Under valvecover wiring harness

[Gramps]

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?

[SCUFFY828]

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

[sea71]

Are the stronger exaust smells that he is referring to an indication of trouble with the wiring undeer the valve cover?

[SCUFFY828]

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

[Gramps]

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.

[sldghamr]

my harnesses went out a couple years back, they were smoking like a chimney.

[militaryman3756]

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.

Remember this, 99 and newer are common to come slightly unplugged and the 97 and older are common for melting.

[popsmick12]

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.

[DC3LANGTRY]

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.