IAC changed, still won't idle cold

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kappo50@yahoo.com - 15 Jan 2006 19:03 GMT

After changing the IAC on a '94 Aerostar (3.0),
is there something else required before it works ??

Still have the same problem: cold start it revs
up normanlly but after 10--15 seconds it dies.
It DOES idle after driving a block, but it's rough.

What other causes should I be looking at ??

thanks

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Bob Urz - 15 Jan 2006 19:15 GMT

> After changing the IAC on a '94 Aerostar (3.0),
> is there something else required before it works ??
[quoted text clipped - 6 lines]
>
> thanks

All the normal maintanace things.
Did you change plugs, wires, and ignition cap?
Check all small vacuum hoses carfully for cracks and leaks?
PVC valve?
Clean or check MAF sensor if you have one?

Start you truck at night and look closely at the ignition wires
coil and cap. See any light show?

Bob

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kappo50@yahoo.com - 15 Jan 2006 22:12 GMT

oops, sorry, I should have said --- it had a complete tune up about
6 months ago and it ran better than ever.........until the idle problem

started a month ago. So some of the things you mentioned I have
to assume were covered. But yeah, could have developed a vacuum
leak since then.

I remember someone saying they had to "reset the codes" or
something similar. How are they reset ?? ( eg, after changing the
battery I think it resets itself by just driving it or letting it idle
a
long time )

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Fred V. - 15 Jan 2006 22:34 GMT

Clean the throttle body.

Fred

> oops, sorry, I should have said --- it had a complete tune up about
> 6 months ago and it ran better than ever.........until the idle problem
[quoted text clipped - 8 lines]
> a
> long time )

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sleepdog@optonline.net - 16 Jan 2006 04:56 GMT

>> Still have the same problem: cold start it revs
>> up normanlly but after 10--15 seconds it dies.
>> It DOES idle after driving a block, but it's rough.

Check all the vacuum lines: PCV, EGR, CANP, Climate control. You'll
find them all neatly illustrated on the emissions calibration sticker
under the hood. What you are experiencing is 10-15 seconds of fast
idle, where the car's computer sends the signal to the IAC to allow the
engine to rev at higher rpms to warm it up. Then the signal stops to
allow the engine to idle normally, except in your case where you have
something gone awry it doesn't. I'm pretty sure that's it in laymen's
terms.

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