Idle Air Control Valve replacement

STB

MEMBER
GMC SAFARI

1994 GMC Safari, 4.3L V6 EFI 180500 miles

I replaced the IACV with a new one. Now the engine idles approximately 2,000 rpm's. Followed the "reset process" (operate vehicle at normal engine temperature at 40 mph. The ECM will command the IACV pintle to mate and proper idle regulation should now result) It didn't!
I cleaned the old IACV and reinstalled and I've a better idle but not smooth.

Any suggestions?

v/r Steven Bridge

5 Replies

CHEVY22

MECHANIC
1,375 POSTS

You may have picked up a faulty part or the ECM didn't relearn with the new IAC, you may want to return the one you bought and try another, it sounds like you know what you are doing as far as install and learning. Need anything else let us know

Jim

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Saturday, February 24th, 2007 AT 8:24 PM

KIN CHAN

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453 POSTS

Hey Chevy, whatever he said on the reset procedure that sure didn't sounds like the one we used from alldata, I never try or look if tech2 have bidirectional on an older car like this. What do you say Chevy2?

By the way owner of this car, where did you get the reset procedure?

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Saturday, February 24th, 2007 AT 10:21 PM

CHEVY22

MECHANIC
1,375 POSTS

I just rechecked in gm's si and he pinned it, when the IAC has been disconnected the reset/relearn procedure is to run engine until normal o/t and drive it over 35 mph, it does say in parenthesis some models require a key on and off procedure.

Thanks Kin

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Saturday, February 24th, 2007 AT 10:47 PM

KIN CHAN

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453 POSTS

Wait a minute Jim. 1994 on GM is a split year. I know on some 4.3 is a vortex not TBI we don't do the key off and on stuff. Check that out. I think he's getting wrong info to reset.

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Sunday, February 25th, 2007 AT 2:44 AM

STB

MEMBER
3 POSTS

I've found the problem! I was under the van trying to move things around. It just didn't seem to be anything with the ignition system. I grabbed ahold of one of the engine mounts and it fell apart in my hand. Once I had the mounts replaced, the rough idle went away. I guess sometimes it just takes some sitting and looking.
Thanks for everyone's assistance.

In answer to KC's question as to where I got the reset procedures, they came with the part.

Thanks again!