C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Minimum to do to replace IAC?

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Old Sep 2, 2013 | 01:46 PM
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Default Minimum to do to replace IAC?

I'm having some hunting idle issues, and I suspect the IAC, so it's time to have a look and clean (maybe replace) it.

I did this, once before, about 10 years ago, so my memory is fuzzy, at best.

I think I remember that I have to remove the coolant hoses that go through the throttle body and take the throttle body completely off. Do I have to go that far?

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Old Sep 2, 2013 | 02:09 PM
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You have to pull the throttle body but you don't have to remove the coolant hoses. I just pulled the air pump and vacuum hose to give more room so I could get a crescent wrench on the IAC valve. Should take 10 min tops.
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Old Sep 2, 2013 | 03:55 PM
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Originally Posted by SeeFourSix
You have to pull the throttle body but you don't have to remove the coolant hoses. I just pulled the air pump and vacuum hose to give more room so I could get a crescent wrench on the IAC valve. Should take 10 min tops.
Thanks, SeeFourSix. On my 87, the AIR pump hose wasn't in the way, but I had to disconnect the coolant hose and the vacuum hose on the driver's side in order to get enough leverage to get the IAC valve loose (it was *really* tight--I think I used some kind of thread seal when I replaced it last time).

I took me a little longer than 10 mins, partly because I forgot to put the gasket back on the IAC before I put it back in... sigh.

I just cleaned the IAC, rather than replacing it. It started and idled fine, so we'll see if that solves my hunting idle problem this coming week. If not, I'll be replacing it. One thing I did notice is that I can't really clean the IAC seat in the throttle body very well with it still mostly attached to the car.
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Old Sep 3, 2013 | 09:09 PM
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I found that one of the sockets (1 1/8", I think) in a plumber's socket set from Home Depot worked great on the IAC. Much easier than a wrench, I believe. Plus, I brought them back and got my money back.
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