Pigman

Compression test was good! 13bar in all 4 cylinders. Have put 4 new spark plugs on and just driven to the shops and back with no issues! So it looks like my bro was wrong and it doesn't need a new engine. Perhaps I was lucky and have got away with just a bit of surface damage. Cheers for the help

Had a look inside with a Borescope and took these pictures. Definitely some marking on both the valves and the pistons but nothing on the cylinder walls, bad enough to warrant replacing the valves? Not a small job! Also no sign of the piece of spark plug! Working theory is that it's been smashed up inside the cylinder and blown out the back. Next step is to do a compression test.

Thanks. I'm hoping no major damage was done as I only drove a couple of miles with the noise. Gonna try and find a long thin magnet and see if that can fish it out. Plus it gives my bro an excuse to buy a borescope! Will let you know what we find...

Afternoon all, is this as bad as I think it is? Bad noise, check engine light, error codes P0300, P0302, P0303. Changed ignition coils on cylinders 2 and 3 which didn't solve the problem so checked the spark plugs. Spark plug on cylinder 2 was missing the tip! It appears to have broken off while in use! The spark plugs were changed 2.5 years ago with Bosch ones. Picture of broken spark plug and video of bad noise attached. Is my brothers diagnosis of "might need a new engine" an accurate one? I'm hoping I can fish the piece out with a long thin magnet, stick a new spark plug in and then everything will be good as new again! Car is a Golf 1.4TSI mk7.5 with the CZCA engine. Cheers WhatsApp Video 2026-08-30 at 15.38.49.mp4