Look at the tip of the removed spark plug. A spark plug should come out of an engine with a central electrode that's got a light gray or brown residue. It should be free from any oily or fluffy black ...

The Ancel Spark Plug Tester is 35% off at Amazon, but the sale ends soon. Put your car’s spark plugs to the test by ordering ...

A battery in a traditional car cannot directly create engine spark. It’s only rated at 12 volts, after all, so it needs a little help boosting the signal to the spark plugs. To make that happen, a car ...