GM Metro/Sprint 1985-1993 Repair Guide

Fuel Cut System



The fuel cut solenoid valve is provided in the primary flow system of the carburetor to open and close the fuel passage. Turning the ignition switch OFF cuts off the electric current to the solenoid, the solenoid then closes the fuel passage. Thus, this system contributes to prevent engine run-on. Also, during deceleration and provided that the coolant temperature is normal, the engine rpm is greater than 2000, the clutch switch is OFF (clutch pedal is not depressed) and the idle switch is ON (primary throttle valve is closed).


See Figures 1 and 2

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Fig. Fig. 1: Fuel cut solenoid

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Fig. Fig. 2: Depressing the the idle micro switch lever

System Inspection
  1. Make sure that fuel cut solenoid valve makes a clicking sound when ignition switch is turned to ON or OFF without cranking the engine.
  3. Warm up the engine to normal operating temperature.
  5. With clutch engaged (manual transaxle), increase engine speed to 3000-4000 rpm. Under these conditions, check to be sure that engine rpm changes when idle micro switch lever on carburetor is moved.
  7. Perform the same check with clutch disengaged (clutch pedal depressed). Engine rpm should not change.