Fuel Cut-Off

Injectors are de-energized when ignition is turned off so that dieseling is prevented. Injectors will not be energized if RPM reference pulses are not received by the ECM, even with ignition on. This prevents flooding before starting. Fuel cut-off will also occur at high engine RPM to prevent internal damage to engine. Some fuel injected models may also cut off fuel injector signals during periods of high speed, closed throttle deceleration (when fuel is not needed).