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

FG7 - Check For Modification Decal



- Is there a modification decal attached to vehicle Indicating that OCT ADJ shorting bar was removed?

YES -- Go to FG10. FG10 - Check Octane Adjust Circuit For A Short to Ground

NO -- REPLACE snorting bar. RETURN to Symptom Flowcharts to address spark knock concern. Testing and Inspection