andrew29620

It's more than just the filter I replaced. I replaced the entire air intake system almost a year ago and just have noticed the sound

JCooper

Oh. Ok. Did you notice the sound soon after servicing the filter? Or cleaning the MAF?

andrew29620

I cleaned the filter and maf sensor at the same time. I think it's just a look clamp making it whistle, I hope. This may be a dumb question becuase I don't know too much about being a mechanic. But could it be a vacuum leak?

JCooper

Not really sure. I was assuming it was a loose clamp or something too... especially after you said you had things apart to clean it. Good luck hunting down the noise.

andrew29620

Appreciate it

fordguy78

I test drove a truck at a dealer once that had the same k&n intake as you and it had a whistle like yours does and and it was just simply the aftermarket intake that did it. I have heard that they some times just have a whistle to them. I do agree though that it was VERY annoying!

andrew29620

It does have a whistle from the air intake which I love. But this is somthin else. It's more of a groan/whistle. It's not the normal air intake whistle.

60DRB

Two common maladies. One is the bearing in the alternator, during cold temperatures (20s F and below). My truck does this until the engine compartment warms up. The description you gave sounds exactly like that. Another that I just heard about recently is the power steering pump. I'm not sure if that is temperature related or not.

BIGDAWG78

if you have a CAI thats the culprit. Mine whistles too.

andrew29620

I think it's the bearing in the alternator. We have have unusually cold weather in South Carolina recently so It may be cold related.