Thread: Whistle in engine bay over 3,000rpm

Just changed my LIM gaskets over the weekend and today was the first day I really got on it. I noticed if starting from a stop, during a pretty heavy accel, in 1st gear i get a whistling in the engine bay, and gets a little louder when I keep going past 3k. When I let off it sounds like a blow off valve, but not as noticeable.

I only notice this sound with my windows down. I have no high/rough idle, and no CEL's. Does not make the whistle under 3k in any gear, only over 3k.

Is this something ive never noticed before? I rarely get on it, and I rarely have my radio down, so maybe its been happening prior to my LIM change?

Any insight?

Eureka...you a vacuum in there with a WOT switch?

Honestly...it does sound like a vacuum leak...and they won't always throw a code. Spray some carb cleaner around the engine bay to see

just a shot, but my CAI sounded like this and so does my gutted airbox with a K&N

How did the throttle body look? Mine was really dirty!!!! and I hit it with some cleaner and now its super quite. My only intentions were to fix the sticking throttle blade... which I did, but I also notice that when I turn my car off, it doesn't do that "one last breath, before sleep" thing anymore.
But I also used 3 cans of parts cleaner and 4 rolls of paper towel and about 150 q-tips to clean everything I put back on that wasn't getting replaced.

edit.... if u used a dorman intake... Just remembered that my new PCV holder wasn't holding it tight enough to the plenium, so I just used the original one, problem fixed!

I reused my UIM, because it was replaced in 2003 under warranty with the original owner. It looked great, so I just changed the gasket. I cleaned the TB last year and it was caked, but looked like new still last weekend.

In a rush to finish by the time it got dark last sunday, the last thing I installed was the rubber air intake tubing from the TB to the stock airbox. I popped it on the TB, but forgot to hook up and worm clamp the hose back onto the airbox side.

That explains my low mpg's, and that goes to show not to rush the work. At least it wasnt something major I forgot to do. Connected the hose to the airbox side and no more whistle.

Thanks for the help guys.

Good to hear that you got it figured out. You still got the stock airbox in there.....

Originally Posted by Pepino

You still got the stock airbox in there.....

Meh...Im not wasting money on a N/A GT...

Ill enjoy my 23 mpg city and look good while doing it. I have nobody to race, and even if I did, I wouldnt win.