Cliff's Quadrajet Parts and Rebuild Kits
Quadrajet Problem Solving => Diagnose a Quadrajet carburetor problem => Topic started by: dblhh on November 18, 2008, 09:11:33 AM
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My 1977 TA has a Pontiac 400 with the Quadrajet carburetor. After it has been parked for awhile, you can start it up and it runs just fine with a smooth idle. After about a minute -- it seems about the time the choke opens up -- it begins idling really rough and will barely keep running. While the engine is warm, it continues to have a rough idle everytime it is started. Is this likely a problem with the carburetor or something else?
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Have you tried adjusting the idle mixture screws after the engine is fully warmed up? The symptoms indicate a lean condition at idle......Cliff
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Have you tried adjusting the idle mixture screws after the engine is fully warmed up? The symptoms indicate a lean condition at idle......Cliff
Cliff,
Thanks for the reply.
No, I haven't tried adjusting anything on the carburetor yet until I had an idea I was looking in the right area for the problem. I'll give it a try.
Thanks again,
Herrel
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"but when kicked down off of high idle. the engine wants to slowly die."
This often indicates the timing is falling off and may be combined with a lean carburetor condition, choke pull-off opening the flap a bit too far, etc......Cliff