Idle problems

Tiny
BLACKJACK1960
  • MEMBER
  • 1999 FORD CONTOUR
  • 2.0L
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 125,000 MILES
My car at idle in park, after you start it up it races high rpm and then drops to low rpm. It cycles up and down. IAC valve problem?
Thursday, August 3rd, 2017 AT 5:29 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
Hello,

It sounds more like a vacuum leak or MAF is out of range. Here are some guides to help you run some simple tests.

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

and

https://www.2carpros.com/articles/replace-an-air-intake-boot

and

https://www.2carpros.com/articles/how-to-replace-a-mass-air-flow-sensor-maf

and

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Please run some tests and get back to us we are interested to see what it is.

Cheers, Ken
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Thursday, August 3rd, 2017 AT 3:27 PM

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