So I installed my injen CAI today on my 06 bsp tC. Everything runs great, but theres a high-pitch squeal durring the middle rpm's of accelerating. I immediately thought "leak" but I went back and double checked and tripple checked everything, and everything is sealed and on correctly.
So then I thought it may be wind squeal on the windows, so I tried rolling them all up and then you couldn't hear the squeal. Then I tried rolling down just one and noticed the squeal only occured on a mid to heavy accell. So i tried putting the oposing window down and its the same story.

So any ideas on what part of the CAI could be causing? I never had this squeal before hand.

BTW theres no CEL, I did reset the ECU and let the car idle for 10 minutes after installing the CAI.

 

If it's what I'm thinking it is, your stock intake made the same high pitch noise, only not quite as loud. If I turn down the radio and open the windows I can here my stock intake breathing with a nice high pitch woosh. With aftermarket intakes the noise seems to increase. You're probably just noticing the same noise for the first time because it's now louder than before. If you're not throwing a CEL and there seems to be no problem with the way the car's running, then there's no need to worry - it's supposed to sound that way.

 

I have an Injen CAI and I get that high pitched sound when I go past a certain throttle position. I read somewhere here on SL that the "whistling" sound is normal, so I think it's nothing to worry about.

 

This must be your first CAI. The whistle is perfectly normal...IMO it's one of the perks of the CAI. I love that whistle (reminds me of my old turbo). Don't worry about it...it's all normal. Enjoi the Injen!

 

here you go homie. answered you on scikotics.com, but I guess I'll give the SL answer

https://www.scionlife.com/forums/vie...istle&&start=0

 

yeah i had a k and n.... and it would do that... but i got a CEL for other reasons so i went back to the stock box... then after a while it was there too. so its always been there... but the pitch and loudness are amplified with more air going through.

 

thanks everyone, yea this is my first CAI. My first car worth modding, just got rid of an 91 corolla that was a real piece.

 

I had a 91 Corolla too! I don't miss it at all.

 

EL OH EL. 91 corolla... o m g.

my friend drives one of those and you won't believe what he's doing to it. just picture it in ricer form..

but that car runs good. my dad had one.

 

it's normal. i have a fujita and the whistling got LOUD. haha. i love it though.