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 Exhaust system leaks
Visual inspection
Incorrect Air-Fuel mixture
Check Air-Fuel ratio,
O2 sensor, perform injector balance test, inspect regulator operation (check vacuum line and return hose), check
fuel pressure EGR malfunction
Check
EGR system,
Exhaust Gas Recirculation