strange wistling noise

[Dev]

I can only describe it as a constant chirping noise (subtle) that appears >2000 rpm. It comes from behind the valve cover near the injector rail(not injector chatter). It sounds like a vaccum leak...but I cannot find one.

any advice appreciated thanks in advance
Dev

[TypeR 801]

Grasping at straws here....do you have a Comptech Foam Filter? If so, that may be the source. I have a turbo like whistle from my car at certain throttle positions because of the comptech filter.

I can only describe it as a constant chirping noise (subtle) that appears >2000 rpm. It comes from behind the valve cover near the injector rail(not injector chatter). It sounds like a vaccum leak...but I cannot find one.

any advice appreciated thanks in advance
Dev

[Dev]

No, bone stock..but thats a good way to describe it...its like a turbo whistle,,only subtle.

[Trey]

Throttle body on our cars is known to whistle even stock. It becomes more appearent with intake modifications. Is it based on throttle position or RPMs?

[Dev]

RPM, which concerns me, The whistle sound like it is coming from deeper than the throttle body.

I wouldnt be so crazy about it if I had heard it all along, seems like it had appeared w/in the last 500mi.

[Trey]

THat is interested. There us a common whistleing noise than will come and go at certain rpms but is typically present when accellerating and disaapears when decelerating.

Can't think of any thing else to whistle.

[Dev]

Im going to go out on a limb here and assume the worst.

I know we have loads and loads of intellegence on this board..Ive seen the pics from the Expo

So the whistle has a Hz property, It tends to run in cycles. It starts quiet, quiet >= to 1700 rpm and begins to cycle at about 2000 on (a bit louder) My concern is that there could be a bearing that is about to peace-out on me. Has anybody had a bearing commit suicide..maybe you can describe the sounds you heard prior.

One last question, I know honda (type-r in particular) is known for tappy valves, but could the whistling be due to high cycle pinging (made up that term)

Thanks
Dev

[Jan Niemi]

sounds like it's possibly coming from the pcv valve.

[Champ R]

My stock intake made a faint whistle sound like you are describing, and does the same, only louder with my current comptech icebox. It only really makes noise on low-mid throttle positions from between 2-4k rpm.

[Dave-ROR]

You'll know if it's a bearing. If you suspect a vac leak just get a can of carb cleaner and spray it around the area with the motor running, if smoke flys out the exhaust you've hit it.