Hissing sound from engine bay.
Results 1 to 13 of 13

This is a discussion on Hissing sound from engine bay. within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; I have a 2005 SAAB 9-2X Turbo. (a Subaru WRX ). with 16K miles only. At low speed acceleration, like ...

  1. #1
    Registered User saabaru_2005's Avatar
    Join Date
    Feb 2008
    Location
    Greenville, North Carolina
    Posts
    13

    Hissing sound from engine bay.

    I have a 2005 SAAB 9-2X Turbo. (a Subaru WRX ). with 16K miles only.
    At low speed acceleration, like pulling out from a parking lot, (accelerating from Zero to 20 MPH) -- there is a hissing sound coming from the engine compartment. Is that normal? How can I tell if the turbo pipes are leaking air?
    The car is well-maintained, very clean, never abused, No accidents.

    I live in Greenville, NC.
    The SAAB dealer is far, 100 miles away in Raleigh.
    Are there other Subaru WRX owners in Greenville, NC?

  2. Remove Advertisements
    ClubWRX.net
    Advertisements
     

  3. #2
    Registered User
    Join Date
    Nov 2007
    Location
    Chicago, IL
    Posts
    94
    This helped us find a turbo leak on my friends old car.

    Go get a spray bottle (like an old windex bottle). Mix a little dish detergent and water in it. Now, go turn your car on, and liberally spray any joints on the intake. You'll see bubbles forming if you got a leak. Its a little time consuming, but about the easiest way to do it.
    2007 OBP WRX TR
    Modless till summer

  4. #3
    Geriatric Ginger Mod Rogan's Avatar
    Join Date
    May 2007
    Location
    behind the wheel
    Posts
    8,188
    I Support ClubWRX
    Quote Originally Posted by saabaru_2005 View Post
    I have a 2005 SAAB 9-2X Turbo. (a Subaru WRX ). with 16K miles only.
    At low speed acceleration, like pulling out from a parking lot, (accelerating from Zero to 20 MPH) -- there is a hissing sound coming from the engine compartment. Is that normal? How can I tell if the turbo pipes are leaking air?
    The car is well-maintained, very clean, never abused, No accidents.

    I live in Greenville, NC.
    The SAAB dealer is far, 100 miles away in Raleigh.
    Are there other Subaru WRX owners in Greenville, NC?
    If the turbo pipes were leaking air, the car would run like crap; nature of a MAF sensored car.

    is it a constant-toned hiss, or does it rise in frequency as the car accels?
    Rogan o_0
    '96 Dodge 2500 CTD @ 40psi - over 700 lb/ft TQ, 7" stack, and 5speed! - SOLD
    '01 Dodge 2500 CTD 6-holed hand-shaker - 3850# dual disk - 900 lb/ft - SOLD
    '97 Dodge 3500 CTD DUALLY built Auto - 40psi boosties - 750 lb/ft

  5. #4
    Administrator TheJ's Avatar
    Join Date
    Jul 2002
    Location
    Bro do you even live in the Dirty South
    Posts
    17,923
    I Support ClubWRX
    I would check and make sure the air filter box was closed/seated properly.
    -The J
    New Members, CLICK & BOOKMARK these links:


    "Driving most supercars is like trying to manhandle a cow up a back staircase. . . This is like smearing honey into Keira Knightly" -JC

  6. #5
    Geriatric Ginger Mod Rogan's Avatar
    Join Date
    May 2007
    Location
    behind the wheel
    Posts
    8,188
    I Support ClubWRX
    Quote Originally Posted by TheJ View Post
    I would check and make sure the air filter box was closed/seated properly.
    +1

    How long have you had the car? Has it done this, the whole time, that you are aware of? first turbo car for you?
    Rogan o_0
    '96 Dodge 2500 CTD @ 40psi - over 700 lb/ft TQ, 7" stack, and 5speed! - SOLD
    '01 Dodge 2500 CTD 6-holed hand-shaker - 3850# dual disk - 900 lb/ft - SOLD
    '97 Dodge 3500 CTD DUALLY built Auto - 40psi boosties - 750 lb/ft

  7. #6
    Would Never, Ever Say Something Bad About an Admin's Mom SonicWagon's Avatar
    Join Date
    Jul 2007
    Location
    Santa Cruz New Mexico
    Posts
    5,742
    Could it be the turbo spooling?
    "It is at our most challenging times that we must cheat our very hardest" - Eric Theodore Cartman
    Quote Originally Posted by Weasel 555 View Post
    so whose up for been banned?
    Quote Originally Posted by RayfieldsWRX View Post
    I is teh b1ggest douche evarrrr!~

  8. #7
    Registered User saabaru_2005's Avatar
    Join Date
    Feb 2008
    Location
    Greenville, North Carolina
    Posts
    13

    Hissing sound from engine bay.

