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 spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

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Ignition System: Description and Operation

Fig. 1 Ignition System.:






Three-cylinder engines timing is based on input from the ECU which gathers data from various sources such as manifold pressure, RPM, etc and sends the correct timing signal to the ignition system, Fig. 1.