94' CPI IAC Valve Help

94' CPI IAC Valve Help

Postby AmericanMade717 [OP] » December 20th 2010, 7:14am

Hi all! Sorry I haven't been around much, been busy with school. I think I found the issue with my surging/idling/possibly hard start. Last time I was home I was having the Check Engine light on so I ran the codes and it came up with the IAC valve. Now it's been idling weird and the Check Engine light comes on after it idles for 30 seconds and then shuts off once you move. I'm certain that it's the valve and I have some time tomorrow so I'm planning on doing some work, however my Haynes manual doesn't explain much about the valve except to take it to the dealer for service (thanks a lot Haynes). I know the valve is mounted on the throttle body but I've heard a lot of different stuff about it. I hear you have to remove the thoddle cable and there are 2 screws that are easy to break off. This scares me because it's 25 degrees out and I don't feel like drilling and re-taping holes. All I'm asking is how to remove it? I have a 94' Astro W vin with the CPI. Any help will be apreciated, thank you!
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Re: 94' CPI IAC Valve Help

Postby Lumpy » December 20th 2010, 9:18am

Some IAC valves are threaded and screw in, some use the two screws
you're probably talking about. Mine (89) is the thread in style, so I
don't know if the screws are problematic. The thread in style have two
different kinds of electrical connectors so you have to make sure
you're getting the right ones. It is easy to tell by looking at the
existing IAC as it sits in place on the engine. But you can only see
it and reach it from the rear of the engine (doghouse off).

Mine was not difficult at all to replace. It was more difficult to get the
doghouse cover on and off than to replace the IAC.

It's critical to set the length of the extendable pintle before installing.
Instructions that come with the valve were very clear on mine. Similar
instructions in both Haynes' and Chilton's books.

Once the doghouse was open, it probably took 3 minutes total for me
to replace the thing.

After replacing, you have to drive it around for a while at varying
speeds to allow the thing to reset and synch with the onboard computer.

I wouldn't want to do it in freezing weather, but that's not because
the job is difficult.

I replaced the electrical connector/pigtail while I was in there.
Just because I could. That added maybe another 5 minutes.


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Re: 94' CPI IAC Valve Help

Postby AmericanMade717 [OP] » December 20th 2010, 7:17pm

Thank you! after some more research I did I know that mine has 2 screws that screw in and a electrical connector on top. A post I found somewhere on Google a guy said he snapped the 2 screws off on a 98 model or something like that so I'm a bit worried about doing work in to the cold. New Jersey weather is weird so if the temperature gets up to the 40's in the next couple weeks (which it very could possibly do) then maybe I'll get a new valve. Thank you for all your help Lumpy! Take care!
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Re: 94' CPI IAC Valve Help

Postby Leeann_93 » December 21st 2010, 1:04am

It's 2 torx screws. You don't have to remove the throttle cable. Just spray a little PB on them, tap and leave it for 1/2 hr with a worklight shining on them.

Unscrew the 2 screws gently - but there is some threadlocker on them - and then gently twist the IAC valve to loosen, then pull it out. There's an o-ring you need for reinstallation. Clean the pintle and the bore the IAC lives in, then reinstall after lubing the o-ring with engine oil. Reconnect the electrical connection after you've squeezed some dielectric grease in there.

Don't get a new IAC yet...they're not cheap.
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Re: 94' CPI IAC Valve Help

Postby AmericanMade717 [OP] » December 21st 2010, 8:16pm

They're $44.99 at Pep-Boys so I know they're not cheap. However it beats the $190.00 EGR valve I had to get, I couldn't clean mine for anything. And I'm about to go out there now and start working so I'll let you know how it comes out. Thank you for your very much for your help Leaann!
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Re: 94' CPI IAC Valve Help

Postby AmericanMade717 [OP] » December 21st 2010, 9:15pm

So I just took off the air cleaner and everything in my way and when I get back to the valve the mount for the thoddle cable is in my way. The mount looks like there's about a hole the same size as the IAC valve to let it slip through to get it out but on the back there's about 1/8" inbetween the head of the back screw and the mount. Nothing will squeze in there. I don't know if I want to be pulling this mount off it's pretty chilly outside and honestly this mount just looks like a ***** to pull off. It holds the troddle cable and is attached by nuts and screws in like 5 places, and then it's attached to another mount or something farther back and that mount actually might be in the way too.
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Re: 94' CPI IAC Valve Help

Postby Leeann_93 » December 21st 2010, 10:33pm

I can't take a pic of this installed in my '93 Astro 'cause I've already removed the upper plenum, but here it is installed in my '93 Bravada (which looks exactly the same):

93_IAC_1.jpg


I didn't have to remove the throttle cable mount to get to those screws or to pull the IAC out of its bore. It's a bit harder to see on the Astro, though.

And for a wider-angle view...

93_CPI_R.jpg
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Re: 94' CPI IAC Valve Help

Postby AmericanMade717 [OP] » December 22nd 2010, 6:17am

Thank you for the pics! Mine looks completly different on my van. In your picture it looks like the throttle cable goes towards the back of the engine. On mine, the throttle cable comes around the front of the engine, swings around under the air cleaner box and goes into the fire wall and it has an extensive bracket that blocks the back screw from being removed. There is also something above the engine up there that has another bracket that attaches to the bracket but I don't know what it is. I didn't take the dog house off today so I only had a veiw from the front. The brackets looked like a pain to get off and if it wasn't so cold and windy out I wouldn't have minded wrenching on it but the wind was killing me. Depending on tomorrow's weather maybe I'll get out and take the dog house off to get a better look and I'll def take some pictures to show you what I'm up against. Thank you very much for the pictures Leaann!
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Re: 94' CPI IAC Valve Help

Postby Lumpy » December 22nd 2010, 7:58am

And it's in a totally different place on her CPI engine than
it is on my TBI. Probably better disregard any of my
comments. It's a whole 'nuther animal on those Centrals.


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