That rhythmic knock under the hood could mean five very different things.

Cars make all kinds of noises, even when they're operating correctly. You turn the key and the engine fires up with a consistent and satisfying rumble. Horns beep, doors slam, and your car's interface ...

The demon of engine knock is something an owner of a traditional high-performance Pontiac knows all too well. An engine designed when 102-octane high test was at almost every fuel station in the ...