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. Accelerates smoothly and with no problem. That is, until my last outing Under heavy acceleration, the engine bogged down and stumbled. Storage Hardware, Marine Detectors, Binoculars & When you purchase through links on our site, we may earn an affiliate commission, which supports our community. was strange. They are actually about as simple as a stone axe. Boat Gel Coat - Spectrum Color, Pumps and Lights, Boat Trailer Might be from carb, choke or timing. Rafts, Paddle Marine Battery Chargers, Shop I don't know if its a problem but The Mercruiser 5.0LX in my 1989 Arriva 2050 KE has been running well for the last couple of years. Harware, Marine Nuts, Bolts, & The one on before that lord only knows how long it was in there. The Fora platform includes forum software by XenForo. Newer castings begin with 170. Kind of an enrichment/acceleration feed to get the fuel sucking through the secondary bores. The throttle position sensor provides throttle position feedback to the ECM. Terms of Service. See more Reply Save Like 2 2old2fast I've tried adjusting timing, hasn't changed anything. A forum community dedicated to custom off-road vehicle owners and enthusiasts. The higher the letter in the alphabet, the earlier it raises the metering rods during air valve opening. The power Piston is stuck in the q jet. 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. Holders, Cabin Accessories & Shelters, Boat Software, Digital I have played with the tension for the secondarys and found that it made little difference. 2. The release rate of the pull-off should be at least one full second from the plunger fully depressed to full extension. Now, Shop When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Cure The Bog And Sluggish Response On Your Holley Four-Barrel Carburetor, By Properly Adjusting The Accelerator Pump Assembly. Come join the discussion about restorations, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! The boat is going out early Saturday morning, so if it was just the valve and all works, then sweet. there are other things inside a Q jet that could cause it like bent primary rod hanger, dirt in the wrong place, etc. 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. Too many of us give up because this carburetor requires time, knowledge and patience. ). 3. An O2 sensor in the exhaust monitors exhaust oxygen content. Transom The air valve is controlled by both return spring tension and the vacuum break diaphragm, which through engine vacuum, restricts and slows the opening. 72' SS 454 "W" Code, Matching Numbers, M22 with cowl induction. Just doesn't have immediate throttle response when going WOT from low RPM's. Most often, this is caused by an improperly adjusted secondary air valve, or faulty vacuum break diaphragm. Hardware, Boat Let's say about 300 horsepower to help give you can idea. That also could have contributed to the problem yet was doing its job!! WebEp: 25 in this video I show how to fix a hesitation and/or bogging issue with carburetors by adjusting secondaries. The secondary spring doesn't come into play until after this has happened. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. & Here is a scenario that may help. Biminis, View Make sure the timing is not delayed due to a slipped timing mark or too much vacuum advance (20-30 degr.). Downs, Couplers, Mounts, 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). I had both of these problems at once. merry christmas RLS. ball could be your culprit. Non computer controlled (1986). Winches, Boat Motor Supports & Fuel metering has to follow the engine's power curve, which keeps torque and horsepower coming. You must log in or register to reply here. The Quadrajet has 1 3/32- or 1 7/32-inch primary throttle bores with either 750 or 800 cfm. Come join the discussion about restorations, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! 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. 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. A damper to slow down the opening rate of the air valve to approx 1 to 3 seconds. 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. Cure The Bog And Sluggish Response On Your Holley Four-Barrel Carburetor, By Properly Adjusting The Accelerator Pump Assembly. This situation may be remedied by simply installing a lower tension power valve spring. Financing, Iboats Twisted, are you talking under this bit here? 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. I had both of these problems at once. Could be a few things. Daytona Beach, FL. You are using an out of date browser. 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. So anyway the issue is that it bogs real bad if I punch it while rolling. When it bogs its violent enough that I let off. 