Engine knocking, or detonation, occurs when fuel in the cylinders ignites unevenly, causing metallic pinging sounds, reduced power, and potential engine damage. Key causes include low-octane fuel, ...

I drive a 2009 Honda Pilot Touring 4WD. I hear some knocking when I start the engine. It eventually becomes relatively quiet after a minute or two. Would it be a good idea to start using synthetic oil ...

My Subaru Impreza – ‘03 RS model (2.5l) - has begun to make a knocking noise (similar to a diesel engine) during start up in the morning. It slowly fades as the car warms up. The only think I can ...

A knocking sound from the engine often triggers worst-case assumptions, but piston slap is a far more common—and usually less dangerous—culprit. It occurs when a piston lightly contacts the cylinder ...

You’d expect any noise from under a car’s bonnet to be caused by the engine, but if this noise occurs before you’ve started the engine, you’re on to a real mystery. Perhaps the noise can be heard as ...

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 ...

THIS is another chapter in the development of a quantitative knock-measuring apparatus. The first part of the paper describes tests in which the knock sound was picked up by a microphone located a few ...

You're tooling along on your way home from a cruise night or a car show when you pull up to a stop sign. As the engine drops down to an idle, you hear astrange sound from under the hood. It's not a ...

Q: I’ve got a 2005 Honda Accord V-6 with only 78,000 miles on it. I have changed the oil religiously according to the owner’s manual from the day I purchased it new. Within this last year it has ...

I have discovered an engine knocking noise and severe diesel blow-by problem in my 2015 Nissan X-Trail 1.6-litre diesel. Do we spend $10,000 for a second-hand engine and have that fitted? The car has ...