beachfreak

I pulled the IACV off and cleaned it, and noticed it doesn't plunge if I push on it. Is that normal, since it is attached to an electrical motor inside, or is that a sign I should have just replaced it?
Engine starts and idles fine for 2-3 minutes on warm up. Then it starts to feel very subtly like it is struggling to idle. After about a minute of struggling, the idle clears up and within 2 seconds the SES light comes on.
Car is throwing no codes, so far I have changed the battery, fresh oil change, now cleaned throttle body and Intake Air Control Valve as well as new air filter.
Any thoughts from the great minds here?

Attached is photo of dirty IACV and throttle body, looks like they both might be upside down!

Cliff Harris

You need to push HARD. I usually press it against the edge of my workbench and lean into it. Sometimes wiggling the pintle around a little will help.

beachfreak

I bought a brand new one, it didn't move either. I went ahead and installed it, and no change to my situation. I'm stumped.
Maybe it's a vacuum leak.

Dr Jekyll

Just replaced my IACV on an 87. Solved my issue. Look at the plastic vac lines. Ill bet on a 90 they are brittle like mine were. Probably a broken one in the bunch. Also check the canister by the drivers side head light those are known to take a beating. Easy way to find a vac leak is a can of TB cleaner. Lightly shoot your vac lines at warm idle if you have a bad one the idle will surge. If its real bad expect a stall. Hope that helps you out.