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1999 Ford F-150 engine acceleration

Tiny
AARON CARRILLO
  • MEMBER
  • 1999 FORD F-150
  • V8
  • 2WD
  • AUTOMATIC
  • 10,000 MILES
It accelerates not often only does it when aircondition is on and some times the aircondition is not on and it does it, it goes all the way to 3000rpms, can you help on telling me why is this happeping.
Wednesday, July 21st, 2010 AT 3:04 PM

4 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
If it is reving that high on its own, either you have a bad idle air control valve or throttle position sensor. Has the check engine light come on?
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Wednesday, July 21st, 2010 AT 3:20 PM
Tiny
AARON CARRILLO
  • MEMBER
  • 2 POSTS
Yes it has
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Wednesday, July 21st, 2010 AT 3:59 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
I think you have a bad idle air control valve (IAC). Since the check engine light is on, take it to a nationally recognized parts store and have them scan the computer for trouble codes. Most will do it for free, and that way we'll know if I am correct.

Let me know what you find.
Joe
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Wednesday, July 21st, 2010 AT 11:10 PM
Tiny
AARON CARRILLO
  • MEMBER
  • 2 POSTS
Thanks, Joe. I sure will.
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Thursday, July 22nd, 2010 AT 9:08 AM

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