HELP! "whining" noise on cold start?
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  1. #1
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    HELP! "whining" noise on cold start?

    ok, so its now winter and consistently below 0 degrees celcius here. whenever i start the car (its a 1998 gls 30v v6 with tip) i get a rather loud whining noise like an electric fan is running, but once the car warms up, and the idle drops again, the noise is gone. the noise seems to be coming from below my airbox, but i can't figure out what it is. anyone ever hear of something similar to this? (BTW, this is my first winter owning this car, so everything about it is new to me)

    thanks!

    Nathan

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  3. #2
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    Nathan, my only guess would be the power steering pump. In the morning fire it up and turn your steering wheel and see if the noise changes at all.

  4. #3
    watchout, he'll put Viagra in your M&Ms
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    Without hearing the whining you describe, it's tough to be certain. But I have two B5.5's and they both make a whining noise when they're started in the cold (especially below 30 degrees farenheit.) They both quiet down after about a minute of warmup. And they both have done this since new.

  5. #4
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    Yeah, tough to say for sure without hearing it. Maybe clutch on cooling fan?

    Don

  6. #5
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    Could be a lot of stuff. I just noticed a whurr recently and my mechanic traced it back to the alternator... lots of spinning stuff in there...

  7. #6
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    Could also be a dying secondary air injection pump.

    If the sound has a finite beginning and end, it is most likely this part.

  8. #7
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    Quote Originally Posted by Rabbit
    Without hearing the whining you describe, it's tough to be certain. But I have two B5.5's and they both make a whining noise when they're started in the cold (especially below 30 degrees farenheit.) They both quiet down after about a minute of warmup. And they both have done this since new.
    same here, 2004.5 1.8T.

  9. #8
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    Quote Originally Posted by Sharky
    Could also be a dying secondary air injection pump.

    If the sound has a finite beginning and end, it is most likely this part.
    this can be activated using a vagcom output test, right? next cold morning (ie tomorrow) I'd like to try and spin up the pump (if possible) prior to starting the motor to rule out the air pump....and see if it is a part that is spun by the serpentine belt.

  10. #9
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    Quote Originally Posted by scotty_passat
    this can be activated using a vagcom output test, right? next cold morning (ie tomorrow) I'd like to try and spin up the pump (if possible) prior to starting the motor to rule out the air pump....and see if it is a part that is spun by the serpentine belt.

    Yep, you sure can run it with VagCom.

  11. #10
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    this here 2000 1.8T
    i think it's just warming up
    noise gone after 30 sec

  12. #11
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    yeah its just the COLD START on our cars i think every newer VW 00+ have it, it does it one, goes away, does it again, goes away, then ur good to go.......atleast on my car

  13. #12
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    Mine does the same. After replacing all my belts and stuff this Friday I'm curious to see if it changes or goes away.

  14. #13
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    Secondary air pump. Mine did this all last winter until I tore into it and found some scale lodged in it. Once the scale was removed, no more noise. Remember, the air pump runs for roughly 30 - 45 seconds on start-up then shuts off. It is used to help oxygenate (burn) raw fuel to protect the catalytic converter. These are expensive little devils to replace. Good luck!

  15. #14
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    Agree, most probable cause is air pump.

  16. #15
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    ok... to try and describe it better:

    if you have ever heard a plane with a jet engine "idle" or taxi down a runway, it sounds like that. a high whining noise.

    and i'll verify 100% on this tomorrow but i'm 99% sure it makes this noise from startup until the car is warm and the idle returns to normal (not on fast idle anymore), and once it turns to regular idle, the noise is gone, never to be heard again until next cold start...

    ssoooo????

    by the way, thanks a lot to everyone who has posted already in this thread, as well as any of my other threads!

  17. #16
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    Yep, mine too (B5 1.8T), though have noticed that air pump does not come on during cold start when it's around or below freezing (have seen posts in this regard as well, though don't recall seeing confirmation that "yep, there's a low temp cutoff and it's thus and so"). Sounds like a jet engine, kicks in about 2 sec after ignition, takes about 5 sec to wind up, holds there for 5-10 sec, & takes about 5 sec to wind back down. Noise most likely is the pump itself, but it could also be the motor driving the pump, or, if the air is being injected into the exhaust upstream of the turbo, maybe it's forcing the turbo to spin faster by pumping more volume through the exhaust side. (Any thoughts on this last one, those of you who know the turbo plumbing inside and out?)

  18. #17
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    yeah, what dave describes sounds exactly like mine, only mine stays on a LOT longer. as long as it takes for the idle to drop down... anyways, i'll be tearin into it tomorrow to get to the air pump tomorrow and ill let you all know what i see in there (and ill probably be back with more questions haha)

    nathan

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