Tracking down a shaky idle - Ford Powerstroke Diesel Forum

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post #1 of 17 Old 06-01-2011, 10:09 AM Thread Starter
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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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post #2 of 17 Old 06-01-2011, 10:25 AM
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what year is the truck and how shakey is shakey?

-Matt

Late 99 (2/99) Black F250, CC LB 4x4 Lariat 214k. All Stock for the moment...

1995 PSD, ext cab, one wheel wonder , 297k miles, 30k on wvo. totaled 5/8/11 RIP This truck is for sale as a parts truck (Jason is about to receive forged rods, and drop kick his PMR's)
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post #3 of 17 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?

2008 6.4 f250 lariat 4wd
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post #4 of 17 Old 06-01-2011, 10:47 AM Thread Starter
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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.

1995 F350 Powerstroke Turbo Diesel 7.3l 2wd Crew Cab Automatic. 270,000+ miles
Bilstein Shocks, Aftermarket Downpipe, High Pressure Crossover Hose, Viper alarm and remote start, Tranny cooler, Cat delete, Homemade open air intake, Dick Cepek cab lights, Glow Plug Relay Mod, 140 IDM Mod, A/C Mod, SP Diesel Stage 1 Power Box, Hypermax Maxchip 300, Dual Electric Fans.
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post #5 of 17 Old 06-01-2011, 10:52 AM Thread Starter
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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.

1995 F350 Powerstroke Turbo Diesel 7.3l 2wd Crew Cab Automatic. 270,000+ miles
Bilstein Shocks, Aftermarket Downpipe, High Pressure Crossover Hose, Viper alarm and remote start, Tranny cooler, Cat delete, Homemade open air intake, Dick Cepek cab lights, Glow Plug Relay Mod, 140 IDM Mod, A/C Mod, SP Diesel Stage 1 Power Box, Hypermax Maxchip 300, Dual Electric Fans.
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post #6 of 17 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?

-Matt

Late 99 (2/99) Black F250, CC LB 4x4 Lariat 214k. All Stock for the moment...

1995 PSD, ext cab, one wheel wonder , 297k miles, 30k on wvo. totaled 5/8/11 RIP This truck is for sale as a parts truck (Jason is about to receive forged rods, and drop kick his PMR's)
DB high torque starter
DIY 6637
Marinco Mod
DIY Electric fuel w/ wvo conversion

"A clean house is a sign of a mis-lead life."
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post #7 of 17 Old 06-01-2011, 01:24 PM Thread Starter
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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?

1995 F350 Powerstroke Turbo Diesel 7.3l 2wd Crew Cab Automatic. 270,000+ miles
Bilstein Shocks, Aftermarket Downpipe, High Pressure Crossover Hose, Viper alarm and remote start, Tranny cooler, Cat delete, Homemade open air intake, Dick Cepek cab lights, Glow Plug Relay Mod, 140 IDM Mod, A/C Mod, SP Diesel Stage 1 Power Box, Hypermax Maxchip 300, Dual Electric Fans.
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post #8 of 17 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.

Pete in San Ramon

2005 F250 6.0 4X4 Lariat CC short bed (stock)

1997 F250 7.3 4X4 XLT Reg. cab (stock)

1986 F250 6.9 4X4 XLT Gone but not forgotten



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post #9 of 17 Old 06-01-2011, 02:25 PM Thread Starter
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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.

1995 F350 Powerstroke Turbo Diesel 7.3l 2wd Crew Cab Automatic. 270,000+ miles
Bilstein Shocks, Aftermarket Downpipe, High Pressure Crossover Hose, Viper alarm and remote start, Tranny cooler, Cat delete, Homemade open air intake, Dick Cepek cab lights, Glow Plug Relay Mod, 140 IDM Mod, A/C Mod, SP Diesel Stage 1 Power Box, Hypermax Maxchip 300, Dual Electric Fans.
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post #10 of 17 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?

Pete in San Ramon

2005 F250 6.0 4X4 Lariat CC short bed (stock)

1997 F250 7.3 4X4 XLT Reg. cab (stock)

1986 F250 6.9 4X4 XLT Gone but not forgotten



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