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Test NTC-5: Checking Engine Vacuum

  1. Connect vacuum gauge to engine vacuum source. Start engine and allow engine to idle. While monitoring engine vacuum reading, quickly open and close the throttle several times and then allow engine to idle. Note engine vacuum reading with engine idling.
  2. Engine vacuum should be steady and 13-22 in. Hg depending on the altitude with engine at idle. If engine vacuum is within specification, test is complete. If engine vacuum is not within specification, perform TEST NTC-4: CHECKING ENGINE MECHANICAL SYSTEMS  .
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