Are you sure you don't have an intake leak or something? Airbox lid not sealing properly or a loose clamp?
What the hell is this noise?!
Thread Starter
Drifting
Joined: Jan 2005
Posts: 1,342
Likes: 3
From: Arlington TX
What the hell is this noise?!
I'm getting frustrated... it's rather annoying and I'm stumped. Whenever I accelerate, or decelerate I hear air escaping/ "ssst" sound.. which starts loud and slowly bleeds off. Now, normally I would presume it is a vacuum leak of some sort... however it is tied in to the transmission it would seem. The reason I'm having such trouble diagnosing the sound is because with the clutch pushed in, and I downshift.. the sound appears while the clutch is disengaged... and the air noise appears while I push the car in to gear... that just doesn't make sense. The only thing I can imagine is the sound must be a clogged breather on my transmission.. I did paint the unit when I build it, but I'm certain I removed the tape from the breather. Anyone have some input?
Thread Starter
Drifting
Joined: Jan 2005
Posts: 1,342
Likes: 3
From: Arlington TX
I have a vararam, and I'm pretty sure it's sealed... but this shouldn't be anything on the engine... because the sound corresponds to the transmission rpm, not the engine rpm since the sound appears when the clutch is pushed in and downshifting... the rpm of the engine is at falloff/idle while you push into a lower gear.
Thread Starter
Drifting
Joined: Jan 2005
Posts: 1,342
Likes: 3
From: Arlington TX
that is probably a vacuum leak/brake booster diaphragm leak. I think we most likely have different issues. The noise is most likely coming from your firewall where the booster is located... high pitched noises have tendencies to reflect off surfaces and give false perception as to where they are coming from.. when the car is running stick your head by the pedals and hit the brake.
Last edited by 5.0_CJ; Apr 25, 2007 at 11:15 AM.
Racer
Joined: Feb 2005
Posts: 482
Likes: 1
From: Waveland MS
that is probably a vacuum leak/brake booster diaphragm leak. I think we most likely have different issues. The noise is most likely coming from your firewall where the booster is located... high pitched noises have tendencies to reflect off surfaces and give false perception as to where they are coming from.. when the car is running stick your head by the pedals and hit the brake.
This was my original post to somone else's thread on it.
http://forums.corvetteforum.com/show....php?t=1085929
I guess I'm no help, but I just wanted to let you know you're not alone.
Thread Starter
Drifting
Joined: Jan 2005
Posts: 1,342
Likes: 3
From: Arlington TX
You are describing the exact issue I used to have on my 98 M6. If I recall it would be this weird sound that would only occur in a situation as you've described. I actually lived with it for so long that I really forgot about it. This thread brings back the memory. Since then, I have added LT headers, a procharger, and Borla stingers. Needless to say, I don't notice the noise anymore. I'll bet a bunch of others have the same noise and don't realize it. It seemed to be as memorable as that ever-so-common belt chirp. BTW, that went away with the pulley reroute of the SC kit.
This was my original post to somone else's thread on it.
http://forums.corvetteforum.com/show....php?t=1085929
I guess I'm no help, but I just wanted to let you know you're not alone.
This was my original post to somone else's thread on it.
http://forums.corvetteforum.com/show....php?t=1085929
I guess I'm no help, but I just wanted to let you know you're not alone.
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Racer
Joined: Jul 2004
Posts: 444
Likes: 0
From: Dallas TX
Is it just when you are accelerating or decelerating?
Try going about 30 mph and push the clutch in and see if you hear it. Then put the transmission in neutral and let off the clutch. Does it go away or change?
Try going about 30 mph and push the clutch in and see if you hear it. Then put the transmission in neutral and let off the clutch. Does it go away or change?
Thread Starter
Drifting
Joined: Jan 2005
Posts: 1,342
Likes: 3
From: Arlington TX
I have not tried this yet, but I will this evening. I'm sure it probably will do it, but I will let you know. Any idea what could cause this?
Thread Starter
Drifting
Joined: Jan 2005
Posts: 1,342
Likes: 3
From: Arlington TX