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GMC Forum: IAC issue
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  #1  
Old 03-04-2020, 12:46 AM
mikenusaf mikenusaf is offline
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Default IAC issue

I have a 2000 GMC Sierra 4.8 and recently replaced the Idle Air Control. Now it idles too high and is slow to come down from any throttle inputs. I disconnected the IAC and the throttle seemed a lot better aside from a slightly low idle. I understand the computer needs to relearn the new part. I have tried disconnecting the battery for 30 minutes, letting it run for 5 minutes then turning it off, and driving it at 55 and allowing it to coast down to 45 but that doesn't work with the high idle it stays at 55. Help. Thanks in advance.
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  #2  
Old 03-06-2020, 09:34 PM
98trck 98trck is offline
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Location: Chandler Az
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sounds like a vacuum leak to me
but, I don't know what is involved to replace IAC.

PETE
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  #3  
Old 03-11-2020, 03:39 PM
mikenusaf mikenusaf is offline
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Default Was a vacuum leak

$150 later, it was the EGR Tube Gasket.
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  #4  
Old 03-14-2020, 03:35 PM
98trck 98trck is offline
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Thanks for the update
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