When either in nuetral or in drive when i give it gas it makes a hissing noise..like a air leak. Im thinking it might be an injector but there is no gas smell. Anybody else had this problem? I have an 03 tl-s

 

is it loud or just subtle. Do you hear it with heavy throttle or just light

Or is this the same whining noise you hear that you think is from the tranny

 

It is a different noise than the one from the tranny. It does it the whole rpm range and if i were to "rev it up" in nuetral it does it going up and down the rpms. Might be an injector o-ring

 

Doubtfull. Try listening under the hood while reving or ideling to see if you can start to locate the area.

 

I agree. Also try listening for it under the car to make sure its not an exaust leak.

 

Its the same noise as when you turn the car off. If anyone has this problem...normalty...you will know what im talking about. Ive got the new exhaust system on the way so if it is cat-back the leak will be fixed. If between cat and manifold ill get it looked at.

 

No i know the sound that hes talkin about...; I postd something about this before.... When u rev 2 a lil under 5K RPM it hisses enuff to sound like a turbo spoolin up,.. I dunn0 thats what it sounds like to me...

 

yea sounds like a air leak or pressure release from somewhere....

 

bad connection/hose at the Throttle body?

 

This sounds like what I have but ONLY when the AC is turned on. Goes away when off: Whirring from the engine that gets worse as engine speed increases. Did you ever get the results from your problem?

 

My car does the same thing...I just assumed it was the aftermarket intake. It does sound like s turbo spooling up though.

 

Have you modified the intake system at all? CAI, different filter, etc?

 

my headers hiss. ever since i put on the ss autochrome ones like 3 years ago... (still holding on strong by the way)

 

OK dunno if you're still having this problems but heres a possibility.

I took out my IM a few months back to clean the EGR valve. Normal right? I hooked everything back up correctly, double checked, all safe and sound. The past two months I've heard the SAME sound, especially in the higher RPM's. Ignored it figuring it was due to me missing 1 of the bolts on the Plenum cover. Turns out, while I was detailing my engine yesterday, 1 of the hoses connected to the black piping that's connected to the TB had somehow slipped off. Its was the tube that just slips onto a smaller metal tube thats built into the intake piping. This small tube im talking about connects to the engine right below the TB. See if its the same problem for you.

Sorry if that was confusing, but I tried to make sense. If not I'll post up a picture tomorrow.

 

hissing noise is indicative of a vacuum leak. Try to follw where the noise is coming from..

 

might be something stupid like a loose or disconnected hose on the firewall side of your IM. check under the hood for the sound while pushing the throttle plate down.