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'92 Plymouth Acclaim idles too fast

Tiny
JACKPOTBETTY
  • MEMBER
  • 1992 PLYMOUTH ACCLAIM
  • 75,000 MILES
Car is idling too fast acts like my foot is on the gas even when parked. When driving I can get up to 30mph without pushing gas pedal.
Saturday, October 15th, 2011 AT 2:52 PM

9 Replies

Tiny
DAN_K
  • MECHANIC
  • 213 POSTS
I would check the AIS (automatic idle speed) motor. For proper operation. This will require the use of a DRB-II scan tool.
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Saturday, October 15th, 2011 AT 3:43 PM
Tiny
JACKPOTBETTY
  • MEMBER
  • 6 POSTS
Where do I get that scan tool-is it something Auto Zone can test for? What about throttle position sensor, could it be that too or is that the same as the AIS?
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Saturday, October 15th, 2011 AT 5:13 PM
Tiny
DAN_K
  • MECHANIC
  • 213 POSTS
The throttle position sensor is a different thing completely. The TPS is a sensor and the AIS motor is an actuator - in essence, it controls idle speed. The DRB II is proprietary to a dealer, I'm not familiar enough will all of the aftermarket scan tools to be able to tell you if they will work or not.
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Saturday, October 15th, 2011 AT 6:13 PM
Tiny
JACKPOTBETTY
  • MEMBER
  • 6 POSTS
Okay, changed the TPS and the AIS motor and it is still idling on high and sucking up as much gas as it can. What to try next? Auto Zone or something and put it on the diagnostic testing thing?
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Tuesday, October 18th, 2011 AT 1:16 AM
Tiny
DAN_K
  • MECHANIC
  • 213 POSTS
I would have checked the AIS motor before replacement - if it was not at fault, why replace it? Have you checked for vacuum leaks? I also believe that idle speed can be adjusted with the DRB-II scan tool.
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Tuesday, October 18th, 2011 AT 10:42 AM
Tiny
JACKPOTBETTY
  • MEMBER
  • 6 POSTS
He said he checked for vacuum leaks before moving on to the TPS sensor and when that didn't fix it he replaced the AIS motor. Now my son-in-law is telling me that he disconnected the battery and to reconnect it and take it for a drive on the highway and see if it resets itself?
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Tuesday, October 18th, 2011 AT 12:29 PM
Tiny
DAN_K
  • MECHANIC
  • 213 POSTS
A reset may be possible if you leave the battery disconnected for about 5 minutes, but idle speed may still have to be adjusted with the proper scan tool.
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Tuesday, October 18th, 2011 AT 1:11 PM
Tiny
JACKPOTBETTY
  • MEMBER
  • 6 POSTS
Okay, it was the AIS motor and after disconnecting the battery it runs nice and smooth again. Thanks for all the help!
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Friday, October 21st, 2011 AT 12:49 PM
Tiny
JACKPOTBETTY
  • MEMBER
  • 6 POSTS
Okay, spoke too soon. Had to replace the battery and it ran smoothly for about 20 miles. Now it is idling high and seems to be overheating. It also shifts "hard" from park into gear. Timing belt, transmission?
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Friday, October 21st, 2011 AT 5:45 PM

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