Spark plugs are the heart of your car’s ignition system. If yours are worn out, new ones can dramatically improve your performance. See how to replace them here.

But spark plug reading—the traditional way to check your fuel mixture and monitor other vital conditions in the combustion chamber such as detonation, ring seal, and ignition advance—may be a ...

Q: I got a pretty good shock from one of my Toyota Camry’s spark-plug wires. I didn’t think much about it at the time other than to never touch them again when the engine is running.

Routing the wires is critical to prevent damage from exhaust heat, and headers can often add to the problem. The MSD multi-angle spark plug boots can be safely bent to a 90-degree angle, but even ...

MSD claims its Pro-Heat Guard has a core that can resisttemperatures up to 1,000 degrees F. There's an answer to this dilemma: a spark-plug-wire sleeve.

8 Autolite XP Iridium spark plugs XP103 $63.60 MSD Blaster 2 Coil-on-Plug coils 82428 $348.95 ...

A little dab’ll do ya Before replacing the coil, add a dab of dielectric grease to the tip prior to installing it over the spark plug terminal. Plug it back in to the ignition wires.