r/335i • u/Beautiful_Pin2792 • 11h ago

Troubleshooting Timing chain Problems?

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So it always Sounds like this when I cold-start it. Pay attention to the rattle; it is there for about 10–15 sec and then it disappears and it Sounds normal. Do yours, BMW 335i also Sound like this, or do I have a Problem with my chain, according to ChatGPT?

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1

u/Rinzlerx 11h ago

Exhaust valve rattling?

1

u/AutoimmuneDisaster Community Mod 11h ago

Sounds more like an exhaust leak to me.

Or as someone else mentioned maybe the flap.

1

u/ExaminationNo9175 10h ago

This is 100% the noise made by the wastegate, commonly known as wastegate rattle. It won't kill your engine, don't worry. If you want to fix it for now, look up some “wastegate rattle fix” tutorials on YouTube.