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

Backfires

Check the following:

1. EGR valve operation.
2. Ignition coil output--secondary--voltage.
3. Spark plugs, spark plug wires or distributor cap for crossfire.
4. Intermittent fault in primary ignition system.
5. Ignition timing.
6. Spark plugs.
7. Spark plug wires.
8. AIR check valve.
9. Valve timing.
10. Valve train parts--broken or worn.