High pitched whine in 2001 H6 OB

Discussion in 'General Motoring' started by Paul Chan, Oct 31, 2004.

  1. Paul Chan

    Paul Chan Guest

    I have a 2001 H6 VDC Outback, 75k miles on it. Bought it new off the
    dealer lot so I know the full history of the car. No accidents, mods,
    etc.

    Over the last 3-4 months, I have been noticing a whine which seems to
    come from forward of the passenger compartment. Been trying to narrow
    down the cause of this but the best I have been able to do is
    determine that it only comes on when the engine is under load/open
    throttle. If I'm driving on the freeway, it comes and goes as I
    press/release the accelerator. While on cruise control, it also comes
    and goes when the car is trying to accelerate uphill, etc. Am certain
    it does not correlate to engine speed. If I release the accelerator at
    70mpg (and note that rpms stay high), the whine goes away immediately.

    Took it to the dealer but they have been unable to trace it. They hear
    the same during the roadtest but when they had it up on the rack and
    doing 40-50mph, cannot find the noise.

    My thoughts are that is has somehow to do with the fuel pump,
    injectors, throttle and some bad grounding perhaps? Any other thoughts
    or similar experiences?

    Thanks!
     
    Paul Chan, Oct 31, 2004
    #1
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  2. Paul Chan

    hippo Guest

    Diff sounds like a possible starting point. Get them to test drive it while
    you go along - or ride in while you drive it - then you can point out
    exactly what you mean.

    BTW - I assume you've left your mother in law at home on these occasions
    ... Cheers
     
    hippo, Oct 31, 2004
    #2
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  3. My 2002 H6 LLBean did the same thing you described
    for the first 20K miles, and then stopped making the noise
    all together. I do notice a bit of whine coming from my
    power steering pump, but this is at low rpm.
     
    Skweezieweezie, Oct 31, 2004
    #3
  4. Paul Chan

    Alan Guest

    I have on 04 OBW with the H6 3.0. I have the same problem, but have been
    ignoring it. I have about 25K on the car. It is definitely related to
    applying the accelerator- almost as if you are hearing the fuel pump or
    injectors something. If you find out what it is, let me know- I'll do the
    same.
     
    Alan, Nov 1, 2004
    #4
  5. Paul Chan

    brusbrother Guest

    I recently noticed the exact same symptoms on my 2000 legacy GT. So far no
    solution and I've also posted on other sites. I'll email if possible to
    keep the issue alive.
     
    brusbrother, Nov 2, 2004
    #5
  6. Paul Chan

    brusbrother Guest

    I posted elsewhere and one suggestion was the center diff and followed with
    the suggestion that I just get used to it. I am still covered under a 100K
    warranty and since it is a recent development I would like the dealer to
    make it stop!
     
    brusbrother, Nov 3, 2004
    #6
  7. Paul Chan

    k. ote. Guest

    Hey all. Since you haven't actually described the problem in any
    significant detail, there seems to be a problem with the side-view mirrors
    in most (if not all) of the Subarus that I've been in, where airflow
    around the mirrors generates a horrible, heart-stopping whine at speed, or
    if there's a crosswind with *just the right* speed or characteristics at
    slower speeds.

    I say heart-stopping because that kind of noise, heard for the first time
    on a Subaru, is heart-stopping.

    Try folding your mirrors in and seeing if this fixes the problem. If so,
    you can rest a little easier, and work on finding a mod for your mirrors
    that stops it. In the meanwhile I just fold my mirrors in when I need to
    go fast(er).

    The lowest speed mine've whined at is around 140kph in a stiff cross-wind
    across the highway.

    You know, I almost think it's a sneaky way Subaru cars were designed so
    the dealer knows with good accuracy that the driver is taking the car up
    to pseudo-legal speeds.

