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Home >> GMC >> 1991 >> Value Van 7.4 N >> Repair and Diagnosis >> External Pages >> Different car >> Section 31 (Engine Controls - Tests W/Codes - 3.3L CNG) >> Self-Diagnostic Tests >> Test NTC-15A - Checking Engine Vacuum

Test NTC-15A - 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. Operate engine at idle. Observe vacuum gauge reading with engine at idle. Normal vacuum reading will vary according to altitude. If vacuum gauge reading is not 13-22 in. Hg steady, go to TEST NTC-16A. If vacuum gauge reading is 13-22 in. Hg steady, engine vacuum is okay. Test is complete.

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