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  1. #1
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    Nasty noise at idle, which goes away when moving. Cam belt change fix?

    Hi everyone,

    I dropped my car at Audi this morning because for about a week it's been making a nasty noise at idle, which goes away once I start moving. They have just come back to me and told me that they want to change the cam belt and that will 'probably' fix the problem. Can a dodgy cam belt cause a noise at idle that would go away once moving?

    They want Ł399 + ~Ł100 for the water pump, which i've read it's worth changing at the same time.

    Thoughts?

    Yours,
    Jim
    A3 8P 2.0 TDI (140ps) Sport DSG
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  3. #2
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    I had a 05 a3 2.0 140 dsg last year and had same thing. got my dad to have a look and noise only happened in park or nutreal. I had audi have a look and they suggested to service box so i spent 180 with them and the noise went away for couple days. so off that ad say gearbox troubles mate. car did it for 6month of owning it. I began to get the turbo playing up with limp mode so i got shut.

    Hope this helps

  4. #3
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    THanks for the reply. Audi phoned back a while ago to say they now think that it's a problem with the alternator. Is there a mechanism that engages the alternator only when the car is moving? I thought it was linked to the engine so that it was running when the engine is running? I suppose my question is - could a problem with the alternator make a noise whilst at idle but not whilst moving for some reason?? Odd.
    A3 8P 2.0 TDI (140ps) Sport DSG
    Factory | Sunroof | Xenons | Cruise | Parking sensors | Headlight washers | Red Vienna leather | Bose | Piano black inserts | Heated Seats | Electric lumbar | Front Arm Rest
    Retro | S-Line roof spoiler | 18" RS6 | Angel Tuning remap | ITG Performance Air Filter | RNS-E + Bluetooth | Tomtom iPhone car kit | Removable tow bar
    In progress | Ashtray deletion | Factory matched tints
    Wish list | MFSW | Auto wipers/lights | Auto dimming mirrors | Folding mirrors

  5. #4
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    Penjn, the alternator is engaged all of the time, unlike the aircon compressor which has a clutch. The alternator at engine idle is probably not providing much electrical current, and is therefore not loaded very much. At running speeds it is generating more current and so that makes more resistance to its rotation. Could change the noise characteristics, although I have never heard it happen this way. As the alternator is so accessible, let Audi play with it. They will very quickly find out if the alternator is the problem. Good luck mate.
    French A3 Sportback 2006, 2.0L 140 TDI, DSG, RSN-E, Ambient lighting, Auto-lights/wipers, Reverse assist, Dolphin Grey, 17" wheels, Leather seats, Cruise control, Roof bars.

  6. #5
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    The alternator will have a free-wheeling pulley which has a one way clutch inside of it. they are known to make a noise when the pulley gets some age on it.
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  7. #6
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    Quote Originally Posted by Geraldy212 View Post
    Penjn, the alternator is engaged all of the time, unlike the aircon compressor which has a clutch. The alternator at engine idle is probably not providing much electrical current, and is therefore not loaded very much. At running speeds it is generating more current and so that makes more resistance to its rotation. Could change the noise characteristics, although I have never heard it happen this way. As the alternator is so accessible, let Audi play with it. They will very quickly find out if the alternator is the problem. Good luck mate.
    Very interesting. Changing the alternator pulley fixed the problem. Audi charged Ł240.00 for the investigation of where the noise was coming from. Doesn't this seem a bit much if the alternator isn't buried deep in the bowels of the engine compartment?
    A3 8P 2.0 TDI (140ps) Sport DSG
    Factory | Sunroof | Xenons | Cruise | Parking sensors | Headlight washers | Red Vienna leather | Bose | Piano black inserts | Heated Seats | Electric lumbar | Front Arm Rest
    Retro | S-Line roof spoiler | 18" RS6 | Angel Tuning remap | ITG Performance Air Filter | RNS-E + Bluetooth | Tomtom iPhone car kit | Removable tow bar
    In progress | Ashtray deletion | Factory matched tints
    Wish list | MFSW | Auto wipers/lights | Auto dimming mirrors | Folding mirrors

  8. #7
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    You got of litely mate, quick run before they find the real bill dropped under the printer tray, Ł240 is nothing.

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  9. #8
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    Most local garages could have told you it was pulley. Think they are Ł40-50 brand new. Audi dealership are full of sh*t. They charge for plugging in diagnostics even when they know there wont be a fault code and last time i checked this was 110+vat. If you dont know much about cars trust me dealership have a great field day with you


    A3 2.0 TDI Optics Black S-Line, FR&RTuning Stage 3! GT20 Hybrid Turbo, THS TFSI FMIC, Sachs performance clutch kit+SMF, Milltek 2.5" Turbo-Back Non-Res Exhaust, ITG Maxogen Induction, EGR Delete with FR&RTuning Map out, Custom Black 18" RS4, 35mm H&R springs, S3 brakes, EBC Yellowstuff, front splitter, HID Xenons, S3 tailgate Spoiler, 09 Rear Lights, Retrofit Audi Ipod, S3 Air vents, Bose sound+retrofit JBL Subwoofer 1200W.
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