High Pitched whistling noise and fluctuating oil pressure

[Mastodon]

I noticed about a week ago that my 2000 XJ was making a high pitched whistling noise in the mornings on my way to school, and at night from my way back from work.

I only notice it when it's cold outside and at first it seemed to be related to whether or not I was running the heat.

Tonight I noticed that the oil pressure would fluctuate between one notch under 40 when I let it coast, to 1 notch above 40 when I was accelerating.

Whenever I let it coast and it went under the whistling would get louder, but whenever it got above 40 the whistling would disappear.

So I was wondering what the cause of this could be and if I should get it taken care of as soon as possible.

Thanks a bunch.

 

[Mtb Jak]

alternator? batt gets cold and looses charge and then the alt has to work hard to charge it back up?


thats what my whistling noise was.

 

[lawsoncl]

The oil pressure will normally change with rpm. The dash guage isn't terribly accurate anyway. Could be a noisey belt or a idler/alternator/ps bearing starting to go.

 

[Blaine B.]

3rd repost?

 

[Mastodon]

Sorry about the repost. My browser locked up and it must have done multiple posts when I hit refresh.

 

[Blaine B.]

Oh ok, sorry.