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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System Diagnosis - Secondary Testing

1. Connect engine analyzer to view parade display of ignition system secondary.

2. While slowly increasing engine speed from idle to 2,000 rpm, compare engine analyzer display to the parade displays below.

Secondary Diagnosis:




Secondary Diagnosis:






SPARK PLUG DIAGNOSIS

Spark Plug Diagnosis:







1. Remove spark plugs, and inspect them for carbon deposits and damage. Ensure spark plug gap is at correct specifications.

2. If plugs are satisfactory, reinstall and check for a mechanical or fuel system problem.

3. If plugs are not satisfactory, clean or replace as necessary.