Check engine light at startup with rough idle - Ford Powerstroke Diesel Forum
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Old 08-14-2013, 10:20 AM
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Check engine light at startup with rough idle

Diesel newb here,

When I start it up the CEL lights up and the idle is a bit slow. If I let it idle, the CEL will turn off in 1-2 minutes and the idle will pick up a bit and even out. Sometimes the engine dies when the CEL turns off and the idle picks up. If I turn it off immediately after starting and restart, the CEL doesn't turn back on and it runs fine.

No codes as I took it to my local shop and their diesel tech couldn't read the computer. He said that he thinks the computer is bad.

95 ECLB 2WD E4OD

Any help or thoughts appreciated.
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Old 08-14-2013, 10:42 AM
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Unless his scanner is programmed specifically to read the Ford Enhanced PIDs/codes associated with the OBS PSDs, he has no idea whether your PCM is good or not. If the CE light is on, there are codes. You need to find a scanner that is known to be able to communicate with our trucks.
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Old 08-14-2013, 12:10 PM
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Computer is most likely fine (for reasons madpogue mentioned and it is running). Is it idling slow, but evenly? Or uneven (like a couple of cylinders are missing)? You might want to inspect the external valvecover connections for evidence of burning or melting. Also, remove the oil cap a take a sniff of the cap. If it smells like burned electrical insulation, you probably have issues with the under-valvecover wiring harnesses (UVCHs). Cheers!
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Old 08-14-2013, 12:39 PM
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It runs smooth, just lower rpm.
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Old 08-19-2013, 04:39 PM
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unplug your ICP, see if there is oil in the electrical connector. just replaced mine with same issues.
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Old 08-20-2013, 11:16 AM
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There is indeed oil in the connection. Can I clean it out and be good to go or is there other problems now?
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Old 08-20-2013, 12:13 PM
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It means the sensor is leaking "internally" (so it needs replacement). Cheers!
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