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1999 355 engine whistling

Discussion in '348/355' started by speeder37, Aug 23, 2008.

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  1. speeder37

    speeder37 Karting

    Nov 18, 2003
    96
    Chicago
    Full Name:
    Matt
    #1 speeder37, Aug 23, 2008
    I've got one that I think has not come up before. The car has a relatively loud whistle sound when going through the gears and at constant speed. the sound subsides at idle.
    It is very annoying. I might think that it is a vacum hose off somewhere, however the car runs great. There is no bog or miss whatsoever.
    The car is stock with a Tubi.

    any ideas?
     
  2. gothspeed

    gothspeed F1 World Champ

    May 26, 2006
    10,244
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    goth
    #2 gothspeed, Aug 23, 2008
    Is it a whine as in gearnoise or a whistle as in air noise?? I have heard loose timing belts make a whine when cold on non-f-cars. Though I have yet to hear it in an f-car.
     
  3. 285ferrari

    285ferrari Two Time F1 World Champ
    Sponsor

    Sep 11, 2004
    20,952
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    Robbie
    #3 285ferrari, Aug 23, 2008
    Bypass valve will whistle sometimes also. Is all the time or up in the rpm range when the valve opens..
     
  4. speeder37

    speeder37 Karting

    Nov 18, 2003
    96
    Chicago
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    Matt
    #4 speeder37, Aug 23, 2008
    It is not a gear whine. It is a whiste sound. Sometimes it goes away for a couple of minutes. The bypass valve was replaced last year. I think that it is still ok.
    Any other thoughts?
     
  5. gothspeed

    gothspeed F1 World Champ

    May 26, 2006
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    goth
    #5 gothspeed, Aug 23, 2008
    Does the sound follow the engine RPM??
     
  6. jm348

    jm348 F1 Rookie
    Owner Silver Subscribed

    Mar 21, 2007
    3,017
    Redondo Beach, CA
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    Jeff M
    #6 jm348, Aug 24, 2008
    Does it do it only around pretty girls? :D


    Anyway, mine whistles on start up when it is cold....I believe to help warm up quicker but always goes off after 2 minutes :eek:
     
  7. gothspeed

    gothspeed F1 World Champ

    May 26, 2006
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    #7 gothspeed, Aug 24, 2008
    That is the startup air pump ........ but you already knew that ....... ;).
     
  8. fatbillybob

    fatbillybob Two Time F1 World Champ
    Consultant Owner

    Aug 10, 2002
    28,712
    socal
    #8 fatbillybob, Aug 24, 2008
    Sometimes you get that when cold exhaust pipes have not warmed up and sealed because the old exhaust donuts between some pipes are old and leaking. You can buy them at the local muffler shop for about 3 bucks each.
     
  9. speeder37

    speeder37 Karting

    Nov 18, 2003
    96
    Chicago
    Full Name:
    Matt
    #9 speeder37, Aug 25, 2008
    The whistle is similar to the startup air pump. It does not seem to rise and fall with with RPM's. It is more constant and goes away at idle. It is not present with a cold engine. It begins after a couple of miles.
    Is there any way to check the exhaust donut option? It makes sense except for not making the noise cold.
    Any additional thoughts?
    Thanks all
     
  10. UConn Husky

    UConn Husky F1 Rookie

    Nov 11, 2006
    4,424
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    Jay
    #10 UConn Husky, Aug 25, 2008
    On my STi my snow tires make some strange resonant noises at certain speeds...any chance it's tire related?
     
  11. ksim

    ksim Karting

    Feb 20, 2006
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    West London
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    Kwang
    #11 ksim, Aug 26, 2008
    Air hose leaking most probably, (front of engine)change it. Mine the same but no real harm
     
  12. ksim

    ksim Karting

    Feb 20, 2006
    93
    West London
    Full Name:
    Kwang
    #12 ksim, Aug 26, 2008
    Air hose leaking most probably, (front of engine)change it. Mine the same but no real harm
     
  13. speeder37

    speeder37 Karting

    Nov 18, 2003
    96
    Chicago
    Full Name:
    Matt
    #13 speeder37, Aug 28, 2008
    Air Hose? What exactly do you mean by air hose?

    It is definitely not tire related
     
  14. f355spider

    f355spider F1 World Champ
    Owner Rossa Subscribed

    May 29, 2001
    18,036
    USA
    #14 f355spider, Aug 29, 2008
    Speeder, also check that your idle control motor is properly seated in the Y pipe just after the mass air flow sensor. Mine had come loose and made a giant sucking/whistling sound...I immediately drove home (only a few blocks away) and corrected it (loose mounting bolt for idle control motor).
     
  15. Gershwin

    Gershwin F1 Veteran

    Feb 21, 2005
    6,415
    Kentucky
    #15 Gershwin, Aug 30, 2008
    It is nothing to worry about and is only the fuel injection. Happens on cold starts.


    Enjoy the car!
     

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