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Home >> GMC >> 1991 >> Value Van 7.4 N >> Repair and Diagnosis >> External Pages >> Different car >> Section 41 (Engine Controls - Tests W/Codes - 5.9L Gasoline) >> Self-Diagnostic Tests >> Test NTC-14A - Checking Engine Vacuum

Test NTC-14A - Checking Engine Vacuum

WARNING: This page is about a different car, the 1995 Dodge Ram Wagon, 1995 Dodge Ram Van, 1995 Dodge Pickup, and 1995 Dodge Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

Connect a vacuum gauge to engine manifold vacuum source. Start engine. Allow engine to idle. Normal vacuum reading will vary depending on altitude. Observe vacuum gauge at idle. If vacuum gauge reading is steady 13-22 in. Hg, engine vacuum is normal. Test is complete. If vacuum gauge reading is not steady 13-22 in. Hg, perform TEST NTC-16A.

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