Land Cruiser
- Connect a vacuum hose to distributor main advance diaphragm hose. Check that coolant temperature is below 86°F (30°C). Start engine. Vacuum gauge should indicate zero when engine is accelerated or running at idle.
- Warm up engine to normal operating temperature. Pinch hose between vacuum pipe and vacuum transmitting valve (VTV). Increase engine speed to 2500 RPM and release hose. Vacuum gauge should indicate high vacuum within 2-5 seconds after releasing hose.
- Remove hose from VTV on vacuum pipe side. Vacuum gauge reading should drop rapidly to zero. Remove vacuum gauge and reconnect hoses.
- Remove distributor cap and rotor. Apply vacuum to diaphragms checking that vacuum advancer moves. Reinstall rotor and cap. If system performed as described, testing is complete. If not, check individual components as necessary.
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