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
Deceleration Spark Control System
The deceleration spark control system decreases hydrocarbon emissions during vehicle deceleration by advancing the
ignition timing. Timing is advanced by a solenoid operated vacuum valve on the
distributor. The solenoid changes vacuum supplied to the valve from ported (carburetor) to full manifold vacuum. The solenoid valve is controlled by the ECU based on engine speed.