This is the thread I was looking for. I have a 1985 F250 4x4 Diesel four speed. I changed the oil when I got it last summer about 1800 miles ago. A couple weeks ago I noticed the engine temp light slowly coming on, the gauge read fine and there were no signs under the hood that it was getting hot. One day while driving to town, the engine suddenly started to get louder, kind of a diesel knock kind of a sound, and then the RPMs took off to the moon. I stabbed the throttle a couple times and it returned to normal sound and RPMs but it didn't seem that pumping the throttle is what fixed it. I got home and parked it for several days and kind of forgot about it. One day I needed it for some chores and to check cattle. I'd had it running for about an hour and as I was driving back to the shop, it ran away twice more. Neither time was bad but it's obvious something is wrong. When I got to the yard, I popped the hood and pulled the dipstick, it was way overfull, all the way over the twists in the dipstick. I know that when I did the oil change it was left about a half a quart over full because I stopped short on oil and put a little Lucas in it. After reading everything here it looks like I'm leaking fuel into the crankcase and it got full enough to push it up past the rings and start a runaway. Does this sound accurate? Is it likely that I have a problem injection pump that is filling up my crankcase? What kind of money are we talking for an injection pump? This pickup does have CC that doesn't seem to work but I haven't been under the hood to disconnect that from causing future problems, it's about eight degrees out and the wind is blowing 30, I think I'll wait for better weather. I have an '86, same configuration, that's plugged in and ready to go for chores in the morning. I like these older diesels, but I do keep spare pickups around for occasions like this.