engine rev

2003 FORD FOCUS
121,000 MILES • 4 CYL • FWD • AUTOMATIC
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DASDANIEL
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  • 1 POST
2003 Ford Focus - while driveing, the engine will rev up on its own. This happens during driving, when stopped, when in neutral and even when in park. Do you suppose this is a sensor or a computer issue?
Nov 29, 2010 at 1:20 PM
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WRENCHTECH
  • ✓Experienced Mechanic
  • 20,760 POSTS
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.

Nov 29, 2010 at 1:29 PM
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