95 only runs on 4 cylinders.

[nightmare95]

i bought my 95 last spring, and about once a month the truck would run on 4 cyl for about half a minute then run on all 8 again. It would be good for another month or two then it would happen again for a brief time then run normal again.

Anyways. my truck now only runs on 4 cylinders all the time. I changed the IDM with a swamps IDM. and now i don't know what to change out next. The strange thing is that the drivers side is the only 4 that fire. so the whole passenger side of the engine is dead.

Any help would be appericated.

[dhanna6powerstroke]

Under Valve Cover Harnesses (UVCH) is most likely the problem. IDM probably wasn't bad.

[nightmare95]

Is there any way of testing if there bad or not? I have some from a 95 parts truck but I think a couple of those are bad as well.

[dhanna6powerstroke]

I'm sure there is but I personally don't know how.

[creekfreak]

Pull the valve cover on the dead head. Check the connections on both sides. From my understanding they will short/burn out frequently. I lost 2 cylinders last week, popped the cover and it was quite apearent that it had bricked itself. I just scored a couple off amazon for a really good price but shipping was slow (took about 2 weeks to get here). They hadn't arrived by the time this problem happened and I picked up one from my local napa for $78.... Less then many online sources but more then what I paid for on amazon ($47). Now ill have an extra waiting for Armageddon to happen.
It's a pretty painless job except for the very back valve cover bolt on the P side.

[CT Performance, Inc.]

The UVCH can also become unpluged when they get old and stiff..sounds like your issue.....Ford has a clip so this won't happen again..its like $5

[nightmare95]

The rear uvch plug melted to the vc harness. Lucky I had plugs and harness from my parts truck.
Thanks for the help guys.

[creekfreak]

Cool. Easy fix!