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1999 Mercury Mystique idling

Tiny
JENBUNCIK
  • MEMBER
  • 1999 MERCURY MYSTIQUE
  • 117,000 MILES
Car runs excellent however when I come to a stop it starts idling up and down almost to where it dies. Then once I go it runs great again. The timing belt has been changed ppreviously. It also seems only to do this once it has warmed up. It hasn't died yet only idles up and down. Also seems to be idling high
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Monday, November 4th, 2013 AT 6:36 AM

1 Reply

Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
First eliminate all vacuum or air leaks in the system. You may have a bad IAC ( idle air control) but try cleaning the throttle body first. Remove the intake snorkel, have someone hold the throttle wide open for you and scrub the back side of the throttle plate and surrounding bore with an old tooth brush and some carb cleaner. Be sure to spray some into the small holes next to the throttle plate. That should help stabilize the idle. If it still has a problem, replace the IAC.
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Monday, November 4th, 2013 AT 7:52 AM

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