87' Grand Marquis - Revs Up in drive

Tiny
DOPEY85
  • MEMBER
  • 1987 ALL OTHER MAKES ALL OTHER MODELS
My car wants to rev itself up wheather I push the pedal or not. I revs up high enough the if I don't fully push the brake the back tires will start to break loose. I tried pushing the accelerator to try and get it back down, but it stayed fast. I tried putting it through the gears and it acts like it would if you were push the accelerator and brake at the same time in put in into gear. I feel unsafe driving with my 17 month old son in the car. Please help
Tuesday, August 8th, 2006 AT 4:14 PM

3 Replies

Tiny
MIKEYBDMAN
  • MECHANIC
  • 623 POSTS
First off, does it ever go back to a lower idle, like when it warms up? When did this start, or was it gradual and not noticable?
Your idle is controlled by the EEC-IV idle speed control unit. Sounds like something in that circuit has gone bad. It could be as simple as a sensor, or as complicated as a computer issue. You are probably going to have to take the car to a mechanic and have them test it out.
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Tuesday, August 8th, 2006 AT 6:23 PM
Tiny
DOPEY85
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  • 2 POSTS
Yeah it goes back to normal idle after it runs for about 10 minutes or so. It started all of the sudden. If I can find out what is wrong with it. I might be able to do it myself.
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Tuesday, August 8th, 2006 AT 11:23 PM
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
Could also be bad O2 sensors
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Tuesday, March 6th, 2007 AT 8:48 AM

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