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Old 06-14-2002, 08:20 AM
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Post Carb Adjustment

I have a rochester quadajet four barrel. It runs okay in park and neutral but when you idle at stop light RPM starts falling off and if you do not goose it once in a while it will die. Could it be a vacuum leak? Or is it in the idle jet adjustment? I set them for about one and halk turns but same problem. Any suggestions??DAVE E SHANK davesr@trianglesalesusa.com

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Old 06-14-2002, 06:55 PM
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Cool

DAVE---- Definitly check for vacume leak!
Do you know about the trick useing a can of carb spray?
Have you replaced the fuel filter?
Have you checked fuel pump pressure?
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Old 06-15-2002, 05:27 PM
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Maybe your idle speed is a little low, itl idle fine until you place it in drive, then the transmission pulls the engine down a little. A vacuum leak would effect idle in park/nuetral from what ive seen. I have seen cases where a sticking throttle has caused this problem, it will stick just enough to keep the idle up, then while driving, it will slip a little and there goes your idle, the throttle lever falls back on the under adjusted screw. Make sure your entire throttle assemly is clean and properly lubed. Also make sure the pedal travel is smooth ,shouldnt bind up or have any "rough spots".

[ June 15, 2002: Message edited by: 72 chevy ]</p>
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Old 06-15-2002, 07:19 PM
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Just a thought, does your quad have an idle stop selenoid? A/C? IF so, it should energize with IGN. on. by the way, dont lean that carb up too much, idle mixture is most likely not the problem. Need a few more details. Year?

[ June 15, 2002: Message edited by: 72 chevy ]</p>
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