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Thread: Scraping noise when accelerating

  1. 3rd January 2011, 07:22 PM #1
    jiri_j
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    Scraping noise when accelerating

    Hello guys,

    first of all: Happy New Year to all of you :-)

    Just returned back home from a Xmas trip and when climbing steep curvy roads up from the coast, I experienced a scraping/creaking noise most likely coming from the engine bay. The noise picks up when the engine is under a heavy load - this is when climbing a steep hill on 1st or 2nd gear or when quickly accelerating. I can duplicate the noise easily by accelerating and pushing the brake pedal the same time. I uploaded a short file onto the following link (you can play it in e.g. windows media player, please let me know if you have any difficulties with that): [ame]http://rapidshare.com/files/440526982/VOICE018.LGV[/ame]
    The noise I have in mind starts at 10.5 seconds of the recording.

    It seams to me like metal to metal scraping noise (a worn bearing ??? or something similar).

    I can hear the noise only inside the car. I tried accelerating with opened windows, or with opened hood and a person listening from outside, and there is no way to hear the scraping noise - this is most likely because it is masked by the engine noise. Noise is more frequent when the engine is warm. There is no noise when rewing the engine and the car is steady.

    The truck in particular is D2 V8 manual with 165t km. I checked the engine bay, and except a slight head gasket coolant leak (the area around the PAS pump) I haven't found anything. I checked the exhaust manifolds for broken bolts, changed the Y-pipe gaskets, changed spark plugs, changed engine oil, greased propeller shafts, checked pulleys, wheels, nothing worked so far. Note that I have an engine oil pressure gauge, the oil pressure is perfect. Please could you help to identify what might be causing this noise?

    Where to start?

    Please help!

    Thank you all,
    regards
    Jiri
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  2. 3rd January 2011, 07:27 PM #2
    catch-22
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    something to do with the water pump maybe?
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  3. 4th January 2011, 05:16 AM #3
    Discobaker Guest
    Engine mounts?
    Exhaust shield plates? The plates welded to the pipes to protect the cats came off one side on my V8, sounded horrible & expensive & it would occur only when the motor was under load.
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  4. 4th January 2011, 08:40 PM #4
    jiri_j
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    Scraping/grinding noise when accelerating

    Thank you all for your help!

    Based on your tips guys I have done some further checks: I checked the engine mounts and transmission mounts - everything fine here. I went through all hoses and shields in the engine bay and checked exhaust shields, nothing here. I checked the fan for rubbing without success.

    It seems to me more and more that the noise is more like 'a worn bearing' noise. As I said I checked all the pulleys, but since the noise comes at higher RPMs and when the engine is under load I am thinking about a further check.

    Is there anything wrong if I take out the serpentine belt and try a quick accelaration on a side road without it, when the engine is still cold (like 40-50 'C)? I need 1 minute maximum to drive the truck to simulate the noise. This would confirm/eliminate a noisy pulley. Is this safe to do in terms of the engine temperature?

    Thank you again! Hope someone will be able to help :-)
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  5. 4th January 2011, 08:45 PM #5
    catch-22
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    Nothing wrong with doing that but boy will it be hard to steer
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  6. 4th January 2011, 08:53 PM #6
    jiri_j
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    Quote Originally Posted by catch-22 View Post
    Nothing wrong with doing that but boy will it be hard to steer
    Thanks mate, I will pick a straight side road. No need to use steering at all :-) I will report the results soon.
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  7. 4th January 2011, 09:39 PM #7
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    Fluids
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    Check your front tailshaft universal/DC join at the transfer case ...
    Kev..

    Going ... going ... almost gone ... GONE !! ... 2004 D2a Td5 Auto "Classic Country" Vienna Green

    2014 MUX LST with fruit
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  8. 5th January 2011, 08:00 PM #8
    trev
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    scaping/grining noise

    Sorry! sounds obvious I Know,but have you looked at your brake Pads?

    Trev.
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  9. 6th January 2011, 07:42 AM #9
    jiri_j
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    Thank you guys. Just a quick update: The noise is getting worse and more frequent. I have done further checks and found out that the noise is not related to the driveline and transmission. Will check the pulleys again even though it was the first thing I did. It is very confusing since the noise appears at a high engine load only.
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  10. 6th January 2011, 09:39 PM #10
    dutchviking
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    Could well be your viscous fan on its way out. Or its bearing in the front cover.
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