Electronic Throttle Control System

NOTE: The spark control system is integral with the electronic throttle system. A solenoid mounted on the carburetor is energized whenever the A/C compressor, Electronic Backlite (EBL) or electronic timers are activated. The electronic timers used in the ignition system operate when the throttle is closed (plus a time delay of 2 seconds) or after an engine start condition.

Connect a tachometer to engine. Start engine and run until normal operating temperature is reached. Depress accelerator and let up. A higher than curb idle speed should be seen for the length of the EGR timer.
On vehicles equipped with A/C, turn on A/C and EBL. Depress accelerator pedal momentarily. This should cause a higher than normal curb idle speed. Turning the A/C and EBL off, should cause a normal curb idle speed.
If speed increases do not occur, disconnect 3-way connector at carburetor. Check the solenoid with an ohmmeter by measuring the resistance from Black wire terminal to ground. If resistance is not between 15-35 ohms, replace the solenoid.
Start vehicle and measure the voltage of the Black wire of 3-way connector before the delay times out. The voltmeter should read charging voltage. If not, replace SCC computer.
Turning on the A/C or EBL should also produce a charging system voltage on the Black wire of the 3-way connector after the delay has timed out. If not, check the wiring to the instrument panel for an open.