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Home >> Jeep >> 1998 >> Cherokee Classic, 2.5 P >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - Engine Performance >> Self-Diagnostic Tests >> Test NTC-4A: Checking Engine Vacuum

Test NTC-4A: Checking Engine Vacuum

NOTE: Normal vacuum reading will vary depending on altitude.

Connect a vacuum gauge to engine vacuum source. Start engine, and let it idle. Snap throttle open a few times. Observe vacuum gauge at idle. If vacuum gauge reading is not steady 13-22 in. Hg, perform TEST NTC-13A: CHECKING ENGINE MECHANICAL SYSTEMS (GASOLINE ENGINES) . If vacuum gauge reading is steady and within specification, engine vacuum is normal. Test passed.

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