4.0 Idles Very High

[BigPurPleRanger]

I GOT A 94 RANGER 4.0 213,000 MILES I WAS DRIVING 7 HRS STRAIT AND WAS PULLIN PEOPLE OUT AND THAT AFTER THAT IT WOULD IDLE AT 2800RPM WHEN IN NUATRAL AND WOULDNT GO DOWN UNLESS I TURNED IT OFF WAT COULD IT BE?
THANKS rANGER rYAN

[oppy]

Turn off the caps lock, please! :redneck:

Does it have high idle when in gear also? Throttle position sensor maybe? Have you pulled codes?

[Offrhoder4x4]

Or a vacuum leak.

[TNRanger]

or crankcase blowby...

rings gotta be fawking long gone...

Compression test results?

[Digger]

Vacuum leak or stuck idle air motor

[BigPurPleRanger]

idle when im goin down the road and shift its a 5spd in between shifts it revs up then when i put it in gear it goes down to normal rpm
thanks Ryan

[Captain Air Time]

idle when im goin down the road and shift its a 5spd in between shifts it revs up then when i put it in gear it goes down to normal rpm
thanks Ryan


I've had 2 well used 4.0L's that did that on long highway trips. cool it off and its back to normal :D

[BLACKER_69]

poss intake gaskets.

[BigPurPleRanger]

i put another air intake valve or watever on top of the intake , it idles fine sometimes but other times it is like at 2200 on start up i have no clue?
wat it is
Thanks Ryan

[BLACKER_69]

sticking iac