Generally, an upper engine noise issue will be a ticking sound, while a lower engine noise will be associated with a knocking sound.

Is that knocking sound your engine is making just a case of low-octane fuel, or is it something more serious? The answer is crucial for your engine's health.

If you hear a knocking sound coming from your diesel engine, the most likely culprit is the fuel injectors. If the fuel injectors are not properly lubricated, they can mistime the fuel releases ...