2001 Ford F-150 motor

BIGKAHUNALTD

MEMBER
2001 FORD F-150
5.4L
V8
4WD
AUTOMATIC
200,000 MILES

The engine rev. Rpm's regularly
I have changed out the mass air sensor but still doing it.
What else does that?

Tuesday, November 10th, 2015 AT 8:35 AM

3 Replies

WRENCHTECH

MECHANIC
20,758 POSTS

Could you give a better explanation of the the engine is doing?

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Tuesday, November 10th, 2015 AT 8:44 AM

BIGKAHUNALTD

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2 POSTS

Well the engine does high rev every 30 seconds
or so. No matter if engine is warmed up or not.

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Tuesday, November 10th, 2015 AT 8:54 AM

WRENCHTECH

MECHANIC
20,758 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.

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Tuesday, November 10th, 2015 AT 9:08 AM