I recently removed and cleaned my throttle body and IACV and now whenever I start the car there is a high pitched squealing noise coming from the passenger's side of the engine bay near the firewall. The noise is so loud I can hear it distinctly in the cabin even with the windows up. The idle also hunts when warm going from 1500 to normal idle back and forth. The squealing noise goes away under acceleration.

All this got me thinking that there is a problem with the IACV, but any other suggestions as I've already tried removing the IACV and everything looks fine.

Thanks in advance.

 

vacuum leak

 

I checked all the vacuum lines and they all look okay to me, but I'll double check. Any other ideas?

 

looks ok? you need to get some brake or carb clean and spray it around while the car is running & see if it bogs. if it does, then you found your leak.

 

Yea I was just reading the vacuum leak troubleshooting threads. But what seems to be different here is my very loud squealing noise. Either way I'll try the carb cleaner. Thanks.

 

Used the carb cleaner trick and found the leak at the TB gasket. There was a piece of old gasket the I didn't scrape off. Got out the razor blade and cleaned it off, put everything back together and the problem was gone

Thanks guys...

 

glad to help