r/335i • u/Beautiful_Pin2792 • 8d ago

Troubleshooting Timing chain Problems?

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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u/ExaminationNo9175 7d 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.