Thread: Idle problem
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mark houghton mark houghton is offline
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Join Date: Jul 2008
Location: Central Washington State
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Sounds like maybe your AAV (auxilary air valve) is suspected of sticking open. Its function is to introduce air into the intake manifold when the engine is cold, to lean things out and cause a high idle. It has an electrical connection that feeds an internal heating element, which in turn eventually causes the valve to close once things warm up...resulting in the idle dropping back down to normal (engine heat alone will do this after awhile, but the element speeds things up). If you know that all your vacuum leaks have been corrected, then that is the first place I would look. You can take the entire valve out of the equation by disconnecting and plugging both air hoses (one comes from the intercooler which feeds air to the valve, and the other leaves the valve and goes to the intake manifold). Plug them both and you "should" have a very low idle in a stone-cold startup. If you continue to get high idles happening, then it's something else.
Old 01-01-2009, 02:23 PM
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