Engine rattle @ 2800rpm under load (different than the other 2800rpm issue)
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This is a discussion on Engine rattle @ 2800rpm under load (different than the other 2800rpm issue) within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; 2012 base, no mods. Easiest to notice the noise in 2nd & 3rd gears. Cruise along around 2800rpm and then ...

  1. #1
    Registered User etnpnys's Avatar
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    Engine rattle @ 2800rpm under load (different than the other 2800rpm issue)

    2012 base, no mods.

    Easiest to notice the noise in 2nd & 3rd gears. Cruise along around 2800rpm and then floor it to put the engine under load and a rattle-like noise starts happening and goes away around 3300rpm.

    Any ideas? Totally under warranty, just want to have an idea when I take it in.
    "Ah, it is the fault of our science that it wants to explain all; and if it explain not, then it says there is nothing to explain."
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    Registered User DorBink's Avatar
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    I had a similar scenario when a bolt feel off my turbo to down pipe. But that was my fault for not tightening it properly. If you are under warranty I'd have subaru look for the problem. There techs will probably have heard it before and can diagnose it.

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    Village Idiot McBill's Avatar
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    Can you take a video of the noise. There are an awful lot of things that can make a "rattling" noise...
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    Registered User etnpnys's Avatar
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    Quote Originally Posted by McBill View Post
    Can you take a video of the noise. There are an awful lot of things that can make a "rattling" noise...
    As soon as I get it back from the body shop, yes...

    Something on the road kicked up and smacked my front bumper, cracking it in one spot, breaking a bracket, and forever losing the cover that goes over the tow hook spot. God bless Los Angeles.
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    Admiral Ackbar the 1st mycologist's Avatar
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    Like the sound of the balls in the bottom of a paint can when you shake it?

    What was the other issue at 2800?
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    Registered User etnpnys's Avatar
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    Quote Originally Posted by mycologist View Post
    Like the sound of the balls in the bottom of a paint can when you shake it?

    What was the other issue at 2800?
    No, it's not that noticeable. I don't think it came through quite right with my video, so I'm probably just going to have to take it in to the dealership. It's so quiet in this video...

    Noise? - YouTube
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    Registered User nsibanez's Avatar
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    Ya its really hard to hear in my phone.
    Best advice I could say is to look for loose bolts, especially on heat shields both on the turbo and under the vehicle

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    Registered User etnpnys's Avatar
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    Quote Originally Posted by nsibanez View Post
    Ya its really hard to hear in my phone.
    Best advice I could say is to look for loose bolts, especially on heat shields both on the turbo and under the vehicle

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    Perfect I will start there.
    "Ah, it is the fault of our science that it wants to explain all; and if it explain not, then it says there is nothing to explain."
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    Registered User nsibanez's Avatar
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    If you can get someone to rev the engine for you too. It'll help pinpoint the location easier

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    Registered User etnpnys's Avatar
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    Quote Originally Posted by nsibanez View Post
    If you can get someone to rev the engine for you too. It'll help pinpoint the location easier
    See, it only does it under a load though.... So it might be a vibration issue but I think it's unlikely...
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    Last edited by etnpnys; 05-19-2014 at 08:18 AM.
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    Registered User nsibanez's Avatar
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    oops
    In my experience though...If it's just a heat shield or loosened bolt... The vibrations at certain rpm ranges will either quiet them or make them rattle

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    Admiral Ackbar the 1st mycologist's Avatar
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    I can't hear it with good headphones.

    Is this new or could it be just that you are noticing it for the first time?

    The wastegate will flutter in that RPM range - are you at around 8-10psi when you hear it? It should be more prominent at part throttle though.

    You could be getting some detonation in that RPM/Load range. Is it still hitting full boost or any signs that the IAM might be down? I'd want to log it even if it were hitting target. You can very easily see where there is detonation where it pulls timing or if the IAM is down. This will happen for example if you have loose clamps on the intake tract between the MAF and the turbo.
    "From a little spark may burst a mighty flame." - Dante
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  14. #13
    Registered User etnpnys's Avatar
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    Much appreciated, everybody. Myc, I'll look into that. I can't log it because I have no tools to do so with (and it's the stock tune). I have the Torque Android app, though, so I should be able to see boost levels and such.

    It feels like it's running fine - I just get that quiet weird rattle. Admittedly, I didn't think you guys would be able to decipher it in the video. I can hear it there, but that's because I know exactly what I'm talking about.
    "Ah, it is the fault of our science that it wants to explain all; and if it explain not, then it says there is nothing to explain."
    -Van Helsing, from Bram Stoker's ​Dracula

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