how do I lower the idle on a 86 astro van

Asked by Oct 16, 2017 at 02:01 PM about the 1986 Chevrolet Astro

Question type: Maintenance & Repair

3 Answers


How high is the idle?


Does your engine have fuel injection or a carb?


It's likely a throttle body, 4.3L, the throttle body gaskets can degrade and leak air into system causing high idle. I'd look for any vacuum leaks, a short blast of starter fluid near a suspect joint or crack can cause a tell-tale jump in idle. Fuel meter is another place to look if it's dumping excess fuel.

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