Question about 1995 Chevrolet Astro

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Fast idle astro van

2000 astro van - suddenly idle is very fast 50 mph on freeway.

The linkage not stuck, I can make it idle slow under the hood by pushing throttle back with a long wood dowel, but it speeds up when I stop pushing. Next morning, engine cold, same condition even after warm up.

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  • safari134 Jul 14, 2010

    Throttle position is apparently being held off of idle stop, as I can physically hold the throttle closed under the hood and make it idle. Is there a idle servo or something similar that is suddenly bad?

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Check the base plate gasket under the throttle body, some time the gasket start to leak, and will cause a high idle, if possible with engine running get some water and pore it at the base of the throttle bode, you will hear a suction sound, that's the gasket, replace it.

Posted on Jul 14, 2010

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