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)

Or, hide this message: temporarily or permanently

Symptom Related Diagnostic Procedures

TROUBLE JUDGEMENT BY SPARK PLUG CONDITIONS

PURPOSE
By checking condition of the spark plugs, judgement whether problem is related to a specific cylinder or all cylinders is possible.

PROCEDURE
1. Remove the spark plug.
2. Check condition of the spark plug.
3. Go to appropriate troubleshooting chart referring to the list below.