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2G Weird rattle sound at around 3k rpm

Posted by Lorelon, Nov 13, 2019

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  1. Lorelon

    Lorelon Probationary Member

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    Joined Feb 6, 2019
    Sofia, Europe
    Hi guys, what's good?

    When I start driving my eclipse 2g turbo
    I get this weird rattle sound at around 3k rpm
    and if I go to 4k and above the sound goes away!
    Another thing that I noticed is that it usually happens when the engine is still not warmed up (at the beginning of a drive)
    Any ideas what might be causing the sound?
     
  2. Kai Hefner

    Kai Hefner Freelancer

    237
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    Joined Jun 21, 2018
    Calgary, AB, Canada
    Do you have a video? Any idea what general area the rattle sounds might be coming from?

    Your initial post is a bit generic, it's difficult to help; however, my first guess would be something in/around your exhaust. That guess isn't based on much though, we need more info.
     

    Street Build 393  1

    1995 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM

    Road Race Build 661  2

    1998 Eagle Talon TSi AWD
    awd · manual · 2G DSM
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  3. Lorelon

    Lorelon Probationary Member

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    Joined Feb 6, 2019
    Sofia, Europe
    Sorry, I feel like it's from the engine bay
    I won't be driving the car for the next week so no video
     
  4. Lorelon

    Lorelon Probationary Member

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    Joined Feb 6, 2019
    Sofia, Europe
    I don't think it's the exhaust as the sound is tightly related to the rpm and how warm the engine is
    Usually after 2 minutes of driving the sound completely disappears but I feel like it might turn into a bigger problem if I don't figure out what's going on
     
    Last edited: Nov 13, 2019
  5. Kai Hefner

    Kai Hefner Freelancer

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    Joined Jun 21, 2018
    Calgary, AB, Canada
    I still think we need more info! It could be a lot of things. If you're not driving the car it's okay we can wait ROFL. Just bump the thread with a video when you do.

    Can you simulate the rattling when the car isn't moving by revving the car in neutral?

    I've seen exhaust rattling that happens at certain rpms. Weird stuff happens sometimes.
     

    Street Build 393  1

    1995 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM

    Road Race Build 661  2

    1998 Eagle Talon TSi AWD
    awd · manual · 2G DSM
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    609DSM likes this.
  6. Lorelon

    Lorelon Probationary Member

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    Joined Feb 6, 2019
    Sofia, Europe
    Hmm that's actually a very good question
    To be honest I can only hear the sound when the car is in motion

    Imagine the car vibrating at 3k rpm and then when you exceed that it stops. I am not even sure that I can capture it on video

    It's usually for 2-3 mins after I start driving but one time it got really bad and I was barely able to drive my car. Not sure if it's leaning out but the car was popping like crazy and I wasn't able to give it gas

    The car is also somewhat modified at 18 psi
     
  7. Kai Hefner

    Kai Hefner Freelancer

    237
    100
    Joined Jun 21, 2018
    Calgary, AB, Canada
    Ah ok, now we're on the right track. I think this sounds like a vacuum/boost leak.
     

    Street Build 393  1

    1995 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM

    Road Race Build 661  2

    1998 Eagle Talon TSi AWD
    awd · manual · 2G DSM
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  8. Lorelon

    Lorelon Probationary Member

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    0
    Joined Feb 6, 2019
    Sofia, Europe
    Thanks for the suggestion
    I'll check that
     
  9. BLACK'98DSM

    BLACK'98DSM Proven Member

    1,040
    337
    Joined Feb 9, 2019
    Hoover, Alabama
    I had similar problems with a bad intake manifold gasket.
     

    Road Race Build 2K  25

    1998 Mitsubishi Eclipse N/T
    fwd · manual · 2G DSM

    390  3

    2012 Murray Explorer Dune
    rwd · automatic · Misc Vehicles

    297  6

    2009 Troy Bilt Bronco
    rwd · automatic · Misc Vehicles
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  10. motomattx

    motomattx Proven Member

    1,919
    675
    Joined Dec 9, 2010
    wampum, Pennsylvania
    Could be piston slap, or even rod or balancer bearings.
     

    Drag Race Build 3K  24

    1995 Mitsubishi Eclipse GST
    fwd · manual · 2G DSM
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  11. tk106

    tk106 Supporting Member

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    Joined Sep 11, 2017
    Cincinnati, Ohio
    Video would really help or this will become a guessing game
     

    171  3

    2000 Jeep Cherokee Sport - Classic
    awd · automatic · Misc Vehicles

    173  4

    93 Civic 4 Door -sold-
    fwd · manual · Misc Vehicles

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    1992 Eagle Talon TSi AWD
    12.625 @ 111.42 · 1G DSM
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  12. Lorelon

    Lorelon Probationary Member

    13
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    Joined Feb 6, 2019
    Sofia, Europe
    For me a boost leak makes sense
    I feel like there is a problem with the air fuel mixture
    Next week I will upload a video but for now I have the transmission out so no way to drive it
     

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