Mechanics

WHAT IS THE LOCATION OF THE IDLE AIR CONTROL (IAC) VALVE

1990 Geo Prizm • 175,000 miles

Having the stereotypical high idle issues usually associated with an IAC valve possibly either going bad or just overly "gunked" up. The engine is a 4A-FE2 (?) Basically a Toyota Corolla engine

I've gone through seemingly every inch of the engine compartment, looked through various web-sites (except this one), part stores and manuals to try and find it; but I cannot seem to find anything that looks like what I believe an IAC valve should look like.

to try and reduce the high idle: I've cleaned the throttle body - as much as I could - I found and cleaned a part that I thought was the IAC valve. It had an electrical connector with a couple of small vaccuum connectors(one that "plugged" into the manifold? On the opposite end away from the throttle body) BUT it had NO visible moving part and no way to get into the housing.(Please see the attached : -)

I also turned the idle adjustment screw pretty much all the way down and adjusted the throttle cable, because it did not appear that the "butterfly" valve of the TB was closing all the way (even after I cleaned all the gunk : -)

and while these procedures helped a bit.I noticed the higher idle was still trying to reassert itself

Sooo. I'm stuck. Apparently I did not locate the IAC valve and would VERY much appreciate your help with location and other ideas
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Amysticalguardian
May 29, 2012.




Definitely will look for the part no. On the part itself.(I know the manufacturer is Aisin. And there is a number on it, but whether or not it is THE number.I don't know) and I'll call the dealer for this next step, as well.

(I've got little to no confidence that they'll be as helpful. Especially since they claimed not to have a clue about the location of this part in the first place or showed any inclination to really try; BUT at least now I/we got pictures. Sooo hopefully that will help jog their memories.)

this car is so old-in a way-and since it is of an earlier strange config between manufacturers, many of the newer techs have no experience with it and the existence of the older manuals are not readily available (if at all). But I always remain optimistic and open to being pleasantly surprised.

Because of circumstances.I'll have to be away from my computer for the rest of the week; but as soon as I can (and when I get some sort of clearer part info) I'll pop back on here to give ya an update.(Hopefully by no later than Monday)

in the mean time. Be well and have a great weekend, when it gets here. : -) Chat with ya soonest.


Tiny
Amysticalguardian
Jun 6, 2012.
Alright keep me posted.


Saturntech9
Jun 6, 2012.
I have the same issue with my 1990 Geo Prizm, any luck on getting that part? The numbers on the part are 17630-16070.
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Tiny
Nate66
Mar 22, 2014.
Found it,
89-93 toyota celica corolla vsv solenoid switch valve assembly air control
thanks anyway!


Tiny
Nate66
Mar 22, 2014.

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