BMW E39 530i Engine Noise

[@JulzWinfield]

I know this is a old post but if anyone else is experiencing the same sound it’s definitely your belt tensioners. Which one? Just do both and while you’re at it do the belts and pulley’s. It will definitely fix the problem. I always thought the belts would screech if pulleys or tensioners were bad but I guess I was wrong. 🤷🏻‍♂️

[@yazanburghol8888]

Did u solve it buddy ? I have the same

[@eligaffke57]

Yeah, it was the actual tensioner that was the problem. I had at first just changed the pulley on the tensioner. Once I changed the tensioner it fixed it. There are two tensioners also. So I ended up doing both.

[@EduardoTorres-wo1hd]

Disa valve more than likely. Recommend servicing Spark plugs, Coils, Cabin air filters, Intake filter, Oil change Also try guaranteed to pass smog liquid soulution. Found at local auto parts retailers

[@EliGaffke]

None of those had any bearing on that sound. DISA was the first thing the dealer checked when they helped me with, the mechanic actually checked a few things and talked to me for awhile on the service lane and didn't charge me anything. He was stumped and he had been working on these cars since they were new and before this model. Turned out it was the tensioner for the belts.