You can, and should, actually read your spark plugs for valuable "clues" about how your engine is operating.

1 Spark plugs with light tan or gray color deposits usually indicate a sound engine and ignition system. Plugs within this color range can have normal electrode wear of about. 005-to. 008-inch ...

Being able to read spark plugs has always been considered "black magic" of sorts for many, but properly reading a spark plug is a must for any kind of performance tuning.

It might seem like a simple task to some, but spark plugs can often be overlooked during routine maintenance. Checking them is just as important as changing your oil. Not only do fresh, properly ...

Then again, how often to replace the spark plugs will depend on many things; like the type of spark plug, the vehicle's operating conditions, the type of gasoline used, and the odometer reading.

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