1996 Dodge Dakota Extremely Fast Idle

Tiny
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  • 1996 DODGE DAKOTA
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 194,000 MILES
After an oil-change at exactly 194,000mi, my engine began to idle extremely high - 2,000~3,000 revs depending on its mood.

I've thoroughly checked the throttle body and cleaned it, the throttle linkage itself is fine, the idle hasn't been changed from its factory setting - all of the cables are fine and the pedal is free and clear from obstruction.

The only things I've yet to check are the fuse panels in-cab and underneath the hood, and they're about to be next (covering all my bases) but I'm left scratching my head as to what could be wrong.

That leaves the TPS among other things - but, before I consider hauling it off to the mechanic, I'd like to keep working on it myself.

Any gurus with any good guesses would be very appreciated right about now. I'm about to pull my hair out. >=)
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Thursday, July 9th, 2009 AT 12:14 PM

3 Replies

Tiny
JDL
  • EXPERT
Hello, are there any codes? If you block the mouth of the throttle-body, does it have any effect on the idle, It should.
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Thursday, July 9th, 2009 AT 12:29 PM
Tiny
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The CEL is on, so it's throwing a code for sure - but it's not exactly safe to drive down to the shop to have them have a look at it.

I tried blocking off the throttle body - it had zero effect on the revs whatsoever, and I know I had a tight seal on the mouth of the TB.

I know that's not right.

. So where does that put me?

Also: thanks for the reply.

EDIT/CORRECTION: Okay, so I WASN'T getting a good seal.

After really jamming my hand in there and completely blocking off the air flow, it reduced the engine speed back to its normal idle. After breaking the seal, it's remained at the proper idle - but I don't know how long it'll stay that way.

It seemed to magically "fix" itself earlier this morning, but upon taking it out for a test drive, the problem with the high revs and "stuck throttle" revealed itself after about the first quarter mile.
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Thursday, July 9th, 2009 AT 2:53 PM
Tiny
JDL
  • EXPERT
I'm not sure I understood your edit? Do you still have the problem?

As far as blocking the intake, I was thinking of taking the air duct loose from the throttle-body, using something with a hard surface to block the mouth. In my opinion it should kill the engine, If it doesn't you have a vacuum leak some where.

You should be able to get some codes, by cycling the ignition switch, on--off, on--off, on then the check engine lite starts flashing, you count the flashes to get the codes. You don't start the vehicle.
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Thursday, July 9th, 2009 AT 3:28 PM

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