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Vacuum Advance Correction: Testing

  1. Disconnect hose from vacuum advance mechanism on distributor and connect a vacuum gauge. With engine idling at normal operating temperature, vacuum should be low. As engine speed is increased, vacuum should increase.
  2. Disconnect electrical lead from oil thermal switch (right side of oil pan). Connect lead to ground. No vacuum should be present on vacuum gauge. Reconnect lead wire.
  3. On air conditioned vehicles, turn on air conditioning so compressor operates. Gauge should indicate vacuum greater than 12 in. (300 mm) Hg.
  4. If system operates as described, reconnect advance hose. If not operating properly, check oil thermal switch. When temperature is below 59°F (15°C), switch should have continuity between terminal and ground. Above that temperature, there should be no continuity.
  5. If system still does not operate properly, check electrical connections to switching relay and distributor.
    Fig 1: Le Car Vacuum Advance Correction System
    G09324621Courtesy of AMERICAN MOTORS/RENAULT CORP.
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