4.0 Ranger hi-rev problem

hillvalleybronc · Mar 22, 2010

Im working on a 4.0 ranger. Put new head gaskets on it. new intake gaskets. Put everything back together, but it revs up to about 2500 and stays there and doesnt go down. I have checked for leaks with carb cleaner and cannot find any. The computer isnt tripping any codes and i am scratching my head now.. any help would be appreciated. thanks

Big Jim M · Mar 22, 2010

Is the throttle closeing all the way? Are ALL the lectric plugs plugged in properly? Is there a vac port open? Or a vac hose not installed? If all these are correct then go after the vac leak again... This really sounds like pilot error.
Big JIm

partsguy84823 · Mar 23, 2010

I vote IAC

pcollins · Mar 23, 2010

partsguy84823 said:
I vote IAC

same here. we had a ranger act like this at the shop. took the IAC off and fiddled around putting some paper and stuff in there, it fixed the problem. needless to say we had to replace the part to fix it right.

96Greenster · Mar 27, 2010

If it was the IAC wont the idle be intermitent... Like hi, low, hi, low etc..??

Big Jim M · Mar 27, 2010

Sometimes..

96Greenster said:
If it was the IAC wont the idle be intermitent... Like hi, low, hi, low etc..??

I've heard it both ways. But mostly hi-idle shows a problem IAC.
Big JIm :icon_thumby:

4.0 Ranger hi-rev problem

hillvalleybronc

15+ Year Member

Big Jim M

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partsguy84823

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pcollins

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96Greenster

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Big Jim M

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