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Old 01-21-2011, 11:41 AM
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If you don't find any obvious leaks, it's time to hook up a scan tool and check the IAC counts. They're typically in the 20-40 range. Anything lower would indicate a vacuum leak and higher can indicate a sticking IAC valve or blockage in the passage. You may even want to remove the throttle body and IAC motor an clean out the passages and pintle on the IAC. Carbon buildup could be preventing the IAC from moving into position. It's also possible the IAC is dead and not moving at all. Fixed IAC counts would indicate this.
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