Question about 2002 Audi A4

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Audi A4 Quattro (2004) bumping/knocking from manual transmission

Occurs at low speeds, most obvious in 1st gear, also in 2nd gear, less obvious in 3rd gear, not apparent in 4th, 5th, 6th gear so maybe torque-related? Occurs in straight lines, no worse around corners. Occurs randomly, no obvious pattern to it, but worse with load on engine, e.g. uphill. Seems to be coming from rear axle, but could be from 4WD differential (not sure). Slowly getting worse. Audi technicians not sure what it is without major investigation. The bump/knock sounds & feels just like the tyres ran over a small ridge in the road, occurs every 5-10 seconds or so at irregular intervals. Very strange, any ideas what's causing it?

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  • paul_winspea Mar 22, 2009

    Hi Andy,



    Thanks for the suggestion. I will try this and let you know what the effect is afterwards.



    Regards,



    Paul.

  • paul_winspea Mar 28, 2009

    Hi Andy,



    I did as you suggested and it's no better, if anything slightly worse. I've noticed that the problems is less pronounced when the car is cold, but worsens after the car has been running for half an hour or so. This implies it's related to oil viscosity? Previously the viscous coupling was suspected but I had it checked out by a 4WD transmission specialist and they reckoned the vicous coupling was OK.



    What next?



    Cheers,



    Paul.

  • jerseystew Apr 04, 2009

    I have a koncking noise from the rear diff area (more left hand side) when taking off in first and second gear especially under load ie uphill i have a Audi A4 2001 3.0 sport quattro - Any ideas ??

  • jerseystew Apr 05, 2009

    I seem to have the same problem did you manange to sort yours out ?

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HI,IT SOUNDS TO ME LIKE THE TORSION DIFFERENTIAL ON THE GEARBOX IS CAUSING THIS,PLEASE TRY THIS,DRIVE THE VEHICLE TO A OPEN AREA,YOU MUST PUT IT IN 2ND GEAR AND DRIVE IN A CIRCLE ONE WAY ABOUT 10-15 TIMES,AND THE SAME THING CHANGING DIRECTION,THE REASON I SAY THIS IS TO LOOSEN UP THE TORSION GEARS,PLEASE LET ME KNOW,ANDY.

Posted on Mar 19, 2009

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