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
Engine Speed Signal
HEI Wiring Diagram:
The engine speed signal comes from a seven terminal High Energy Ignition (HEI) module in the distributor along CKT 430 (DIST REF). Pulses from the distributor are sent to the PCM/ECM where the duration between these pulses are used to calculate engine speed. The PCM/ECM adjusts spark advance and sends a signal back to the distributor.
