2001 Ford F-150 motor

2001 FORD F-150
200,000 MILES • 5.4L • V8 • 4WD • AUTOMATIC
Avatar
BIGKAHUNALTD
  • MEMBER
  • 2 POSTS
The engine rev. rpm's regularly
I have changed out the mass air sensor but still doing it.
What else does that?
Nov 10, 2015 at 8:35 AM
Advertisement
Avatar
WRENCHTECH
  • CERTIFIED EXPERT
  • 20,761 POSTS
Could you give a better explanation of the the engine is doing?
Nov 10, 2015 at 8:44 AM
Avatar
BIGKAHUNALTD
  • MEMBER
  • 2 POSTS
Well the engine does high rev every 30 seconds
or so. No matter if engine is warmed up or not.
Nov 10, 2015 at 8:54 AM
Advertisement
Avatar
WRENCHTECH
  • CERTIFIED EXPERT
  • 20,761 POSTS
I hope you have not tried to mess with the idle stop screw.


You may have a bad IAC ( idle air control) but try eliminating any and all vacuum leaks and 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 10, 2015 at 9:08 AM