I'm new to the forum, but have been lurking for awhile and learning alot from it.
I have a 95 Powerstroke F350 and it started running rough all of a sudden. It was running fine and getting about 17 mpg, until last week when I got in to go to work. The truck had a different sound idling, idling slower than normal and the engine sounded like it had a miss through all rpm's. I got home and found the passenger's side vc gasket and the internal and external glow plug pin were melted. I got a new vc gasket and both connectors from the International dealer and replaced them, thought my problem was fixed. However the truck is still running like it has a miss? I checked the ICP by unplugging it to see if the idle would smooth out, it didn't. Checked all of the wiring connectors and harness to CPS, IDM, injector harness, idle sensor on the peddle, etc., did not find anything wrong. The check engine light has not come on, but I reset the ECM after unplugging all the connectors by unhooking the battery for 10 min.
Fresh fuel filter, oil filter, new serp belt, K&N intake, new 3" downpipe w/ 4" straight exhaust, new Optima Yellowtops and battery clamps, etc., all done less than 500 miles ago, the truck was running perfect!
I really don't know where to check next? Can bad glowplugs make it run rough in the middle of summer?