Motorcraft Home Technical Resources Home Non-Subscription Resources What's New Body Repair Manuals Diagnostic Tool Support OBDII Theory & Operation Paper/CD Manuals Quick Guides Tools & Equipment Membership Accounts My Shopping Cart Subscription Products Keycode Lookup Reprogramming & Initialization Service Publications Technical Service Bulletins Technical Training Purchase Subscription Ford Specific Acronyms # A  B  C  D  E  F  G  H  I  J  K  L  M  N  O  P  Q  R  S  T  U  V  W  X  Y  Z  0-9  (Indexed by Abbreviation) Acronyms Description NA Naturally Aspirated. An engine that is not supercharged or turbocharged. NC Normally Closed NGS New Generation Self-Test Automatic Readout (STAR) tester. NO Normally Open NOX Oxides of Nitrogen. Gasses formed at high combustion temperatures. NPS Neutral Pressure Switch or its signal input to the PCM.

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