Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem
Idle problem
tayto:
it's installed upside down. you might have to disassemble carb to fix it. i usually install that linkage as an assembly when i reinstall the throttle shafts.
dlphil10:
Well that makes a lot more sense with the stop on the shaft... That's the way I got the carb.. Thanks for helping to clear that up. Now to figure out the off idle studdering.
Cliff Ruggles:
15 degrees initial timing is probably OK, but not adding another 20 degrees, especially at idle.
The only engines I see that like that much timing have too much cam and not enough compression in them.
35 total plus another 20 from the VA is also a LOT for one of these engines. I usually shoot for 42 to about 48 degrees, initial plus mechanical plus VA, and for most builds I use ported to the advance, not manifold.........Cliff
dlphil10:
I should be right on then as I've got 48 total at cruise. 15initial, 20 mechanical and 13 vacuum advance.
dlphil10:
Is it generally acceptable to reuse the base plate to main casting gasket when I fix the linkage? Looks like I'll be raising the float back up to .25in while I'm in there as I lowered it a bit a while back.
I noticed the engine sags when vacuum hits 7inhg and recovers at 5inhg. 7inhg corresponds to the power piston opening. Is there a great way to measure the proper power piston hanger height?
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