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Checking Engine Vacuum

NOTE: Normal vacuum readings vary according to altitude.

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

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