Operation CHARM: Car repair manuals for everyone.
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the logical successor to CHARM, I recommend you try it!

Link: lemon-manuals.la

Compression Check: Service Precautions



COMPRESSION TESTING
When performing a compression test, remove the fuel pump relay fuse and disconnect power to the ignition. This will stop fuel flow to the injectors and prevent engine from starting.