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 and Afterfires
SYMPTOM:Fuel ignites in the intake manifold or in exhaust system making a loud popping noise.
POSSIBLE CAUSE ACTION EGR open all the time
Check
EGR system in "Testing Procedures" in Emissions
Leaking
EGR gasket
Air management valves
Check
Air Injection system in "Testing Procedures" in Emissions
Deceleration valve Check valves for proper function.