97 auto rev?!

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Sep 18, 2006 | 10:45 PM

viperrtblck

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97 auto rev?!

97 powerstroke and previously was "grunting" at me. engine would fluctuate rpm as if i was turnin a/c on or off. i posted a different post about this..but anyways--i unplugged my cam sensor...cleaned terminals...put dielectric grease on them...put it back together...and haven't noticed problem...started today with engine coolant fairly wamr....started up fine--abotu 50 degrees outside temps...and engines revved BIG time...worst i eva heard it do this....i had another truck running at the time..so im not possitive..but it sounded like it did it twice..i was walking away from it and it revved up to about 1100 or so it sounded like then back to idle...when i cam eback to truck about 2 mins ilater...it was still running and didnt do anything abnormal after that. one guy i was with said his semi did that sometimes on cold mornings. "throttle pedals have a mind of their own"...anyways---after that i drove home and it was fine!? any help? just the high revving is what makes me wonder...im not kidding when i say it was about 1100 or higher.

Sep 18, 2006 | 11:13 PM

ForemanES

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From: AZ

Only of freezing mornings the idle goes up, but only up to maybe 900 rpms.
The idle fluctuating might be a worn IPR. Sounds kinda fishy

Sep 18, 2006 | 11:26 PM

viperrtblck

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when fluctuating mention in other posts...i meant slithtly--not even 100 rpms...ALSO problem isn't constant..it's intermittent...but tonight when it did this it was REAL noticable..like--not the high idle it does when its cold..it literally sounded like somebody revved it up from inside the cab. anyways- what is the ipr..where is it located..any pics of it..and how hard is it to change?

Sep 18, 2006 | 11:49 PM

ForemanES

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The IPR has been known to cause a rough idle when the engine is warm. Has it done this before? or is the first time? Are you sure no one jumped in the truck and is messing with you?

Maybe check all the connections at the petal itself and check for bare wires grounding out. Maybe someone will give you better advise later.

You cleaned your cps? Did you take off any material from the contacts? Did it ever "rev" before you cleaned it?

Last edited by ForemanES; Sep 18, 2006 at 11:55 PM.

Sep 19, 2006 | 12:41 AM

viperrtblck

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well i posted before abotu this problem...people told me cps...but while i was driving it would "studder" and wait to start light would come on and then shut off....at same time--engine like..shut off and came back....but haven't had problem since i messed with cam sensor and dielectric grease..but even now i think it still does this(im so used to it i dont even notice) when it's idling..only sometimes (intermittent) the idle will fluctute about 50-100 rpms or so according to the tach. not terrible but enough to move tach nd hear a change in engine noise..thats all..other than this the truck runs fine?!

Sep 19, 2006 | 01:25 PM

viperrtblck

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in order to remove the ipr valve...do i need to remove or loosen my fuel filter housing?

Sep 20, 2006 | 08:02 AM

plowhand

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From: Southwest Georgia

No, you do not have to lossen or remove the fuel filter housing. You do need to disconnect the two fuel lines going to the FPR and move them out of the way.

Drain HPOP resevoir, (remove plug in top and suck out the oil, a little over a quart), unplug the electircal connection on the IPR, remove the Timmerman nut and slide the solenoid off the shaft, place paper towels in valley under IPR to catch the oil, unscrew IPR and remove.