LuvnhatemyA6

So every morning when I start from cold the car revs to about 1500rpm for 10s or so. I think this is normal.

The trouble is for the first second or two the engine makes a noise which I can only describe as a screech with a grinding noise, like grrrr screech.

Anyone else had this? What is it?

Thanks

LuvnhatemyA6

PS 76K miles, dealer replaced all the belts, tensioners about 70K miles. Didnt notice this before.

PaulW

If so, it's most likely your transmission hydraulic pump cavitating.

Change the ATF fluid and filter and this should cure your problem.

The filter is dropping too much pressure and when the fluid is cold, you do not have adequate net positive suction head to the pump, so it cavitates.<ul><li><a href="http://www.audipages.com/Tech_Articles/auto_transmission.html">Lots of info here</a></li></ul>

LuvnhatemyA6

Thanks, but no its a manual. Wonder if another pumps cavitating, like power steering?

projekt C5

im experiencing this noise on cold start and i have a tiptronic

has anyone gotten this done at the dealer? how much do they charge to change the ATF and filter ?

PaulW

Nah

PaulW

About $350

paulroad

Th sound of the cylinders running cold waiting for fresh oil to pump up.

Its a common noise on lots of cars. My wife's cab 3.0 has it, my daughters VW 2002 2.0 motor has it. My old 1972 Veg had it... its very common.

What lessens it is good synthetic oil.

If you have a concern... send you oil at thenext change for analysis. It should be fine..

atgmartin4.2

Planning on changing the ATF and filter soon anyway so we'll see if it helps.