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1999 Lincoln Navigator over reving

Tiny
RSTJLANGLEY
  • MEMBER
  • 1999 LINCOLN NAVIGATOR
  • 5.4L
  • V8
  • 4WD
  • AUTOMATIC
  • 178,000 MILES
When I put the car in park with the engine warm ( after driving a while ) it sometimes revs up to 1500 rpm, the rest of the time it's normal. ( It has just started doing this ).
Monday, July 13th, 2015 AT 8:11 AM

1 Reply

Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 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, July 13th, 2015 AT 8:57 AM

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