High pitch whistle

[james1_10018]

Hey Guys
I have had that problem once. Its the PCV valve.

[UNEVEN THOUGHTS]

Now that you mention that I do have a little diesel sound comming from the engine too. I guess it's about time to check and clean the PCV and ERG valves.

[Lashsquat]

Could be the oil filter believe it or not,my was making a high pitch sound,could hear while in park very well i assume going down the road as well..change the filter and it was gone!!

[transio]

It's your air intake. My morgantec intake whistles at specific speed / rpm /throttle combinations

[cascabel3]

Make sure the nut which attaches the pipe to the bottom of your EGR is tight. Takes a 22mm open end to tighten, a little ackward. This one if loose, will produce a diesel sound. Many posts on that subject by fellow VXers.