I recently installed a new K&N cold air intake and for the first week or so, it sounded fantastic. At higher RPMs, my truck sounds beastly now. However, ever since, I've been noticing this annoying metallic whistling noise coming from the front end of my truck. It only seems to occur at lower RPMs. If I let off the gas pedal, the sound goes away. Alternatively, if I gun it, the sound goes away.
I've read other forum threads about similar issues but some people say it's supposed to be like that, or turn up your radio. Not really constructive advice on how to get rid of this annoyance...
So after doing a bit of research, I found it could either be:
- Throttle Body Spacer
- Air leak
- Idle Air Control Valve
- Rear Bearing issue in the Alternator
I don't have a Throttle Body Spacer installed so that's not it.
So far, I've checked all electrical connections and hoses that connect to the intake and everything looks as it should. I also verified the clamps are all tightened and there don't seem to be any visible inconsistencies or leaks. How would I go about diagnosing an air leak?
Here's the link for the intake I bought for reference:
Any ideas what could be causing this? The sound is very annoying and does not sound in any way to how a supercharger sounds so living with this problem is not an option for me.
Any help would be greatly appreciated.