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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Test Step 5


Ignition Secondary Pattern:






^ Consistently high spark plug firing voltage in one or more cylinders.

^ Possible causes:
- Spark plug wire(s) not firmly connected to distributor cap or spark plug.
- Disconnected spark plug wire(s).
- Wide spark plug gap(s).
- Open plug wire(s).

^ GO to Test 3. Test 3 - Spark Plug Wire Resistance