Tracking down a shaky idle - Ford Powerstroke Diesel Forum
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Old 06-01-2011, 10:09 AM
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Tracking down a shaky idle

I need help diagnosing a really shaky idle. The needle stays still at 650, but idle is rougher than it should be. Truck is auto and has about 270,000 miles. Things done recently: oil change, new fuel pump, cleaned ipr, cleaned fuel bowl (diesel was not black), cleaned both screens on fpr, fuel pressure is sixty something, unplugged icp with no change. I read that replacing injector o'rings might help with idle, but just trying to get help. Thanks
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Old 06-01-2011, 10:25 AM
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what year is the truck and how shakey is shakey?
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Old 06-01-2011, 10:44 AM
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how many seconds does it take once it starts in the morning til the oil pressure gauge moves?
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Old 06-01-2011, 10:47 AM
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Sorry, i had just edited my signature. It's a 95. Truck had been sitting for a couple years due to the fuel pump, but I don't remember it being this shaky. Like I said, the needle stays put. It's not a shake like its running on less cylinders, but it's enough to make my loose door panels rattle.
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Old 06-01-2011, 10:52 AM
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I have not noticed how long exactly it takes for the oil pressure needle to go up. I don't think it takes that long, but I will definitely check tomorrow.
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Old 06-01-2011, 12:16 PM
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i was gonna say i had a 95. and it seems normal that the idle more like a tractor. but to rattle your doors, maybe a misfire?
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Old 06-01-2011, 01:24 PM
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I was on a ram hunt this past weekend, and the guide was driving us around in a '93 with around 32,000 original miles. That thing idled sweet. I guess to diagnose a misfire, I would have to take it somewhere to run a test, right?
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Old 06-01-2011, 02:09 PM
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You might want to give the UVCH harnesses a look. There a total of four two on each valve cover. Check for burnt pins.
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Old 06-01-2011, 02:25 PM
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I forgot to mention that when I was trying to bring the truck back to life, before I figured out the fuel pump was bad, I had replaced both gaskets and all 4 injector harnesses. But, I will check them again to make sure they are still good.
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Old 06-01-2011, 02:30 PM
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OEM or Dorman. Just curious. Injectors or o rings ever been gone through or replaced?
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