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)

Or, hide this message: temporarily or permanently

Spark

Range -96 to -255 Degrees
The Spark Advance is a display of the spark advance calculation which the VCM is provided to the Ignition Control Module. The VCM calculates the desired spark advance using data such as engine temperature, RPM, load and vehicle speed.