Tech B spark tester is correct.
A spark plug tester is a handy tool that allows you to check if your spark plug is working properly. It can also save you time by allowing you to check if the problem is actually in your ignition. Follow these guidelines for an easy way to use a Spark Plug Tester.
Spark plug misfire, or spark miss, is when the sparks jumping the gap of the electrodes are inconsistent in their timing. This can cause your engine to stumble, lose power, and even emit black smoke (due to unburned fuel not being ignited in the combustion chamber). The following steps can be taken to check if you are experiencing spark plug misfire.
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