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Sudden High Idle

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Old 02-14-2012, 01:09 PM
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Default Sudden High Idle

I've read all the stuff here on high idle rpm.
I checked every vacuum line I can find, even the PCV.
No vacuum leaks, no throttle binding.
I disconnected the battery but that didn't work.
Anymore ideas before I take her into the shop?
Cleaned the MAF and TB with no luck.
Old 02-14-2012, 02:23 PM
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Check the Idle Air Control (IAC) Valve, also try a TPS relearn.

Last edited by 99Bluz28; 02-14-2012 at 02:35 PM.
Old 02-15-2012, 08:22 PM
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It is a failed IAC.
$200.00 bucks they want for a new unit.
Old 02-15-2012, 08:55 PM
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try cleaning the IAC and see if it works .any codes ?you can probably find a IAC solenoid on here for cheap.I feel a IAC shouldn't cost $200.
Old 02-15-2012, 08:59 PM
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FYI, RockAuto has the ACDELCO IAC, Part # 17113391 for $90 .
Old 02-15-2012, 10:59 PM
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The IAC just came apart in pieces when removed.
I will replace the TPS also.
I shouldn't be too upset as it is a 12 year old car and the very first component failure with the exception of those Damn window motors and one headlight motor.
Still, I love this car and plan on keeping her around.
Old 02-18-2012, 09:56 AM
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Found the issue...
It was the chip set that went bad that I added.
IAC was a mess but after changing it, the idle did not come down.
So much for aftermarket electronics.




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