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Old 06-19-2006, 07:01 PM   #1
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Car: 1992 Z28
Engine: 350 tpi
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Unstable Idle
What could cause an unstable idle? It's a comuter controlled quadrajet 305. It doesnt have a idle speed motor or anything. could my float be too high? Or is it something else?
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Old 06-19-2006, 09:22 PM   #2
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Engine: Carbed 350
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Could be a vacuum leak - check all the vacuum lines for cracks. Can also check by spraying carb cleaner anywhere vacuum could leak from while engine is running - if you spray it and the idle smooths out or increases, you found a leak. BUT DON"T USE STARTING FLUID for this - starting fluid is too volatile and catches fire too easily.
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Old 06-19-2006, 10:06 PM   #3
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Ok I'll try that as soon as I can.
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Old 06-19-2006, 10:49 PM   #4
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Get a vacuum pump and check the choke cannister on the side of the carb. And basically everything else related to vacuum.
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Old 06-19-2006, 10:49 PM
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Reload this Page Unstable Idle
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