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Test NF-10A - Checking Engine Vacuum

Connect a vacuum gauge to engine. Start engine and let it idle. Normal vacuum reading will vary depending on altitude. Observe vacuum gauge reading at idle. If vacuum gauge reading is not a steady 13-22 in. Hg of vacuum, perform TEST NF-11A  . If vacuum gauge reading is a steady 13-22 in. Hg of vacuum, test is complete.

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