1998 Ford Explorer RPM gauge

GRUNION

MEMBER
1998 FORD EXPLORER
4.0L
4 CYL
4WD
AUTOMATIC
252,000 MILES

My RPM gauge goes up and down between 2,500 to 3,000 while on the freeway. Could it be.1) transmission slipping. 2) needs tune up. 3) Fuel filter. 4) or?

Wednesday, October 8th, 2014 AT 4:34 PM

3 Replies

JACOBANDNICKOLAS

MECHANIC
109,896 POSTS

Wow. It could be a few things. Does it feel as if the trans is slipping or do you just feel the vehicle speeding up and down? Has the check engine light come on?

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Wednesday, October 8th, 2014 AT 5:19 PM

GRUNION

MEMBER
2 POSTS

Engine light on for another unrelated problem. There is no jerking or feeling trani slipping. I do however hear the engine rev up a little but very slightly. Even when in PARK the engine goes up a down.

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Wednesday, October 8th, 2014 AT 6:34 PM

JACOBANDNICKOLAS

MECHANIC
109,896 POSTS

At an idle, when in park, chances are the idle air control valve is bad (IAC). The IAC is responsible for maintaining the engine idle speed. Also, you could have a vacuum leak on the engine causing these issues. Those would be the first things I check.

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Thursday, October 9th, 2014 AT 5:22 PM