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 ...

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 ...

It would be nice to think that carmakers would own up to problems with their cars, but they always seem reluctant to do so, and our consumer laws are so pathetic that there's no incentive for them to ...

Customers may be impressed with the fuel economy provided by either a four-cylinder or a diesel engine, but they may not be bowled over by the acoustic properties. To reduce -- or in some cases, ...

I own a diesel Vauxhall Astra (2005 model). When driving, the car judders as it pulls away and makes a knocking noise. The sound and judder stop when I push the clutch in. Any idea what could be wrong ...