Engine makes Chirpy sound when taking foot off gas | FerrariChat
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Engine makes Chirpy sound when taking foot off gas

Discussion in '308/328' started by SeanPeterLynch, Jul 29, 2014.

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  1. SeanPeterLynch

    SeanPeterLynch Karting

    Jun 17, 2014
    187
    #1 SeanPeterLynch, Jul 29, 2014
    If I rev up and take foot off gas, its sounds almost as if there's a bird chirping.
     
  2. SeanPeterLynch

    SeanPeterLynch Karting

    Jun 17, 2014
    187
    #2 SeanPeterLynch, Jul 29, 2014
    Its almost like random intermittent chirps after a high rev. Dont hear it in idle, and not really in throttle as well, only rev down.
     
  3. Crowndog

    Crowndog F1 Veteran

    Jul 16, 2011
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    #3 Crowndog, Jul 29, 2014
  4. SeanPeterLynch

    SeanPeterLynch Karting

    Jun 17, 2014
    187
    #4 SeanPeterLynch, Jul 29, 2014
    yikes. No its almost like a tiny few chirps after acceleration. Bad mystery engine sound is quite bad. Mine isnt similar to this. I'm going to try and and post something shortly.
     
  5. SeanPeterLynch

    SeanPeterLynch Karting

    Jun 17, 2014
    187
    #5 SeanPeterLynch, Jul 29, 2014
    Feel like mine may be the exhaust. going to follow up tonight
     
  6. Crowndog

    Crowndog F1 Veteran

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    #6 Crowndog, Jul 29, 2014
    Stethoscope is your best friend in this case perhaps.
     
  7. SeanPeterLynch

    SeanPeterLynch Karting

    Jun 17, 2014
    187
    #7 SeanPeterLynch, Jul 29, 2014
    The chirping kind of matches with the burbles that the engine/exhaust makes when you come off a rev.
     
  8. pappy.72

    pappy.72 Formula Junior

    Nov 13, 2010
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    #8 pappy.72, Jul 29, 2014
    Intake whistle/chirp maybe?
     
  9. SeanPeterLynch

    SeanPeterLynch Karting

    Jun 17, 2014
    187
    #9 SeanPeterLynch, Jul 29, 2014
    There is definitely a whistle on the intake. Thats a distinct sound. This is more of a scattered random chiping on rev-down. Almost in the same random pattern as the bubbling burble of the engine on rev-down. I read somewhere on here that loose metal inside the exhaust (sign of age) can be the culprit.
     
  10. SeanPeterLynch

    SeanPeterLynch Karting

    Jun 17, 2014
    187
    #10 SeanPeterLynch, Jul 29, 2014
    Last edited by a moderator: Sep 7, 2017
    Here it is. I have 2 clips.

    One that highlights the expected induction whistle. The second highlights the chirp after a high rev. If you listen closely the chirp matches the exhaust burble (making me think its the exhaust being old). Seems like this is common with stock exhaust pipes that have aged from some of posts ive read.

    Open to thoughts

    83 QV
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  11. wildcat326

    wildcat326 Formula 3
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    #11 wildcat326, Jul 29, 2014
    Longshot guess from a relative novice, but perhaps a butterfly valve in a carb sticking open? Wouldn't sound unusual when its wide open, but might chirp air if trying unsuccessfully to fully close?
     
  12. wildcat326

    wildcat326 Formula 3
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    #12 wildcat326, Jul 29, 2014
    Does the car lurch or have any issues smoothly slowing when you take your foot off the pedal? Just thinking about sticking throttle pedal cable.
     
  13. wildcat326

    wildcat326 Formula 3
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    #13 wildcat326, Jul 29, 2014
    Disclaimer: I probably don't crack the top 50 technical experts on the 308 board, so don't take my advice until someone regarded here as an expert also weighs in.
     
  14. SeanPeterLynch

    SeanPeterLynch Karting

    Jun 17, 2014
    187
    #14 SeanPeterLynch, Jul 29, 2014
    Its injected so no carb. Occasionally carpet gets stuck under accelerator but causing chirp. Listen to my parked revs in second file.
     
  15. wildcat326

    wildcat326 Formula 3
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    #15 wildcat326, Jul 30, 2014
    A-ha!!! EXACTLY! Your injected car is missing carburetors.

    Case solved!

    (Precisely why I mentioned you should take my mechanics advice with a grain of salt).
     
  16. jessup

    jessup Formula Junior

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    #16 jessup, Jul 30, 2014
    Sounds like your exhaust is falling apart.
     
  17. greyboxer

    greyboxer F1 World Champ

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    #17 greyboxer, Jul 30, 2014
    Two common things to check are the exhaust heat shield which cracks and then (less likely) the cam belt covers which sometimes loosen altho this noise tends to be a little deeper
     
  18. Iain

    Iain F1 Rookie

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    #18 Iain, Jul 30, 2014
    Listening to the second MP3 file, I think the noise is happening as you increase the revs as well. Sounds like a bearing noise to me - maybe the alternator or water pump? That's where I'd look first.
     
  19. SeanPeterLynch

    SeanPeterLynch Karting

    Jun 17, 2014
    187
    #19 SeanPeterLynch, Jul 30, 2014
    Thats interesting. I feel like i hear it after the rev, when RPMs are on way down and engine is burbling/bubbling. Feel like the chirps fit in with that which makes me think its exhaust since burble is probably excess fuel burning off in exhaust.

    Obviously exhaust would be best outcome... but will keep bearings in mind..
     
  20. bentrm

    bentrm Formula Junior

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    #20 bentrm, Jul 30, 2014
    Exhaust leak. My 83 makes a chirp too. But it's from the alternator belt and only happens for 10 seconds on start up.
     
  21. MNExotics

    MNExotics F1 Rookie
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    #21 MNExotics, Jul 30, 2014
    I had that too on my belt but a quick shot of belt dressing cured that
     
  22. bentrm

    bentrm Formula Junior

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    #22 bentrm, Jul 30, 2014
    Gotta try some. Did belt service a month ago. Suspect I got some grease on it on the process.
     
  23. SeanPeterLynch

    SeanPeterLynch Karting

    Jun 17, 2014
    187
    #23 SeanPeterLynch, Jul 30, 2014
    So folks think its hole in exhaust..
     
  24. Bell Bloke

    Bell Bloke Formula 3

    Dec 6, 2012
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    #24 Bell Bloke, Jul 31, 2014
    Hi Bell Bloke here, you know the poor sod with the 'Bad Engine Noise''
    Well belts sound like that and so do bearings sometimes, even a leaking exhaust valve, but my money is on a cracked manifold firstly or exhaust system second.
    You may have to let it get worse before you find it...
     
  25. SeanPeterLynch

    SeanPeterLynch Karting

    Jun 17, 2014
    187
    #25 SeanPeterLynch, Aug 2, 2014
    Thanks Guys. Appreciate your insight. If any others have views appreciate them.
     

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