Compression Check: Testing and Inspection

1. Disconnect battery ground cables.
2. Disconnect No. 1 terminals on ignition coils.
3. Disconnect both fuel pump relays and reconnect battery ground cables.
4. Remove all spark plugs and install compression gauge.
5. Operate starter and depress accelerator pedal until compression reaches highest point.
6. Correct compression specification is 142-171 psi.
7. Maximum allowable deviation between cylinders is 7 psi.