[deropke]

Noise: https://streamable.com/sfj9bj (might not be audible without headphones, sounds like birds in forest, but its my engine sadly )

It's most prominent when depressing gas, or when rolling downhill, but also often makes noise under acceleration. It's a little bit random, one day you can drive and not hear a thing, other day it will be loudest its ever been, tbh it seems like it's progressively getting louder.

No noise when idling standstill.

I'm thinking it's belt or pulley, any thoughts ?

[jwalker87]

How many miles are on the belt and pulleys?

[ky0u]

Completely off topic but how do you have an RHD/Euro model with an MPH cluster?

[deropke]

Originally Posted by ky0u

Completely off topic but how do you have an RHD/Euro model with an MPH cluster?

UK

[deropke]

Originally Posted by jwalker87

How many miles are on the belt and pulleys?

I don't know when or if belts and pulleys were ever changed, the car has 120k miles right now

[JonOhh]

If those components have not been changed at that mileage, it needs to be done as soon as possible. The accessory belt coming off on a N54 or N52 (probably a few others too) is not a small deal. It can nuke the entire engine.

[jwalker87]

Agreed - the belt/tensioner/pulleys are likely overdue for replacement even if unrelated, so start there. You should also familiarize yourself with other recommended maintenance for higher mileage BMWs here: https://www.dslreports.com/r0/downlo...e%20v03.13.pdf

For the belt change, check out www.realoem.com for the applicable part numbers, www.newtis.info for the replacement procedure, and I recommend www.fcpeuro.com for the parts themselves.

[deropke]

posting this incase someone in the future find this relative, I talked with mechanic and he said it's most likely manifold gasket, which expands when its hot and creates this noise

[AoS810]

Originally Posted by deropke

posting this incase someone in the future find this relative, I talked with mechanic and he said it's most likely manifold gasket, which expands when its hot and creates this noise

I don't see how this can be the case.. the intake manifold gaskets expanding wouldn't cause this rhythmic ticking sound from your video.

[deropke]

Originally Posted by AoS810

I don't see how this can be the case.. the intake manifold gaskets expanding wouldn't cause this rhythmic ticking sound from your video.

I have booking with different mechanic as well, we'll see what he says.