2004 Ford F-150 rough idle

Tiny
JMR83854
  • MEMBER
  • 2004 FORD F-150
  • 5.4L
  • V8
  • 2WD
  • AUTOMATIC
  • 164,300 MILES
Truck runs rough at idle also seems that the idle is too low around 750 to 800 rpms no check engine is on any ideas?
Wednesday, October 22nd, 2014 AT 6:03 PM

1 Reply

Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
The idle speed is controlled by the computer so you have no control over idle speed.

Try this.

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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Wednesday, October 22nd, 2014 AT 6:59 PM

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