1 UVCH unplugged truck runs better.

[94stroke]

94' f250 7.3 powerstroke.



Ok few weeks ago i started my truck and it started fine, ran fine. after warm up i started going forward and it started running like **** and threw the CEL. Ive been reading on here about the UVCH. Everyone on here with that issue seems to have no change when it is unplugged or the truck dies. Mine started running better and the CEL went out when i unplugged drivers front plug. Its not 100% but alot better than with it plugged in.

Anyone know how to diagnose this problem or what it is?

Drivers side bank had oil in the UVCH plugs.

[EPA Special]

my truck did the exact same thing. what you need to do now is remove your valve cover and look at the wiring harness. the reason mine did that is bc my glow plug shorted out and caused the PCM the drop the whole side of the motor. but when you unplug it it doesnt register so your running on 6 of the cyl. instead of 4. so check and see if your UVCH is burned up or anything. have you had a problem with blowing fuses?

[94stroke]

Originally Posted by EPA Special

my truck did the exact same thing. what you need to do now is remove your valve cover and look at the wiring harness. the reason mine did that is bc my glow plug shorted out and caused the PCM the drop the whole side of the motor. but when you unplug it it doesnt register so your running on 6 of the cyl. instead of 4. so check and see if your UVCH is burned up or anything. have you had a problem with blowing fuses?

Yea i figured the part out about droping the whole bank of cylinders. i need a garage! -25 out sucks to try anything to fix a vehicle.

What makes me feel good, is the damn truck starts with -25F with 2 dead cylinders.

[EPA Special]

haha true. its nice and sunny here in FL!