Typhoon V6-262 4.3L Turbo (1993)
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If low or no vacuum exists at the actuator determine whether the cause is the vacuum harness or the vacuum valve.
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Check the vacuum harness first.
4. Vacuum harness circuit check:
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Disconnect the vacuum harness at the control head.
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The green line should show engine vacuum; if not, trace back through connector to vacuum tank.
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To check any individual circuit, place the selector lever at the involved circuit position and check for vacuum presence.
