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Thread: What could this noise be?

  1. #1
    Comp Engineering Student Riot_Polizei's Avatar

    2002 Mazda Protege5

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    What could this noise be?

    Hey guys, my car developed an incredibly irritating high-pitched frequency at closed throttle:

    https://youtu.be/kiksO7-o4jE

    Granted, acoustics are hard to make out in an engine bay, but it sounds like it could be coming from the throttle body(?) or somewhere around it. It doesn't sound like a typical exhaust leak, but could it be? It does go away under load, after all.

    I've also been told that it almost sounds "electrical", and that it could be a belt, one of the pulley mechanisms, or even the alternator, as the belts spin faster under engine load.

    It's got me scratching my head, that's for sure. Any ideas?
    2002 Mazda Protege5
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    ■ Megan Racing Rear Strut Tower Bar ■ Racing Beat Rear Sway Bar ■ Mazda6 Front Big Brakes ■ Foglight Deletes
    ■ OBX 4-1 Headers ■ MP3 ECU ■ VTCS-less Intake Manifold ■ Mishimoto Aluminum Racing Radiator + Fan Shroud
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  2. #2
    Comp Engineering Student Riot_Polizei's Avatar

    2002 Mazda Protege5

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    Anyone? I'm out here again, and I can clude that it's at least independent of the brake booster line, interior electronic accessories such as AC or lights.

    **NEW**
    It did NOT appear until car was warm up to temp. Drove around without the noise for maybe 2 minutes.

    It just sounds like it's coming from the IM and throttle body area.

    I got under the car, and that didn't help any. It's loud from far away, and it's loud up close.
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  3. #3
    Registered Member Corphish's Avatar

    83 RX-7 Gsl, 2000 Mazda Protege LX, 2011 Mazda3 Sport i

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    Maybe a cracked intake manifold? Mine does that cause my gasket has a small break in on part but mine also only come on at like 4-5k rpm

  4. #4
    Registered Member NaturalFlavored's Avatar

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    Well it's hard to tell or give advice. If it were me I would just take the day to just take it all apart see if anything is cracked or broken (get the gasket first of course). It might be something loose that may re-seal itself under pressure or something due to that nature. I'm just spit ballin here.

  5. #5
    Comp Engineering Student Riot_Polizei's Avatar

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    Quote Originally Posted by Corphish View Post
    Maybe a cracked intake manifold? Mine does that cause my gasket has a small break in on part but mine also only come on at like 4-5k rpm
    Haven't seen you in a while! Man I've done so much to my P5 since lol.

    Do you mean intake manifold gasket or manifold itself? I only recently installed this IM + MP3 ECU combo, and have destroyed one manifold gasket by neglecting to torque the bolts down properly. A new one was put in with proper torque specs, and that middle plenum gasket was still fine. Could the throttle body gasket also whistle?
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  6. #6
    Comp Engineering Student Riot_Polizei's Avatar

    2002 Mazda Protege5

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    Solved!

    A bolt, yet again, wasn't torqued properly on the IM, and the throttle body's bolts were not torqued.

    The whine is gone, and now my LTFT and STFT measurements have returned to normal. I'm rejoicing!
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  7. #7
    The Diagram Dude pcb's Avatar

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    You could probably ignore/postpone the fuel filter now.

    Somebody was obviously in there so there's a good chance it's all new components inside.
    The Diagram Dude

  8. #8
    The Diagram Dude pcb's Avatar

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    Are there things you can monitor to see if the fuel system is operating properly ?
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  9. #9
    Comp Engineering Student Riot_Polizei's Avatar

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    Quote Originally Posted by pcb View Post
    Are there things you can monitor to see if the fuel system is operating properly ?
    Yessir, using Torque Pro, I set up two meters for LTFT and STFT. Really handy to investigate P0171!
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  10. #10
    The Diagram Dude pcb's Avatar

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    Here's a list of the codes you could pop where "clogged fuel filter" or "fuel pump malfunction" are listed as a possible cause.

    P0131, P0132, P0133, P0171, P0300
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  11. #11
    Comp Engineering Student Riot_Polizei's Avatar

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    I'll write those down. Thanks man
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  12. #12
    The Diagram Dude pcb's Avatar

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    Your welcome.

    It's getting me to learn how to work my phone and search a PDF file.
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  13. #13
    Registered Member NaturalFlavored's Avatar

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    Whoooo natural for the win. Glad you got it figured out.
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  14. #14
    The Diagram Dude pcb's Avatar

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    I found this one too.

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