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, refer to MAINTENANCE PROCEDURES/FUEL TANK DRAINING.

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

Low fuel pressure ^ Test fuel pressure
Proceed to DIAGNOSTIC CHARTS/FUEL SYSTEM DIAGNOSIS (CHART A-7).

Fuel Metering ^ Plugged fuel injectors
^ Perform injector balance test, refer to FUEL INJECTOR BALANCE TEST.
^ Perform injector service (cleaning)
Proceed to MAINTENANCE PROCEDURES