Because spark plugs fire in a specific order, it’s imperative that each electrical wire is attached to the proper spark plug when you’re done. To make this job easier, just take your time and check ...

Attach the spark plug to a spark plug tester, then connect the tester to the ignition wire. Start the engine and observe the ...

Though small, spark plugs play an important role in getting your vehicle started and keeping it running—so when they’re past their prime, you’re going to want to replace them.

In this video, I show you how to test spark plugs and coils on any car, even if the spark plugs are recessed or hard to reach. Whether you're troubleshooting engine misfires, poor performance, or ...

A maintenance routine that includes servicing the spark plugs, air filter and engine oil helps keep your lawn mower running at peak performance.

Read a good spark plug lately? We hope so, for your engine's sake. But spark plug reading—the traditional way to check your fuel mixture and monitor other vital conditions in the combustion ...

Using a plug light when examining spark plugs is very important. The light, which costs from $15 to $40, allows you to see deep into the plug for vital details.

Read our expert, in-depth guide on how to check and change spark plugs on your motorcycle with MCN - one of the most important components in any petrol engine.

Proven technology applied in a new way allows this Hyundai ignition system to monitor spark plug wear without a physical inspection.

You can use a multimeter to test the resistance to be sure. Q: How Can You Tell if a Spark Plug Is Firing? A: The grounding test is performed to determine if a plug is firing.