I don't know if its a problem but Older Quadrajet part numbers begin with 702 and 704. I've tried adjusting timing, hasn't changed anything. Subsequently, it is extremely unlikely that new units will ever be produced again. Any ideas? Parts, Sacrificial Anodes & I can hear the secondaries open every time I hold it at WOT. PM me for more information. Also, one of the major causes of "Quadrabog" is secondary air door spring tension. Carter did it with the Thermo Quad and AVS. It ain't worth the 7 dollars for all the grief you can suffer. 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. Boarding, Paddles & to fix the sticking lifter did you replace it? Manufacturer, Boat Tables & I did some looking on this site and others and i've done a lot of youtube watching on these carbs. The Bog simply means the engine is not receiving enough fuel when you go to wide open throttle. Good for the interstate cruise. Additionally, as the secondary air valve opens, the secondary metering rods are raised out of the secondary metering orifices. The Fora platform includes forum software by XenForo. You must log in or register to reply here. Lighting, Marine Teak Shop Assuming an RPM drop in the water, i'm going to have to turn that idle up and maybe do some mixture adjustment. http://s160.photobucket.com/albums/t164/MEJ1990TM. & Dock, Anchor Chains & 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 Bog simply means the engine is not receiving enough fuel when you go to wide open throttle. I cannot figure it out. 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. Shelters, Boat Look at it, it lifts the metering rods back there at the secondarys and hence fuel floes through the jets.That is how the secondary cicuit is metered. A Quadrajet rebuild is actually quite simple. All, Anchor & Thanks you guys im going to be working on the elky in a while ill check it out. I've got a 79 z-28 with some upgrades, nothing crazy. The Quadrajet has 1 3/32- or 1 7/32-inch primary throttle bores with either 750 or 800 cfm. Maintenance, Fiberglass & Epoxy Cure The Bog And Sluggish Response On Your Holley Four-Barrel Carburetor, By Properly Adjusting The Accelerator Pump Assembly. 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. Hopefully it did something. Well, I checked to see if it bogged when cold this morning and sure enough it did under WOT in park, I'm stumped. Are you saying run without the separator? & Live Bait An O2 sensor in the exhaust monitors exhaust oxygen content. Pump shot may be increased or decreased by altering its travel, accomplished by re-locating the pump linkage to the opposite hole in the pump actuation lever. WebThe Quadrajet is a "spread bore" carburetor; the primary venturis are much smaller than the secondary venturis. Covers, Boat Seat 01. They were touching the bottom of the air cleaner, and apparently they were only arcing under acceleration under load. The thing that is puzzling me is that it does not do it every time. Dollies, SportsStuff Great Big This may be cured by first putting a piece of black electrical tape over this portion of the gasket. Hits hard every time I stomp on it since it was installed. They are actually about as simple as a stone axe. Amazing what ends up in a reasonably clean fuel system. Maybe the choke is open too far? JavaScript is disabled. 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. pump ck. If the rod is missing or the pull-off defective, that could cause a bog. Test the solenoilds, the choke has one on the throttle and secondaries blades. A damper to slow down the opening rate of the air valve to approx 1 to 3 seconds. 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. The stock air valve spring setting is usually 1/2 to 3/4 turn from loose. Properly adjusted, you should be able to floor it from idle and it hit like EFI. It's a QuadraJet. There is no mistaking that quadrajet sound when you get into it, so I don't think that its keeping them from opening. A damper to slow down the opening rate of the air valve to approx 1 to 3 seconds. Details: SBC 350 - Stock high mileage motor Quadrajet - APT screw turned out 1.5 turns from bottom w/ 67 jets. Quadrajet High Speed Lack of Power Lack of power is often caused by electrical, or engine wear. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. I checked the lock bar out and it is working fine. Telescopes, Covers and See if all is same then? Engine is 1986 model mercruiser MIE 340 big block with quadrajet carb. 02. Rails, Marine Tools & Tool Covers, Boat Shrink Wrap This may be a fuel delivery problem. The power Piston is stuck in the q jet. Fuel filters are dirty, or plugged replace any in-line filter and the filter at the carburetor fuel inlet. Downs, Couplers, Mounts, He and other knowledgeable Q-Jet racers learned that there are not necessarily any tricks to perform, but rather cures for ailments. Terminals, Marine Fuse Blocks & That is, until my last outing Under heavy acceleration, the engine bogged down and stumbled. All rights reserved. Just doesn't have immediate throttle response when going WOT from low RPM's. 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. Savers, Boat Trailer Guides & What's more, the Quadrajet carburetor was employed by every single GM division throughout its long 25-year production life. It has been proven you can modify the Quadrajet to flow in excess of 1,000 cfm. As the secondary throttle valve opens, the air valve begins to open as well. This thing runs great, starts every time and idles nice. Sounds like a possible float issue to me. 3 things I'd check John: ( other than a big vaccum leak which would do this). The Mercruiser 5.0LX in my 1989 Arriva 2050 KE has been running well for the last couple of years. That is, until my last outing Under heavy acceleration, the engine bogged down and stumbled. Well said Tech. 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. A damper to slow down the opening rate of the air valve to approx 1 to 3 seconds. Fuel slosh within the float bowl is yet another issue that needs to be scrutinized, particularly on hard-leaving drag cars. Galley, Covers and 3. One nice thing about the Quadrajet is fuel economy if you keep your foot out of it. Let's say about 300 horsepower to help give you can idea. All, Boat Bimini Hardware, Boat Trailer Petite primary bores keep fuel consumption to a minimum. Unless I let off the throttle, the engine would die. JavaScript is disabled. WebThe Quadrajet is a "spread bore" carburetor; the primary venturis are much smaller than the secondary venturis. Ford did it via the 4300/4300D/4350 carburetors. Engine is 1986 model mercruiser MIE 340 big block with quadrajet carb. Yours should be around 2 seconds. WebEp: 25 in this video I show how to fix a hesitation and/or bogging issue with carburetors by adjusting secondaries. This thing runs great, starts every time and idles nice. I've tried adjusting timing, hasn't changed anything. I rebuilt the Quadrajet and the car starts and runs very smooth. The faster you go the worse it gets. 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. Charts & The secondary spring doesn't come into play until after this has happened. Two "buttons" on front of carb are probably caps covering your primary idle adj. So anyway the issue is that it bogs real bad if I punch it while rolling. 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. Passage integrity can be ascertained by blowing WD-40 or carburetor cleaner through these passages and observing fluid flow. was strange. Trailer Winches, Shop ACCOUNT, Find The downside to older Quadrajet cores is abuse and core shift. Switches, Shore Power & AC Following all of these procedures and doing a thorough rebuild will certainly wake up any Quadrajet. Another possibility, and it is real. 03. The Quadrajet has mechanical secondaries, which open promptly when you mash the gas. Grills, Boat Drink Wells, Toilet & Waste Biminis, RV & Trailer This design is not unique to the Quadrajet. Towers, Tow Ropes & In its most basic form the Quadrajet was produced as the "4MV" (automatic choke/manifold choke stove), "4MC" (automatic choke, integral choke heat coil, heat tube) and the "4M" (manual choke). Most modern They are actually about as simple as a stone axe. 220/230 cam, world product heads, 9.5:1 compression, etc.
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