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Matt
Matt, Mechanical Engineer
Category: Audi
Satisfied Customers: 22154
Experience:  BEng hons Mech engineering, in auto industry 22 years
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I have a 2008 Audi A4 1.9 TDI Auto. with 140000 miles. There

Customer Question

I have a 2008 Audi A4 1.9 TDI Auto. with 140000 miles. There is a rattling noise coming from the car when idling in gear and a vibration when travelling slowly. Can you advise if this is a gearbox or flywheel problem.
Submitted: 1 year ago.
Category: Audi
Expert:  Shantal-Mod replied 1 year ago.
Hello,
I'm Shantal and I'm a moderator for this topic.
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Customer: replied 1 year ago.
I paid €18 for an answer so I expect to get one, not 25% off my next question!!
Expert:  Matt replied 1 year ago.

Hello

sorry about the delay

I'd first try removing the auxiliary drive belt and turning every pulley and ancillary ( power steering pump , alternator etc) by hand. All should turn easily (with the exception of the AC pump) with no grittyness or wobbly pulleys- If you do find a sticky pump / alternator then it should be replaced or repaired

If the engine is stone cold you can briefly run it with no belts to see if the noise changes or has gone away, this will help show if an ancillary is the issue

Examine carefully the condition of the bottom / crank pulley as these are composite construction with a rubber element and its possible this rubber is breaking up and allowing the two metal portions to move.

Another possibility is the variable valve timing system as this does rely on oil pressure to correctly synchronise your vvti pulley on the end of the camshaft. If the valve has become blocked up then its possible the pulley is rattling about and producing the noise.

If all of this is OK then its possible the issue is with the dual mass flywheel on the other end of the engine, these are constructed in the same way I mentioned for the front pulley but are more prone to problems due to greater heat and larger forces.

If your gearstick is rattling this is another pointer to this being the problem.

Expert:  Matt replied 1 year ago.

Hi

do you still need help?

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