Celica Supra L6-2759cc 5M Ser (1982)
Distributor Vacuum Control: Testing and Inspection
1981 5M-E Engine
1. Connect vacuum gauge to distributor sub-diaphragm hose.
2. With coolant temperature below 122° F, start engine. The vacuum gauge should indicate high vacuum. If not, check BVSV and check valve.
3. Warm engine to normal operating temperature. Vacuum gauge should indicate low vacuum. If not, check the BVSV.
4. On 1981 5M-E engine, disconnect vacuum gauge and reconnect it to distributor main diaphragm. On 1981 vehicles, operate power steering or shift
transmission to drive; gauge should indicate high vacuum. If not, check VCV.
1981-82 3A-C Engine
1. Connect one vacuum gauge "A" to distributor main diaphragm hose and another gauge "B" to the BVSV port not leading to distributor
sub-diaphragm.
2. With coolant temperature below 122° F, start engine. Both vacuum gauges should indicate zero vacuum regardless of throttle position.
3. Warm engine to normal operating temperature. Vacuum gauge "B" should indicate high vacuum regardless of throttle position.
4. On 1981-82 3A-C Federal engine, pinch hose between VCV and VTV and vacuum pipe with engine at idle.
5. Increase engine speed to 2500 RPM and release the pinched hose. Vacuum gauge "A" should indicate high vacuum within 1-5 seconds.
6. Return engine to idle and check that vacuum gauge "A" returns to zero smoothly.
7. If system is not operating properly, check components individually.
1981-82 4K-C Engine
1. Connect one vacuum gauge "A" to distributor main diaphragm hose and another gauge "B" to the sub-diaphragm hose.
2. On 1981 vehicles equipped with HAC system, disconnect lower hose from HAC valve and connect it directly to intake manifold.
3. With coolant temperature below 106° F, start engine. Vacuum gauge "A" should indicate zero vacuum and gauge "B" should indicate intake
manifold vacuum regardless of throttle position.
4. Warm engine to normal operating temperature. Vacuum gauge "A" should read zero at idle and high vacuum when the throttle is open. Vacuum
gauge "B" should indicate high vacuum and fluctuate with changes in throttle position.
5. If system is not operating properly, check components individually.
1981-82 22R Engine
1. Connect vacuum gauge to distributor main diaphragm hose.
2. With coolant temperature below 104° F, start engine. Vacuum gauge should indicate zero vacuum regardless of throttle position.
3. Warm engine to normal operating temperature. Vacuum should vary in relation to changes in throttle position.
4. If system is not operating properly, check components individually.
1982 5M-GE Engine
1. Using 3-way connectors, connect one vacuum gauge "A" to hose between distributor main diaphragm and pipe, and another gauge "B" to hose
between the sub-diaphragm and pipe.
2. If coolant temperature is below 14° F, start engine. Vacuum gauge "A" should indicate high vacuum regardless of throttle position. If not, check
BVSV 1 and check valves.
3. If coolant temperature is 39°-113° F, start engine. Vacuum gauge "B" should indicate high vacuum regardless of throttle position. If not, check
BVSV 1 and 3 and check valves.
4. Warm engine to normal operating temperature. Both gauges should indicate low vacuum at idle. At 1500 RPM, gauge "B" should indicate high
vacuum. If not, check BVSV 3.
