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Andreas525d

E39 525d weird engine noise

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Hi, I’ve been trying to find the solution for a problem which I experienced for the past 2 years, with no luck. 

When I let off the gas there is a rattling noise coming from the engine and I am not sure what may cause it! Please see below 2 videos about the noise:

https://youtu.be/F-3yUV112Lg

https://youtu.be/pDix7icFH-U

 

Thank you for your help in advance!

Andreas

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It is a bit difficult to tell from the videos but perhaps something loose in one of the catalytic convertors? I had a similar noise when the flange of the CAT unit split from the pipe.

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Could be slack in the timing chain, have someone Rev it while you try and pin the noise down to an area in the engine bay, take the oil cap off and see if the rattle is internal 

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