Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem
Fresh engine won't idle
Seff:
My engine builder says to specify that it's a 221/228@.050 on a 112lsa. That shouldn't be so extreme?
Seff:
Chased vacuum leaks today, every intake bolt got tightened about a quarter turn. Still rough idle.
carmantx:
Like Cliff said, you are going to need idle circuit modifications to get a proper idle without nozzle drip.
Seff:
Well, I have two carbs, so I might as well. Can you tell me what kind of modifications, or what page of the book shows this kind of modification?
Cliff Ruggles:
I would read the chapter on how they work, then go to the high performance chapter for specific guidance.
Bigger than stock cams reduce signal (engine vacuum) at idle and low rpm's and require minor idle system modifications so the engine can get enough fuel from the idle system to make it happy.
I'd look at recipe #3 for idle fuel, for what you are doing.
If you haven't done so I would also install one of our kits, and I can supply tuning parts, jets, metering rods and PP spring, plus sized idle tubes for what you are doing.
I'd also make sure that you blocked off the vacuum supply to the choke housing when the E-choke was installed, or there is a vacuum leak at that location.
Also vacuum test the pull-off, and time it. It will need to fully release in less than 2 seconds for what you are doing. We have quick release pull-offs available as well...tks.....Cliff
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