Quadrajet Problem Solving > Dialing in your rebuilt Quadrajet carburetor

Float and APT setting recommendations

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T/A_455:
Got a fuel pressure gauge on it tonight.  At idle, I'm seeing 4.5-5 psi at the carb inlet.

I adjusted the APT and idle mixtures a bit further - I've gotten it to be much smoother, but it's still not quite there around town.

I'm still chasing down why the idle speed changes.  It'll idle pretty much steady at 750 rpm until I go for a drive - at stop lights it'll idle consistently at 1k rpm with the same steadiness.  If I shut it down and restart right away, it'll idle back at 750 until I drive.

Cliff Ruggles:
Those symptoms indicate fundamental issues, most likely the throttle plates aren't fully closing and sealing up well.  I'd correct that issue and I'm betting everything else will get much better......Cliff

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