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

Test 5, Spark Plug Check


1. Remove spark plugs, and inspect them for carbon deposits and damage. Ensure spark plug gap is .039-.043 inch.
2. If plugs are satisfactory, reinstall and proceed to Test 6.
3. If plugs are not satisfactory, clean or replace as necessary.