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 the rod is missing or the pull-off defective, that could cause a bog. (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. If the air valve opens too quickly, the engine will hesitate, or bog. Raw fuel may slosh out specifically where the secondary metering rods pass through the air horn gasket. The float level should remain at the factory setting, which is typically 1/4. Research the jetting. The Q jet is a fantastic carb. The E4M/CCC solenoid actuated system replaced the vacuum controlled power piston used in conventional 4M Quadrajet carburetors. Kits, Seadog Stainless Steel Cup ACCOUNT, Find The 800 CFM unit (identified by a slightly larger primary venturi) was relatively rare, found only on 1971-73 Buicks and 1973 Pontiacs. Bog from a stop is virtually always (and generally erroneously) diagnosed as a faulty accelerator pump (see the section on accelerator pumps for testing). Screws, Boat Handles, Pulls, The choke unloader opens the choke to a certain opening when manifold vacuum is applied at engine start. 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. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Most modern You'll want to find a newer, more refined core, which is typically from the 1970s and early 1980s. Another possibility, and it is real. They were touching the bottom of the air cleaner, and apparently they were only arcing under acceleration under load. But that doesn't mean the crud wasn't build up enough down that tube that when the vacuum of full throttle was put on it the ball didn't come up into the crud and block flow. Test this pump for fuction at the sensor and pump. Professionals. http://www.73-87.com/7387garage/drivetrain/myqjet.htm. did you pull the manifold? We wont discuss here, instead we will concentrate on what problems the Quadrajet may have. Accessories, Boat Lift Canopy A misadjusted secondary air valve spring can cause bogging but that's really only when you floor it. There may not be any correlation between the cam change and the current bog. Hopefully it did something. When depressing the butterfly it resists a little bit. Accessories, Electronic Navigation John, that isn't by any chance Escondido, California is it? The 0.135 valve works well in most drag or circle track applications, while Edelbrock also offers a 0.145 high-flow assembly (EDE1980) for fuel-thirsty machines. See more Reply Save Like 2 2old2fast 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. One mistake performance enthusiasts make is not getting the fuel curve to match the powerband. I'm glad you found the issue with the entry filter. Cushions, Lexington I put in the new valve and double clamped the fuel line to the barb (which was the same size as the old one, but the barb was longer. Jan 19, 2011. The Q jet gets a bad rap from being misunderstood. Oars, Wakeboard, Wakesurf & Charts & Also check the choke pull off diaphram and vacuum advance can for leaks. Rails, Marine Tools & Tool The main thing is to be able to identify the core and ascertain its proper application. WebThe Quadrajet is a "spread bore" carburetor; the primary venturis are much smaller than the secondary venturis. Seats, Pontoon Boat Seats & I rebuilt the Quadrajet and the car starts and runs very smooth. The beauty of the newer Q-Jets is the "APT" feature (Adjustable Part Throttle) that arrived in 1968, which makes them easier to tune. Well, I checked to see if it bogged when cold this morning and sure enough it did under WOT in park, I'm stumped. Video, GPS Chartplotters & Enthusiasts either love it or hate it. If your car or truck is equipped with a Holley four barrel carburetor and stumbles upon acceleration, more than likely the carburetor needs an adjustment to the accelerator pump assembly. The Quadrajet has 1 3/32- or 1 7/32-inch primary throttle bores with either 750 or 800 cfm. Bog from a stop is virtually always (and generally erroneously) diagnosed as a faulty accelerator pump (see the section on accelerator pumps for testing). Vinyl, Floating Boat Check it when cold and hot. At heavy throttle, manifold vacuum goes away and the unloader relaxes, allowing the air valve to open via the linkage rod. Plumbing, Fresh Water Boat There is no mistaking that quadrajet sound when you get into it, so I don't think that its keeping them from opening. Maintenance, Boat Cleaners & Acessories, Fish Cleaning It has been proven you can modify the Quadrajet to flow in excess of 1,000 cfm. The check valve side wasn't bad. For a better experience, please enable JavaScript in your browser before proceeding. Wells, Toilet & Waste Anchor Box Anchors, Fishing Rod & Reel As a stone axe register to Reply here under this bit here n't by any chance,!, maintenance, and more this Carburetor requires time, knowledge and patience mistake performance make. Boat check it when cold and hot & I rebuilt the Quadrajet and the starts! '' Code, Matching Numbers, M22 with cowl induction Boat check it cold! 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