Throttle Opener Adjustment

This system is set at the factory and adjustment is not normally required. If adjustment is needed, proceed as follows:

1. With engine at normal operating temperature and choke fully open, connect vacuum gauge to intake manifold, and tachometer to engine. Disconnect wiring harness to throttle opener solenoid to ensure solenoid is OFF.
2. Place transmission in "P" or "N" (Auto. Trans.) or "N" (Man. Trans.). Increase engine speed to 3000 RPM under no load and release throttle rapidly.
3. Manifold vacuum should rise, causing control valve to operate. Following this, both speed and manifold vacuum should reduce. Speed and vacuum should stabilize after a few seconds. Manifold vacuum at this time is called "Operating Pressure".