RPM surge at stop - Ford Powerstroke Diesel Forum
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Old 08-24-2009, 02:41 PM
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RPM surge at stop

This has been happening for a little while now, never thought anything of it and the more i let it go the more it bugs me.

Truck is an 04 f-250, has an intake, straight pipe, and SCT tuner.

lately it has been taking a little more time to start up (longer cranking time it seems like) but this seems to come and go. not to worried here

When i sit at stop lights or drive throughs, the engine will idle about 1100 rpms or so, and will surge to about 1500 and then back down. This has been happening more frequently and scares me a little. Sometimes it surges so much the truck actually moves forward a little while im on the brake.

This being said, i have noticed no smoke comming out of the exhaust (other than the normal black when im smoking dmaxes )

Oil was changed about 6k miles ago (due for a change here soon) fuel filters replaced last oil change, air filter is clean, and EGR was also cleaned when i changed the oil last.

Im thinking possibly EGR stuck? or a bad sensor, ive only had the truck since 88k miles, 107k on it now, carfax said the EGR was replaced (cant recall when)

Hope thats enough to go off of, if i can help with anything else let me know, any ideas for troubleshooting etc would be greatly appreciated. Thanks in advance.
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Old 08-24-2009, 03:09 PM
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Any codes in the PCM?

What about idling in neutral or park? Do you get any surging?

It should idle at 640 rpms all the time (except for the 1,000 rpm cold weather fast idle or the 1200 rpm PTO fast idle).

ICP sensors seem to be failing a lot recently... without more info, that's what I'd be leaning towards.
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Old 08-24-2009, 03:43 PM
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my idle rpm's might be off i havent been driving that much lately regardless its about a 250-350 spike in rpm's when it happens. I havent noticed it in park and i havent tested this in neutral, i will fire er up tonight and see what i can find, no codes that i can see like i said havent been driving, i will throw the code reader on when i get home as well. Thanks for the response!
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