1993 Mercury Cougar idle waaaaaay too high

Tiny
MECHMAN1003
  • MEMBER
  • 1993 MERCURY COUGAR
  • 3.8L
  • V6
  • RWD
  • AUTOMATIC
I have had this cougar for five years now and she has been a great car until three weeks ago. I was driving to work and all of a sudden it began accelerating on its own. I could hardly get it to stop so I popped it into neutral. The motor then revved up to almost 3000 rpms. I have no cel or studdering or any other mechanical issues to speak of just high revving. I have replaced tps maf and the egr valve nothing has helped. This issue is making it dangerous to drive and is wearing the brakes excessively. Alot of the time I can smell the brakes burning when stopping at lights. Plz help me.
Thursday, July 3rd, 2014 AT 4:15 AM

1 Reply

Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
Assuming you first eliminated mechanical issues with the throttle body sticking open, you would have to have a major air leak somewhere. The engine has to be receiving unmetered air for that to happen.
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Thursday, July 3rd, 2014 AT 5:21 AM

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