System Testing: Supra
- Using a "T" connector, connect a vacuum gauge to hose between distributor main diaphragm hose and pipe. Using another "T" connector, connect another gauge to hose between distributor sub-diaphragm hose and pipe.
- Check that coolant temperature is below 113°F (45°C). Start engine. Check that sub-diaphragm gauge indicates steady vacuum when engine is accelerated or running at idle.
- Warm up engine to normal operating temperature. Check that both gauges indicate zero vacuum.
- Increase engine speed to 1500 RPM. Check that sub-diaphragm vacuum gauge indicates high vacuum. Fully open throttle. Check that both gauges indicate high vacuum. Remove gauges and reconnect hoses.
- Remove distributor cap and rotor. Apply vacuum to diaphragms checking that vacuum advancer moves. Reinstall cap and rotor. If system performed as described, testing is complete. If not, check individual components as necessary.
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