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Home >> GMC >> 1991 >> Value Van 7.4 N >> Repair and Diagnosis >> External Pages >> Different car >> Section 29 (Engine Controls - Tests W/Codes - 3.3L 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 Plymouth Voyager, 1995 Plymouth Grand Voyager, 1995 Dodge Grand Caravan, and 1995 Dodge Caravan. However, it is still accessible from the selected car via links, so may be relevant.

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

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