Strange Ticking/tapping Noise

[james250]

Now that cold mornings are here, i got out of my IS250 to get something from the boot while it was warming up and the noise from outside the car sounds a bit strange. Not as smooth sounding. It sounds a bit like the injection tappet noise but louder but the injection tappet noise i've always had and it can really only be heard if i open the hood and listen. But this noise is a louder version of the injection tappet noise but clearly can be heard from outside. At first i thought maybe waterpump or the belt, but waterpump bearings dont make that noise and the noise disappears after driving a little and once car is warmed up a little.

My oil change is due soon, i've topped up my oil recently and will be changing oil and filters in about 1k miles.

If it was the belt, would the noise disappear when warmed up like it does?

[Silver Arrow]

One of the GS250's I test drove was very loud too. I think it varies. God knows why! High Pressure injectors are very noisy, and to be honest I wouldn't worry too much if it is that.

[james250]

Found the following youtube video:

I popped open the hood this morning when hearing this noise, it does sound like serpentine belt. Once warmed up the noise disappears. Some people suggest spraying something like WD40 on the belt while its spinning to determine if it is the belt.

Is it the belt that needs replacing or tensioning? how easily does the belt come off? any tests that can be done?