Compression Check: Testing and Inspection

1. Start and warm engine to operating temperature.
2. Remove all spark plugs and apply a few drops of engine oil into spark plug holes.
3. Relieve fuel system pressure as outlined under Precautions.
4. Disable ignition system, by removing ignition fuse.
5. Connect a tachometer and crank engine, ensure cranking speed is 300 RPM or higher.
6. Install compression gauge, then crank engine with throttle wide open.
7. Minimum pressure should be 114 psi, and all cylinders should read within 70 percent of each other.