Using Your Timing Light BEFORE YOU BEGIN Make a thorough check before starting any test procedure and fix any known mechanical prob-lems before performing any test. RPM Display - Shows current engine speed in revolutions-per-minute. Flash Switch - Push to turn strobe light on. Zeroing Switch - Returns LCD advance display to 0 (zero) degrees. Advance Decrement Switch - Decrements through degrees of advance. Advance Increment Switch - Increments through degrees of advance. Your timing light provides a simple and efficient means of checking your vehicle's ignition timing, and provides the additional ability to check the operation of your vehicle's mechanical or vacuum advance timing controls. An ignition system timing check is critical during any tune-up procedure. General Information ENGINE TIMING AND TUNE-UPS Proper ignition timing is critical in order to achieve peak engine performance and to ensure maximum fuel economy. FACTORY SOURCES Ford/General Motors Service Manuals Helm Inc. Be sure to include the make, model and year of your vehicle. Write to them for availability and prices. The following companies publish valuable repair manuals. Vehicle Service Manuals Contact your local car dealership, auto parts store, bookstore or public library for availability of service manuals for your vehicle. Safety Goggles Wear safety goggles when working on a vehicle to protect your eyes from battery acid, gasoline, and airborne dust and dirt from moving engine parts. Allow soaked rags to dry thoroughly in open air before discarding. Fireproof Container Store rags and flammable liquids only in fireproof containers. Safety Guidelines SAFETY EQUIPMENT Fire Extinguisher Keep a fire extinguisher suitable for gasoline/chemical/electrical fires on hand whenever working on a vehicle.
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