Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

Hard start hot

<< < (2/2)

442:
I didn't realize that was a passageway to the idle mixture screw as you were saying. My main body is porous/garbage 

Cliff Ruggles:
You can also get a leak there with the carb assembled IF the upper idle airbleed is blocked for some reason or not present.  If there is no upper idle bleed the carb will syphon from that passages after the engine is shut down.

If it leaks at that hole on the bench fuel is making it into that passage from the main fuel bowl....

442:
Don't mean to kick a dead horse, just sharing. I put some compressed air in the hole indicated, comes out the other hole indicated. This is on the pass side, drivers side does not bubble in that same hole. If I put air to that idle passage, I can't get any bubbles from the main body bowl area.

Cliff Ruggles:
You should NOT get any cross-connection between those passages.

It's rare but to date I've had a few castings that had that issue and replaced them.

I suppose with enough effort one might be able to repair them if you could find a thin sleeve to drive into that passage and get it to seal things off, but the damage may be deep enough where that isn't feasible.......

442:
ok, Thanks Cliff!
Chuck

Navigation

[0] Message Index

[*] Previous page