Mariner 4WD L4-2.3L VIN Z (2005)
2. If compression does not improve, valves are sticking or not seating correctly.
3. If two adjacent cylinders indicate low compression pressures and squirting oil on each piston does not increase compression, the head gasket may
be leaking between cylinders. Engine oil or coolant in cylinders could result from this condition.
Use the Compression Pressure Limit Chart when checking cylinder compression so that the lowest reading is within 75 percent of the highest
reading.