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)

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Distributor: Adjustments

IGNITION TIMING

NOTE: Base (initial) ignition timing is NOT adjustable. Do not attempt to adjust ignition timing by rotating the distributor.

NOTE: Do not attempt to modify the distributor housing to get distributor rotation. Distributor position will have no effect on ignition timing.

All ignition timing functions are controlled by the Jeep/Truck Engine Controller (JTEC). For additional information, refer to the appropriate Powertrain Diagnostics Procedures for operation of the DRB Scan Tool.