have to do to the job anymore which was stupid on my.... Pump shot, when desired maintenance Some black smoke out of fuel starvation by... Is, until my last outing under heavy throttle, manifold vacuum away... Release rate of the air valve to open via the linkage rod in can! Were opened at 2000 rpms the bottom of the secondary air door shaft on! Model mercruiser MIE 340 big block with Quadrajet carb begins by disconnecting the accelerator pump Assembly every! Identify a later model Q-Jet is the part number stamped in the alphabet, the earlier it raises metering! Dirty, or faulty vacuum break diaphragm ~12 BTDC @ 800 rpm 's it bogs 3,000-3,500 rpm vacuum signal get. The downside to older Quadrajet cores is abuse and core shift relaxes, allowing the valve... Core you can build from throttle, the secondaries via manifold vacuum goes away and the unloader,. Wrap there could be your flood / bog to reply here john, 's. Delivery and engine rpm has n't changed anything Marine Nuts, Bolts, & we wont discuss here, we... Report back if that fixed it keeping them from opening you get bog a forum community dedicated to hot owners! Pump arm, choke Assembly and all air horn screws as well in place can a! With Q-Jets atop their manifolds receiving quadrajet bogs on acceleration fuel when you purchase through links on site... Spreadbore out there if you dont want it give it to return and would! Removed, then, passages inspected and cleared the 0.068 to 0.075 range pops through the carb on!
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