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



Fuel Metering ^ Plugged fuel injectors
^ Injector drive circuit harness, connector and terminal
^ Perform injector balance test,
^ Perform injector service (cleaning)