Hissing sound from under dash
Thread Starter
Member
Joined: 05-17-2007
Posts: 32
From: Orlando, Fl
Hissing sound from under dash
I have an 2007 HHR with 93 K on it, and I noticed to day there is a hissing sound, (or air escaping sound coming in from under the dash.) the sound isn't my a/c, shut it off, sound is still there. But the sound goes away when I press on the brakes, making me think it's something with my brakes. I turned the car off and the sound slowly dissapaited.
Any ideas would be helpful, and please no snake jokes..
****I just noticed that the boot that goes from the back of the brake pedal to the firewall appear to have some leakage at the bottom of the boot.****
Any ideas would be helpful, and please no snake jokes..
****I just noticed that the boot that goes from the back of the brake pedal to the firewall appear to have some leakage at the bottom of the boot.****
Last edited by Gol10dr; Oct 4, 2011 at 06:43 PM. Reason: added info
Thread Starter
Member
Joined: 05-17-2007
Posts: 32
From: Orlando, Fl
Maybe, the funny thing is... The "hissing" sound has went away, but it threw a engine code of P0171.. So now I'm really stumped... Because if my memory serves me correct, the is an O2 sensor code..
Deceased
Joined: 06-30-2010
Posts: 25,739
From: Kannapolis NC
Sounds like you have a broken or leaking flex pipe, they'll throw a P0171 if the oxygen sensors are reading lean due to an exhaust leak. Give this thread a read....
https://www.chevyhhr.net/forums/problems-service-repairs-42/catalytic-converter-p0171-27304/
https://www.chevyhhr.net/forums/problems-service-repairs-42/catalytic-converter-p0171-27304/
Platinum Member
Joined: 12-06-2009
Posts: 11,719
From: Alabama
Could be dealing with 2 seperate issues. I refer to the OP's original post.
" I turned the car off and the sound slowly dissapaited" This quote sounds like a brake booster/vacuum leak not a flex pipe issue. The CEL that popped up seems to be from something else. Just my 2 cents, based on the original post.
" I turned the car off and the sound slowly dissapaited" This quote sounds like a brake booster/vacuum leak not a flex pipe issue. The CEL that popped up seems to be from something else. Just my 2 cents, based on the original post.
Member
Joined: 01-28-2010
Posts: 37
From: Canton Ga.
Whistle noise
I was thinking i was the only one who thought i had a brake booster leaking. The other day i noticed my brake pedal felt soft. Was going down farther
than it used to. Then i heard a whistling noise when i let off the brake. Took it to a GM dealer to make sure. Said all was fine. I know a soft pedal when i feel one. I work in a new car dealer parts dept. Not Gm. Tech thinks its leaking booster also. Anyone else had to replace a booster?
than it used to. Then i heard a whistling noise when i let off the brake. Took it to a GM dealer to make sure. Said all was fine. I know a soft pedal when i feel one. I work in a new car dealer parts dept. Not Gm. Tech thinks its leaking booster also. Anyone else had to replace a booster?
Platinum Member
Joined: 01-09-2007
Posts: 16,081
From: SE USA
