Make sure the battery clips are firmly connected to the battery terminals. Troubleshooting If the timing light fails to operate or operates erratically, make the following checks: 1. ![]() Compare this value with the manufacturer's specifications for vacuum advance. The difference between the reading obtained in step 3 and the value obtained in step 5 is the vehicle's vacuum advance. Aim the timing light at the timing marks and press the Advance Increment and Advance Decrement switches, as necessary, until the timing marks are realigned to the initial (base) timing mark as recorded in step 3. While performing an INITIAL (BASE) TIMING CHECK as previously described, slowly increase engine speed to the manufacturer's specified rpm for mechanical/centrifugal advance, and observe the rotating timing mark for change. Press the Zeroing Switch if necessary to obtain 0 degree indication. MAKE SURE the timing light Advance Display shows 0 (zero) degrees. Using Your Timing Light Checking Mechanical/Centrifugal Timing Advance 1. If the readings are within the specified tolerance (typically ☒°), ignition timing is correct. ■ Compare the readings obtained in step 7 with the manufacturer's specifications for timing. Note the position of the rotating timing mark in relation to the reference pointer. Adjust the timing light barrel, as needed, to adequately light the timing marks. Clamp the inductive pickup clip around the No. DO NOT CONNECT THE TIMING LIGHT WITH THE ENGINE RUNNING OR WITH THE IGNITION ON. Using Your Timing Light TIMING LIGHT CONNECTION To ensure personal safety and reliable operation of the timing light, use the following procedure to connect the timing light: WARNING! Always keep hands, timing light, lead wires and clips away from moving engine parts and hot surfaces. Refer to your vehicle’s service manual for proper connection of vacuum hoses, electrical wiring, and wiring harness connectors. Loose or dam-aged hoses, wiring, or electrical connectors are often responsible for poor engine performance. 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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