Under valvecover wiring harness - Ford Powerstroke Diesel Forum
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Old 12-04-2007, 04:46 PM
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Under valvecover wiring harness

How often do the valve cover gasket/wiring harness need to be replaced? My truck seems to run smooth one time, then a little rough. It's almost like the injectors are firing intermittently on one or two cylinders, and there is a really strong exhaust smell like the motor is running to lean or the reverse, to rich. Any ideas?
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Old 12-04-2007, 04:51 PM
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there isnt a set time for the valve cover gaskets to go out , may want to inspect them to see if they are melted , you can unplug them at each plug in and just visually inspect to see if they are , and also has the check engine light come on any , need to have codes pulled
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Old 12-04-2007, 05:12 PM
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Are the stronger exaust smells that he is referring to an indication of trouble with the wiring undeer the valve cover?
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Old 12-05-2007, 03:09 AM
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if the engine isnt running correctly, there could be a bad smell, if you take the oil cap off it usualy smells burnt like an electrical fire in the crankcase
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Old 12-05-2007, 05:39 PM
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No check engine light at all. I'm just doing some head scratching. I guess the best way to describe what I'm feeling is like this: Imagine a gas engine with a spark plug that only fires sporadically. One time you feel like all 8 cylinders are running smooth, the next it feels like one isn't quite doing its' part, so when you accelerate it's more of a chugging feel. Maybe it's just me, like I said, no check engine light, and the mileage isn't that bad.
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Old 12-05-2007, 06:59 PM
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my harnesses went out a couple years back, they were smoking like a chimney.
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Old 12-15-2007, 11:50 AM
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hey thats the same thing my 2000 psd is doing right now, the dealership told me it was the idm doing it, auto stores couldn't puul a code on it and some guys on here told me to check the valve cover harness before buying a new idm so i'm getting ready to do that right as we speak.
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Old 12-15-2007, 11:55 AM
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one thing

Remember this, 99 and newer are common to come slightly unplugged and the 97 and older are common for melting.
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Old 12-19-2007, 12:09 PM
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Gentlemen,

I have the same issue. First time was after EBPV delete was done. Checked all wires to see if a I had damaged something in the process. No luck. Looked and looked and searched - nothing. One day it just went away. Never had a CEL. Here we are 6 months later and it's back. Would love to hear what you find as I am at my wits end.
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Old 12-19-2007, 12:52 PM
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Angry Hey

Im Have the same issue. I replaced my glow plugs and valve cover gaskets and about two days later it starts acting up. I ordered the harness for both sides. I going to put them in sunday and see if it fixes it I hope it does.
Ill post on sunday night and let ya know if it makes a differance.
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