[besnik]

I've recently started hearing this noise in my M235i, at about 3500-4000rpm itll make this sort of metallic grinding noise, it happens almost every time when I'm in manual mode and the car is fully warmed up. My car is also at 82k miles if that means anything.

I'm almost positive it's the VANOS but I wanna do some online research before I take it anywhere.

Does anyone have any ideas?

Here is a video I took:

It happens twice in the video, you have to listen closely

[MarcoZandrini]

Does it make the same noise when the engine is rev'd while the transmission is in park? Have you scanned the engine computer (DME) for codes?

[besnik]

Originally Posted by MarcoZandrini

Does it make the same noise when the engine is rev'd while the transmission is in park? Have you scanned the engine computer (DME) for codes?

ive only tried revving it in park once and I havent heard it, I will try again today though, and yeah I scanned yesterday didnt get anything, will scan today again to make sure

[delvec03]

tbh it sounds more like a resonance vibration than grinding. that's also probably due to the video and not hearing it in person. If the house doesn't recreate when parked it might be speed related?

[besnik]

Originally Posted by delvec03

tbh it sounds more like a resonance vibration than grinding. that's also probably due to the video and not hearing it in person. If the house doesn't recreate when parked it might be speed related?

yeah probably, and idk i dont think so, i think its just because its under more load when youre actually driving, you got any ideas?

[XutvJet]

Sounds like an exhaust or heat shield rattle. Do you have the M Performance exhaust by chance?

[besnik]

Originally Posted by XutvJet

Sounds like an exhaust or heat shield rattle. Do you have the M Performance exhaust by chance?

I do not, I do have catless downpipes and a vrsf charge pipe though

[delvec03]

Originally Posted by besnik

yeah probably, and idk i dont think so, i think its just because its under more load when youre actually driving, you got any ideas?

if it only happens in manual mode, that might help trace down the issue. I don't have an auto, hut there are two modes, right? manual and manual sport? does it happen in both, does vanos change in manual vs auto? also not sure vanos issues cause a metallic sound.

[besnik]

Originally Posted by delvec03

if it only happens in manual mode, that might help trace down the issue. I don't have an auto, hut there are two modes, right? manual and manual sport? does it happen in both, does vanos change in manual vs auto? also not sure vanos issues cause a metallic sound.

well you see, it happens in manual because in automatic the rpms dont go that high, and when they do go that high that means Im pushing the car and the exhaust outweighs te grinding noise.

You get what I mean?

So if it pop it into manual or manual sport and just slowly accelerate and let the rpm's ride to about 3500, that weird metallic grinding noise ocurs

[DBinOC]

I would agree with Xutvjet - it sounds more like a heat shield of some sort is rattling at a specific frequency / RPM.

DBinOC

[Ericwj7]

I believe it would be a rattle related to a loose exhaust piece/shield (as others have said) as no codes we're shown. I'm at 50k on mine & already had a slightly scary loud exhaust rattle @ a cold start up but it's just that pin that get's worn from opening up the 2nd exhaust pipe. Cheers & hope it's not a Vanos component!