Page 1 of 3: How to do an Engine Compression Test on Ford 4.6L and 5.4L V8 vehicles. Diagnosing Misfire Codes: P0300, P301, P0302, P0303, P0304, P305, P0306, P0307, P0308. Ford 4.6L and 5.4L cylinder compression tests. Automotive diagnostic tips and techn
How many miles are on the motor? I wouldn’t rule out the timing chain jumping a tooth.