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 ...

Piston slap can create a knocking noise from your engine that seems very concerning at first. But you should listen to expert ...

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 ...

I checked the catalytic converter and it's OK. The engine is knocking and making a sound at the tail pipe. Spark plug wires look loose. The car wasn't driven for a while. It's showing very poor gas ...

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 ...