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

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Ignition Timing

Ignition Timing:





Optimum ignition timing is calculated in the control module on the basis of the following information:



^ engine load (Tq)


^ engine speed

The throttle position (at idle) also provides the basic ignition timing and, where appropriate, a knocking tendency in any of the cylinders will naturally also influence the control module's calculation of optimum ignition timing.