Welcome Visitor! Please take a few seconds and MikeSak
New Member
- Joined
- Jul 17, 2010
- Messages
- 14
- Reaction score
- 0
- Points
- 0
- Vehicle Year
- 1991
- Make / Model
- Ford
- Engine Size
- 4.0
- Transmission
- Manual
I bought a nice 89 Ranger XLT 4x4 2.9 manual everything a few months ago. I had to drive about 350 miles each way to get it. It ran perfectly fine during the test drive and for the first 100 miles on the trip back home. It started off just losing power at highway speed so I would just pull over for 5 mins and then it be at full power again for like 20 mins before having to pull over again. Well on about the 4th time pulling over to let it rest it was down a cylinder and shooting unburnt oil out of the exhaust and was obviously really down on power then. Eventually I had to get off the expressway and take the last 200-250 miles home on back roads, but it made it back on the 5 cylinders and a extra 5 quarts of oil. The next day I pulled the motor apart and found a piston melted through in one spot right on the very edge by the rings, the head cracked right between the valves, and the exhaust valve seal popped up all on cylinder #4. The engine never got hot and oil pressure was always good. It didn't even have the 2.9 tick. My theory is the fuel injector on cylinder #4 got clogged and caused the cylinder to go lean and run hot. What do you guys think happened?
