Hi guys,

Any idea on the above? It sounds like a slipping belt but I've replaced the supercharger belt and it's still making the noise. All the pulleys were free moving when the belt was off. I'm guessing it's not the serpentine belt as it's only doing it when the supercharger is on boost rather than all the time.

I've managed to occasionally replicate the noise when the car when stationary and it definitely sounds like it's coming from the rear of the car rather than the front, I'd say from the exhaust.

I guess it could be an exhaust leak, but I've never heard this kind of noise made from a leak, has anyone else?

 

Some threads for the other Jaguar models have pointed to a transmission squeal that sounds like a slipping supercharger belt. I have had it happen on occasion as well.

 

Thanks for the reply - I did consider the transmission and had a look round but it appears that the transmission chirp/squeal generally happens on upshifts, and this is much more like a slipping supercharger belt (i.e. does it as it accelerates up the gears rather than during changes).

I did notice that the lower pulley (i.e. the one that sits between the supercharger pulley and the crank pulley on my 5.0 v8 SC) had a small amount of play in it, maybe 1-2mm though I didn't notice this until I wiggled it in the right way. Not sure if this would cause it? I've also read that loose/broken baffles in the exhaust can cause the same thing. Think I need to get under the car and find out exactly where the noise is coming from.

 

This sounds like a pulley issue to me