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

Testing for Spark


Spark Test




1. Disconnect the high-tension lead from the spark plug.




2. Hold the lead 5-10mm (0.20-0.39 in) from a ground.
3. Crank the engine and verify that a strong blue spark is visible.