Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem
Idle problem
Pat:
I have no air gap either (wish I did), but sure enough, it takes longer than average to reach operating temperature. Once there, it performs like a champ. Those q-jets are fantastic. Thanks for the response, Cliff.
Cliff Ruggles:
With a wet flow system a cold intake just doesn't work well. When the heat crossovers aren't open to heat the intake, it takes quite a while for engine heat to get the intake warm enough so fuel doesn't glob up on the walls and require a richer mixture from the carburetor.
To this day I don't know why folks want to block off the crossovers, it simply works poorly for anything street driven.....Cliff
dlphil10:
Maybe this is an issue for me too. My cross over is intact, but my coolant typically runs like 160-170. If I idle after cruising a bit it can creep up a bit.
I am also wondering two things uncarb related. I am wondering if this carb is too much for my build or if my rings are fully seated.. I did a compression test and all cylinders were 120psi. Seems low... Even why I was diagnosing the failure of that factory muscle 041 comp cam, the compression was 120psi to 150psi. This cam should close the intake more quickly than that 041. Seems to me those heads are far from 72CC.
Pat:
Your compression is even on all cylinders, and that is great. I think your next diagnosing step is trying a 195 degree t-stat. It's cheap and quickly done. Then, go from there. Basics should never get overlooked.
dlphil10:
It is a 195 thermostat.. thats what gets me. I do have a 3 core radiator. I wouldn't have thought it would be over cooling though. Would a weak radiator cap keep it from getting hot?
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