revving engine

From: Joe Dille (
Date: Wed Jun 17 1998 - 07:00:06 EDT

I think the problem is in the Idle Air Control (IAC) motor. These things have
been trouble on all of the cars I owned with fuel injection. They respond well
to a cleaning with carb cleaner. I have never looked at the one on the Dakota,
but if it is like the Chebby you can take it off and clean the place where it
seats and the mechanism of the motor. They are reasonably easy to replace and
you can get them on the aftermarket. The Chebby part was under $100. The
subaru part was $400. Luckily I was able to clean the Subaru IAC.

My second guess is a bad connection to the throttle position sensor. All
these are is a variable resistor. You should be able to get the factory
specifications and check it with an ohm meter. The best check would be to check
it at the computer connection.

Drive Safe,


>Date: Tue, 16 Jun 98 23:41:03 EDT
>Subject: DML: revving engine
>OK, hope I'm doing this right because this is definately new to me. Here goes:
>We (my hubby and I) have a '92 Dak. It had 90-something thousand miles on it when we
>bought it. Now it has 130-something thousand on it. We've had it for about two years.
>After about 1 - 1 1/2 years after we got it, we noticed a problem. When the clutch
>was pushed in and your foot was off of the gas pedal, the engine would rev like it
>was idling high. I mean, you'd put the clutch in and immediately it sounds like
>you're flooring the gas pedal, only your foot is completely off of the pedal. Usually,
>but not always, it occurs after driving a little ways, as little as 1 mile. If you let
>it sit there for a while, it will calm down a little, but usually not as much as normal.
>Well, we brought it to the machanic, he said he changed something like the "throttle
>sensor" or something like that. I think it was three words, but I can't remember the
>exact term. For a while (3-6 months) it did OK, only idling high every once in a while.
>Well, it's started back. Today, I tried something. I just completely let my foot off
>of the gas pedal, put it into 5th gear to see how far it would go. Now I had accelerated
>up to around 55 mph already. Do you know it drove for about 7 miles going between 45-50
>mph on a straight stretch and it dropped to 35-40 mph going up a slight hill and up to
>55 mph going down that slight hill. What is the problem with this possessed truck? If
>anyone can help me, PLEASE, e-mail me and let me know. Thanks guys!

Joe Dille

Telford PA USA

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