Sounds like an air raid siren!

My MGF has started making a very strange sound. I'm hoping someone on here recognises it! Its intermittent, but when its there its very loud. It does change pitch with RPM, but not in a direct correlation (if that makes sense?)Being in gear or out of gear makes no difference, nor does having the clutch engaged or disengaged. Speed makes no difference. Any ideas what it could be? Its louder on the passenger side. I was thinking possibly the fuel pump?

https://youtube.com/shorts/z1G6zlAwIWE?feature=share

Auxiliary belt slipping or in contact with something. Cambelt in contact with something. Cambelt tensioner bearing shot. Just suggestions. Is it a VVC?

neilpinleeds wrote:

Auxiliary belt slipping or in contact with something. Cambelt in contact with something. Cambelt tensioner bearing shot. Just suggestions. Is it a VVC?

Non VVC engine.

Cambelt and auxiliary belts were changed in August

Alternator belt slipping?

Sounds more like a bearing than a belt.
Complete guess, but alternator bearing? Belt on too tight?
Try putting different loads on the alternator e.g. headlamps on. Does the sound change with load?

Try loosening or taking the alternator belt off.

Is it possibly your passenger screaming in fear!

Are you sure it is more on the passenger than the driver's side as my first thought is the cambelt cover rubbing against the pulleys. The plastic cover is far from rigid hence some have retro fitted an extra bracket or sometimes a spacer to keep it away from the cam pullleys

I would go with a over tensioned aux belt resulting in bearing failure.