Quote:
Originally Posted by dtxscott
Simply unplug each spark plug one at a time with the engine running. If the idle stumbles or changes, that cylinder is functioning
If the idle is unchanged when pulling the plug wire, that cylinder is no bueno.
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I strongly recommend against this. Experiencing 30,000 volts is an interesting experience. It teaches you to never touch the ignition system of a running engine.
The timing light method is a good one. As is the infrared thermometer method. Every tool box should have both these tools.