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#1
16th January 2014, 11:12 AM
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Diagnosing RPM related high pitch whine/noise
Hello all,
My D2 FL suddenly developed a high pitch whine, which can be clearly heard when I sit in the car while the car is parked. Noise is clearly RPM related, but it is difficult to say where the noise comes from. Not even sure at this stage if it is from the front or from rear of the car. I appreciate there is nothing from rear that can generate RPM related noise, but simply judging by ears it is impossible to say where it comes from... It is high pitch whine that kind of disappears with higher RPM perhaps because frequency goes so high that it becomes undetectable by human ear. Engine is revving a bit after 2000-3000 rpm, so it hides the noise too. I tried to switch aircon on and off and play with steering wheel. Noise pattern does't change when I do that. It seem to be RPM related only. * Is this bearing noise? No bearings in my car were changed yet. * Can the RPM-related noise/whine be generated by smth other than bearing? * In your experience which bearings fail first on D2? Any usual suspects? * What are the best methods to isolate and diagnose problem? * Any great tools I can buy that will help me to listen and isolate sources of noises/whines? Any advice will be appreciated.
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I'd rather drive on left Last edited by notorious; 16th January 2014 at 11:23 AM. 
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#2
16th January 2014, 02:56 PM
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Quote:
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2002 Final Edition S8. Ebony black with Silver Grey leather and myrtle wood trim. Current mods: solar sun roof, 20mm rear spacers, 15 mm on front, red brembo callipers, 6k headlights, rear view camera, engine remap, alloy dash dial rings, alloy navi rings, tt/phaeton pedal upgrade, (and custom matching foot rest) dension ipod interface & parrot hands free kit (both fully hidden), av input, tv in motion switched thro' PF switch in blanking plug right of steering column, Audi 'quattro' sill covers, repositioned centre console switches, radio clock, .Planned mods: auto-dimming rear view mirror, dash cam (as steamship's), fit the ski hatch, refit philips drl's (or maybe not - nope, definitely not - horrible botch!).
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#3
16th January 2014, 03:29 PM
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I'd rather drive on left
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#4
16th January 2014, 11:00 PM
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High pitched whines i my experiences have turned out to be bearings on things like fan belt jockey wheel /Idler Pulleys.
Once you your ear thing comes it will be easy to pinpoint it if it is a bearing race complaining. You could try the old screwdriver handle held to your ear with the tip resting against the area you want to listen too.
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Del 
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#6
17th January 2014, 07:17 AM
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Sergey, you could also try just removing auxiliary belt from the crank pulley, run engine for a few minutes on battery only, if no noise it was something on the auxiliary belt.
I did this method on my previous S8. I had 2 noises, one was a timing belt roller, the more fain noise was the water pump.
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#8
17th January 2014, 03:31 PM
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It was very easy, if I remember correctly I reduced the tension on the tensioner and only removed the belt from around the crank pulley, making sure it wouldnt get caught in it with engine running. I left it on all the other auxiliaries, too lazy to take it off completely.
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#9
17th January 2014, 06:36 PM
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And when I put the belt back how do I make sure it is correctly tensioned?
Is the tensioner automatic with a spring or should I just pre-tension it by hand and then tighten a bolt?
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I'd rather drive on left
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#10
17th January 2014, 08:10 PM
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Very good point. Here is the Elsa Win guide for a 2001 3.7 A8.
I need to copy all of these instructions to PDF / Word at some point. Have a careful read through, to me it seems the belt is simply tensioned by releasing the tensioner locking tool (or a drill bit, etc). "fit onto tensioning roller last" Last edited by Goran; 17th January 2014 at 08:14 PM.
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