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Old 10-09-2012, 07:27 AM
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Rough Idle

OK I have tried doing my own research but I just can't get this one licked. I have an 05' F-250 6.0L. My truck runs fine (usually), cranks up fine (except once), and overall runs well. The only problem really is idling. In park and sometime in drive while at a dead stop, my RPM's will surge. They will go up and down. Not by alot but maybe about 500 rpms up or down back and forth. I have found that it is usually worse once my truck warms up. This has only happened one time but I went to start my truck one time and the starter just kept going and going but it wouldn't turn over. After about 3 tries it cranked right up. Then another time I put my pedal to the floor and my truck just wouldn't go and then it finally kicked in a took off. But like I said above, these 2 things only happened one time. And sometimes my truck will idle fine and other times it runs like sh*t. Just like the other day I unplugged my batteries for 10 minutes just to see what would happen. Boom, it worked. Truck ran totally great for 2 days but this morning it started it's crap again. My guesses are ICP sensor, or a bad FICM. Help me out boys. What do I need to check? How do I go about checking it? I don't just want to start throwing hundreds of dollars in parts at it or taking it to the dealership especially since it does run and gets me from point A to point B but I don't want to be on the side of the road one day. Please help!!
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Old 10-09-2012, 09:40 AM
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Mine had the same surge only at idle. New oil all motorcraft filters cleaned egr valve, And it was random. Took truck on 1900 mile trip towing enclosed trailer with bike did it thru first tank. After that truck never ran better. Right down to the charge on batteries while driving. Just throwing that out there, may need a nice long working haul.
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Old 10-09-2012, 10:07 AM
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Could be. I have been giving it hell lately with the pedal to the floor just trying to see if I can blow any crap out that might be in there. I have also changed the oil and filter, both fuel filters, and ran a system check through the OBD II. No check engine light and it isn't throwing any codes. Says the EGR is good too but I currently have an EGR delete on the way. Also this weekend I will being removing the cat and muffler. I might as well do it now because Im going to do it in the future anyways. Anybody else have any suggestions?! Im open to try anything
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Old 10-11-2012, 05:22 PM
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Sounds like icp problems to me. Do you have a monitor?

Sent from my phone that somebody didn't help me get.
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ficm, icp sensor, rough idle

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