The correct ignition timing on an engine is critical for the engine to run properly. Basically the ignition timing determines when to fire the spark plug for each cylinder at the proper time in combustion engines.
First you will need to locate the #1 cylinder on the engine. This can be found in the shop manual for your particular vehicle and engine. On newer model Chevy engines you must locate and unplug the computer timing advance. Clamp the timing light lead around the #1 plug wire and hook battery power to the timing light.
Locate the timing marks on the harmonic balancer and mark with chalk or a white crayon. Start engine and point the timing light at the mark. The mark should align with the timing pointer. If it doesn’t then shut off the engine and loosen the distributor hold down clamp. Start the engine and move the distributor until the timing mark aligns with the timing pointer.
Tighten the clamp and recheck the timing.
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Locksmith
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