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

Ignition System: Description and Operation

There is only one mode of operation in this ignition system. The PCM sends timing signals to the IC module. The IC module will then amplify and send a signal to the ignition coil which will produce high voltage secondary energy. This high tension voltage will then be distributed through the coil high tension wire, distributor rotor, cap, and plug wires. Since the distributor has no influence on the base timing, adjusting the distributor will not change it. However, the distributor on V8 applications can be adjusted to eliminate the chance of crossfire at the distributor wire terminals. Distributor terminal crossfire may cause poor performance. The V6 engine applications do not use an adjustable distributor.