Is this rod knock / worn bearings? Everyone tells me it's fine!
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This is a discussion on Is this rod knock / worn bearings? Everyone tells me it's fine! within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; Car has been making this strange noise for several months now without any other symptoms. I've taken to the dealership ...

  1. #1
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    Unhappy Is this rod knock / worn bearings? Everyone tells me it's fine!

    Car has been making this strange noise for several months now without any other symptoms. I've taken to the dealership and a pro tuning shop and neither seemed concerned, but there's clearly something wrong with it. I'm freaking out and contemplating reverting to stock and trading it in to the dealership while they still want it, (and they do want it really bad).

    https://www.youtube.com/watch?v=TpehxuiEE9c
    https://www.youtube.com/watch?v=sfT3nKY6E7w

    I'm just completely confused because my logs are clean, it's boosting fine, has tons of power, it's not burning oil, I'm not hearing that classic loud rod/bearing knock, there are no heat-shields left to rattle, the mounts are fine, but it just doesn't sound healthy and I cringe every time I give it a high rev and check... and it's been doing this since the beginning of May at the latest!

    Background:
    2012 WRX
    27k miles
    Rotella T6 5W-40
    First tuned in May of 2013.
    Always warmed up before boost.
    Not burning more than 1/2 qt / 3k miles.
    No heatshields left, except for catback shield.
    Datalogs are clean, with no FBKC or FLKC.
    Hitting 19psi consistently and easily.
    No apparent lose in power, pulls harder than ever, it seems.
    Clutch will occasionally slip if you go WOT on a cold night, up a hill, etc. Otherwise, it holds fine.

    Performance Mods:
    Torqued Performance Stage III tune + Header
    Perrin ELH & Uppipe
    DSS Carbon Fiber Driveshaft
    Denso Iridium One Step Colder Plugs
    AEM CAI
    Process West TMIC
    Forge BPV
    Grimmspeed EBCS
    Invidia Catted DP
    PTP Lava Turbo Blanket
    DW65c Fuel Pump
    Group N Engine Mounts
    Kartboy Short Throw Shifter & Bushings
    Kartboy Pitch Stop Motor Mount

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  3. #2
    zax
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    I hear nothing abnormal.

    If your concerned, get a UOA asap.
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  4. #3
    Village Idiot McBill's Avatar
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    Sounds good to me, can't tell anything is wrong from the video. If it's any consolation, My valves in my 2011 wrx are sort of loud. At least louder than I would expect for most cars but I've had it into a dealership for an inspection and they said everything looked and sounded fine. And they also said its one of the best conditioned 2011's that they have seen with that kind of mileage on it.
    2011 WRB WRX Sedan - Q300, Invidia Catted Downpipe, Cobb RAM Intake w/Box, Protuned buy TiC
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  5. #4
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    Asharus found the source of my "rod knock" in chat (He knew it immediately when I said "I can feel it through the pedals too")







    Gosh I feel stupid. How did I miss this?! phew!

    This is explains everything though, like why it got worse over time, why it started a few months ago (fixed an intercooler leak), why my steering wheel vibrates a little, why the stock pitch stop made it worse, why I could only really hear it from inside and while the windows were rolled up, why it didn't really do it much under load, etc.

  6. #5
    Registered User Asharus's Avatar
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    now you can sleep at night again
    2011 WRX Limited w/ Nav, Performance Auto Solutions Tuned by Dave - 349awhp 366 ft/lbs @ 19psi E85
    Enkei PF01s, AEM Intake, PW TMIC, TS Kompact BPV, Invidia Q300 Catless Turboback, GS EBCS
    GS Uppipe, Tial MV-S 38mm EWG, FIC 1100cc Injectors, DW DW65c FP, PTP Turbo Blanket, Zeitronix ECA Gauge
    AEM Wideband & Boost Gauges, SMY Cluster, SPT Short Throw Shifter/Bushing, Anarchy Motive Shift Knob, 30% Tint

  7. #6
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    I spoke too soon...

    The pedal vibrations are gone, which is a HUGE deal for me, still endless thanks for pointing out that fix, but the other sound is still very much there.

    At this point, I think the only thing I can do is get a UOA next oil change, and cut open the filter. Something, somewhere, is still buzzing around inside of something and making a racket.

  8. #7
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    welp, the car is still alive and kicking, pulling harder than ever, over-powering the clutch and everything... and the evil rod-knock noise persists.

    Still haven't had a chance to do a UOA, but soon... So sick of worrying about this thing.

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