- Joined
- Jul 11, 2011
- Messages
- 660
- Reaction score
- 129
- Points
- 43
- Location
- Central Texas
- Vehicle Year
- 1992
- Make / Model
- Ford
- Engine Type
- V8
- Engine Size
- 5.0
- Transmission
- Manual
- 2WD / 4WD
- 4WD
My 1991 Ranger with 4.0 OHV 4x4 has a rough idle and very low compression on #4 cylinder. Put oil in cylinder and compression was the same. Rotated the crank to measure movement on the exhaust valve and it compares to other cylinders. The rocker arm had a 2mm depression worn in it so I replaced it which stopped the clatter at idle, but I still get some valve clatter at lower RPM. Feels strong on acceleration above 2000 RPM. I tried Seafoam in the oil for a little while and no change. I'm thinking the lifter is not pumping up but not sure. I'm trying all the low cost stuff first, so my next step is to replace the oil with ATF and run it for an hour or so. Any thoughts before I spend a $1000 on valve jobs, etc. ?
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