    The hissing sound is a constant tone hiss. No change in frequency with accels. When the engine speed (not car speed) reached a certain RPM, the Hissing kicks in, constant frequency hiss. When the engine speed drops to a certain RPM -- such as shifting to the next higher gear, the hissing stops. It starts again, when I rev the engine, before the next higher gear. In other words: no hissing between gear changes, when I cut back the throttle.

    I just bought this car. with 16 K miles. in perfect (visual) condition.

    I own another turbo car for 6 years. I know how a turbo whine sounds like. A turbo whine will go up in frequency with RPM. The Hissing sound does NOT go up in pitch (tone/frequency). The pitch stays the same. It sounds like a compressor leaking air.
    Last edited by saabaru_2005; 02-23-2008 at 08:16 AM.

  9. #8
    Geriatric Ginger Mod Rogan's Avatar
    Join Date
    May 2007
    Location
    behind the wheel
    Posts
    8,188
    I Support ClubWRX
    light/part-throttle cruise, does it hiss?
    Rogan o_0
    '96 Dodge 2500 CTD @ 40psi - over 700 lb/ft TQ, 7" stack, and 5speed! - SOLD
    '01 Dodge 2500 CTD 6-holed hand-shaker - 3850# dual disk - 900 lb/ft - SOLD
    '97 Dodge 3500 CTD DUALLY built Auto - 40psi boosties - 750 lb/ft

  10. #9
    Registered User saabaru_2005's Avatar
    Join Date
    Feb 2008
    Location
    Greenville, North Carolina
    Posts
    13
    No hissing at cruising speed.
    No hissing at light throttle.
    No hissing at part-throttle.

    Question for "KREX": regarding the spray bottle method -- do I have to rev the engine while spraying?
    What is the air pressure inside the turbo pipes at idling RPM?
    Last edited by saabaru_2005; 02-23-2008 at 08:24 AM.

  11. #10
    Geriatric Ginger Mod Rogan's Avatar
    Join Date
    May 2007
    Location
    behind the wheel
    Posts
    8,188
    I Support ClubWRX
    sounds like a pressure test is in order.
    Rogan o_0
    '96 Dodge 2500 CTD @ 40psi - over 700 lb/ft TQ, 7" stack, and 5speed! - SOLD
    '01 Dodge 2500 CTD 6-holed hand-shaker - 3850# dual disk - 900 lb/ft - SOLD
    '97 Dodge 3500 CTD DUALLY built Auto - 40psi boosties - 750 lb/ft

  12. #11
    Geriatric Ginger Mod Rogan's Avatar
    Join Date
    May 2007
    Location
    behind the wheel
    Posts
    8,188
    I Support ClubWRX
    Quote Originally Posted by saabaru_2005 View Post
    Question for "KREX": regarding the spray bottle method -- do I have to rev the engine while spraying?
    What is the air pressure inside the turbo pipes at idling RPM?
    idle rpm, vacuum is present.
    no positive pressure.
    Rogan o_0
    '96 Dodge 2500 CTD @ 40psi - over 700 lb/ft TQ, 7" stack, and 5speed! - SOLD
    '01 Dodge 2500 CTD 6-holed hand-shaker - 3850# dual disk - 900 lb/ft - SOLD
    '97 Dodge 3500 CTD DUALLY built Auto - 40psi boosties - 750 lb/ft

  13. #12
    Registered User
    Join Date
    Mar 2007
    Location
    STL
    Posts
    20
    I have a 2002 WRX. When the car is cold I hear a rush of air under hard acceleration. It sound like a leak form the turbo! However after the car warms up it goes away. My car has always done this since I bought it used with 29k on the clock. I have have had no issues to date. Could it be something that seals up after its warm? who knows!

  14. #13
    Registered User saabaru_2005's Avatar
    Join Date
    Feb 2008
    Location
    Greenville, North Carolina
    Posts
    13
    That sounds familiar to what is happening with my car.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •