Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

Pinging at WOT second gear

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l.neidlinger:
Well, thanks National Carburetor.

It must have sucked a gasket today. Suddenly surges like a vacuum leak at idle. Disconnected all vacuum lines, no change. If I put my hand over the choke, it pulls 20" and smooths out. Sprayed around the outside of the carb, no changes. Must be internal.

The inside of this carb is horrid. It looks like it was used as a saltwater boat anchor. The mating surface of the body and the air horn is the same. It looks like they tried to get one of the jets out, but it was stuck and they nearly rounded out the jet trying to get it out.

Lesson learned.

Cliff Ruggles:
You found out why we don't work on commercially "remanufactured" carburetors here, they are PATHETIC!......Cliff

blazer74:
Thankfully you still have the original carb and didn't give it up for a core.

Cliff Ruggles:
I hate to beat a topic to death, but we STRONGLY advise folks to avoid anything commercially "remanufactured".  You just can't mention this enough as we continue to see folks buying over the counter q-jets and having extremely POOR results with them.

The companies that build these "remanufactured" units have even resorted to using front inlet carburetors to replace side inlet Chevy carburetors by installing a goofy 90 degree fitting into the front of them.  Just had a customer contact me a few days ago about having us build one for him (pic below).  It's an Oldsmobile center section with a Chevy bottom and choke linkage on the side of it.  The carb was originally "hot air" choke, so no telling what cobbling was done for that conversion, and it's NEVER going to work well no matter how much effort one were to put in it.

It's also EXTREMELY dangerous to have a bunch of rubber hose on the pressure side of the pump.  That line should be solid steel with the filter inside the carburetor. 

If/when you cut a metal line to install rubber hose and clamps, at a minimum put a bulge on the ends of the steel lines so the hose can't slip off if you hit a big bump or get into a collision........Cliff

73ss:
The zip tie to the heater hose is a nice touch. That should keep the fuel nice and cool.

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