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High idle

Tiny
FARHAD SHAUKAT
  • MEMBER
  • 1999 FORD MUSTANG
  • 3.8L
  • V6
  • RWD
  • AUTOMATIC
  • 193,000 MILES
Hi, need a help urgently as these problem is wearing on me day by day. My car's rpms jumps up to 1.5 rpms suddenly and when I change my gear to drive mode it comes back to normal, but when I keep the gear in neutral or parking mode again it jumps up to 1.5 rpms. I have already replaced the IAC throttle body was cleaned but the problem is still the same. Please give me a solution and with A/C or without A/C it is the same.
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Sunday, January 1st, 2017 AT 6:34 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,205 POSTS
Hey FARHAD SHAUKAT,

It sounds like you have a vacuum leak or a mass air flow sensor problem. Follow these guides and get back to me with the result.

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

and

https://www.2carpros.com/articles/mass-air-flow-service

Please let us know happens so it will help others.

Best, Ken

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Thursday, January 5th, 2017 AT 12:02 PM

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