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
Fuel ignites in the intake manifold, or in exhaust system, making a loud popping noise.
POSSIBLE CAUSE ACTION EGR open all the time,
1. Check EGR system under
leaking gasket
TESTING PROCEDURES.
2. Check
EGR electronic controls.
Refer to COMPUTERIZED ENGINE CONTROLS.
Air management valves,
Check Air Injection system under
Deceleration valve,
TESTING PROCEDURES.
Check valves malfunctioning