Test NTC-12A - Checking Engine Vacuum
WARNING: This page is about a different car, the 1995 Jeep Wrangler, 1995 Jeep Grand Cherokee, and 1995 Jeep Cherokee. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Perform TEST NTC-1A
before proceeding with this test. Perform TEST VER-2A
after each repair.
Connect a vacuum gauge to engine. Start engine, and let it idle. Normal vacuum reading will vary depending on altitude (normal vacuum reading is 13-22 in. Hg at sea level). Observe vacuum gauge at idle. If vacuum gauge reading is not stable at 13-22 in. Hg, perform TEST NTC-13A. If vacuum gauge reading is stable at 13-22 in. Hg, engine vacuum is normal. Test is complete.