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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Ignition Cable: Testing and Inspection

SPARK PLUG CABLES TEST
1. While the engine is idling, disconnect each spark plug cable one at a time to check whether the engine's running performance changes or not.

WARNING: A suitable pair of industrial rubber gloves should be worn when disconnecting the cables. Do not use household cleaning gloves.

2. If the engine performance does not change, check the resistance of the spark plug, and check the spark plug itself.
3. Check the cap and outer shell for cracks.







4. Measure the resistance.

NOTE: Resistance should not be higher than 10,000 ohm-per foot of cable. If resistance is higher, replace the cable.