Fuel Cut System

Fig. 19 Fuel cut system schematic. 1985 - 86 models:

Fig. 20 Fuel cut system schematic. 1987 - 88 Models w/automatic transmission:

Fig. 21 Fuel cut system schematic. 1987 - 88 models w/manual transmission:

This system consists of a solenoid valve mounted in the primary idle circuit of the carburetor, Figs. 19, 20 and 21. The solenoid valve cuts off fuel supply to prevent dieseling when the ignition is shut off, and to improve fuel economy and reduce catalyst overheating during deceleration.
Fuel supply is cut when the following conditions are met:
a. Coolant is at normal operating temperature.
b. Clutch is not depressed (switch off).
c. Throttle closed (idle switch on).
d. Engine speed above 2500 RPM.

Fig. 22 Manually operating idle microswitch lever:

1985 - 86 Testing
1. Check that fuel cut solenoid valve clicks when ignition switch is turned on and off without starting engine.
2. Start engine and allow to reach normal operating temperature.
3. With transaxle in neutral and clutch engaged, increase engine speed to 3000 - 4000 RPM. Manually operate idle microswitch and observe RPM change, Fig. 22.
4. Perform same check with clutch pedal depressed. Engine RPM should not change.