Compression Check: Testing and Inspection

1. Warm engine to normal operating temperature, then turn off engine.
2. Remove all spark plugs and disconnect ignition coil connector.
3. Connect a compression gauge to No. 1 spark plug hole.
4. Fully depress accelerator pedal and crank engine, record maximum gauge reading.
5. Repeat steps 3 and 4 for each cylinder, then compare readings in General Engine Specifications. Mechanical Specifications
6. If compression in one or more of the cylinders is low, pour a small amount of engine oil into cylinder and recheck compression. Check results as follows:
a. If compression increases, piston, piston rings, or cylinder wall may be worn.
b. If compression stays low, valve may be stuck or improperly seated.
c. If compression in adjacent cylinders stays low, cylinder head gasket may be defective or cylinder head distorted.

7. Connect ignition coil, then apply suitable anti-seize compound to spark plug threads and install plugs. Torque plugs to 11 - 17 ft.lb.