    Good luck in any event!
     
    k. ote., Nov 3, 2004
    #7
  8. Paul Chan

    brusbrother Guest

    I spoke to a friend who is a former master tech for SOA. While he has seen
    a number of these issues with sound that indeed may be related to center
    diff., it never proceeds to anything worse. If it is a minimal sound SOA
    will do nothing. Nonetheless, get in on your service record if you are
    still in a warranty period.
    Have any of you changed the diff fluid? That gear oil smells nasty from
    the start so I'm not sure how to tell when it goes "bad".
    I wonder if that can really be the culprit since?
     
    brusbrother, Nov 4, 2004
    #8
  9. Paul Chan

    hippo Guest

    <<Hey all. Since you haven't actually described the problem in any
    significant detail, there seems to be a problem with the side-view mirrors
    in most (if not all) of the Subarus that I've been in, where airflow around
    the mirrors generates a horrible, heart-stopping whine at speed, or if
    there's a crosswind with *just the right* speed or characteristics at
    slower speeds.>>

    That would explain why it's not replicated on a hoist but *not* why it's
    throttle and load sensitive on the road.

    Reason I orignally suggested checking diff (particularly correct side
    loadings BTW) is that it *will* be affected by load and throttle. it won't
    happen on a hoist if the wheels are hanging free because there's no thrust
    loading on the drivetrain like you'd get on the road. My 2c worth anyway!
    Try it - it can't hurt.

    Australian spec cars have scheduled change for *all* fluids at 80,000Km -
    50K miles / 2 years (except oil - 12500Km), so I'd say it may be looooong
    overdue if it's not been done yet. Cheers
     
    hippo, Nov 4, 2004
    #9
  10. Paul Chan

    k. ote. Guest

    In my case, the throttle and load changes the angle of the car and can
    affect the noise significantly. When I'm right at the "sweet" (or sour?)
    spot, I can tromp on the gas and start it, or let go of the gas and stop
    it. Airflow is a tricky thing to modulate.
    =]

    Well, it's easier to check the mirrors first anyway, and far less
    expensive.
     
    k. ote., Nov 4, 2004
    #10
  11. Paul Chan

    Losiho Guest


    I hate to be pedantic, but Australian spec cars have their major service /
    all fluids changed every 50,000km / 30,000 miles. :)
     
    Losiho, Nov 5, 2004
    #11
  12. Paul Chan

    hippo Guest

    <<I hate to be pedantic, but Australian spec cars have their major service
    / all fluids changed every 50,000km / 30,000 miles. :)>>

    Oops ... of course you're right. That's not pedantry on your part though -
    just carelessness on mine for hitting enter without checking while I was
    reading up on an 80K service for something else. Silly me. Thanks
     
    hippo, Nov 5, 2004
    #12
  13. Paul Chan

    Paul Chan Guest

    Thanks for the heads-up folks. I'll get them to look at the diff fluid
    next time. It is due for a fluid change anyway. I hope this addresses
    the problem.

    The dealer that I go to in Santa Cruz has actually be really nice over
    the last 4 years whenever I brought my car in. Let's hope it works
    this time. Will keep you all posted.

    Thanks!
     
    Paul Chan, Nov 9, 2004
    #13
  14. Paul Chan

    brusbrother Guest

    Test drive by SOA of my 2000 Legacy GT today suggests "normal" transmission
    sound. Tech suggested it could be in the diff or planetary gear of the
    tranny and was aware of the "condition". My diff and tranny fluid is 3K
    shy of the 30K change so I will do an early change and see what happens.
    It only started in the last 3 months and I'm not too thrilled.
    On a bright note, covered under my extended warranty, I realized that wind
    noise was associated with the mirror and they now have an updated gusset
    that totally eliminated the noise on the driver's side! Next visit... the
    passenger side.
     
    brusbrother, Nov 10, 2004
    #14
  15. Paul Chan

    chanpaul2000 Guest

     
    chanpaul2000, Dec 21, 2004
    #15
  16. Paul Chan

    chanpaul2000 Guest

    I just got back from Subaru. Transmission, front and rear diff fluids
    all changed. Whine is still there as ever. I guess that eliminates on
    thing.

    Has anyone been able to determine if this has to do with the fuel
    pump/injectors? It correlates with application of throttle and I can
    only think of that right now.

    Thanks.
     
    chanpaul2000, Dec 21, 2004
    #16
  17. Paul Chan

    Alan Guest

    It sounds more like a fuel-related noise to me- the pump or injectors as you
    suggest. Probably the pump.
     
    Alan, Dec 21, 2004
    #17
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