Very loud IAC


Aug 10, 2007
Alpharetta, GA
I cleaned this up before I stored it away while i was building the motor. As i was tuning yesterday, it was making a loud ticking/knocking noise. It gets a little quieter as it warms up. Is it on it's last leg?

I'll clean it again and see what happens..
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Cleaned it, still very loud, especially on start up until it warms up a bit. My idle is hunting as well. I am still going thru the checklist though.

I think with over 100K on that IAC, I might as well get a new one.
Check the spring tension on the throttle body too. Seems I remember a similar instance where the operation of the IAC was actually causing the TB to flutter due to a weak spring.