Rattle/flutter on low rpm boost/acceleration

[AnneTeak]

Hello

I wonder if you may be able to help... When accelerating from a low RPM (before boost?), between 1500-2000 RPM the car makes a rattle/flutter noise, almost metallic in sound.

The noise only occurs under moderate/heavy acceleration (i.e. not just very lightly accelerating up) and is most noticeable when in a high gear and low RPM.

Is it turbo related, belts perhaps? There is no noise on idle (or when accelerating when idle).

The car is a Volvo V60 D5.

Thanks

[AnneTeak]

Thanks for the replies guys, if detonation sounds like this I doesn't sound the same. It's more like a squeak noise and like something spinning at speed, similar to this noise in pitch, although I'm not sure its the belt.

Edited by AnneTeak on Tuesday 28th March 14:49

[AnneTeak]

Thanks, is there anyway to test the wastegate? Assuming the wastegate should be silent under load/acceleration?

The noise starts 1400 to 2200 RPM ish and sounds a little like a fan belt slipping. I would say marginally worse when cold, but that might be an illusion.

[AnneTeak]

Thanks guys. I've uploaded a video here, it's hard to hear but is from 4 second onwards. Sounds almost like a belt noise you sometimes here on cars, but only lasts around 1500-2200rpm.

Edited by AnneTeak on Tuesday 28th March 21:44