Misses Under Load

Definition: Steady pulsation or jerking that follows engine speed, usually more pronounced as engine load increases. The exhaust has a steady spitting sound at idle or low speed.

POSSIBLE CAUSE ACTION

Contaminated fuel ^ Drain fuel tank and add clean fuel

Restricted fuel filter/line ^ Replace filter/repair restricted line

Low fuel pressure ^ Test fuel pressure, refer to FUEL SYSTEM DIAGNOSIS

Fuel Metering ^ Plugged fuel injectors, perform INJECTOR BALANCE TEST
^ Perform injector service (cleaning), refer to MAINTENANCE PROCEDURES