Audi Won't Fix A4 Engine Noise

[Stephen Kormilo]

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At 18:34 30/10/01 -0500, DF wrote:

In a message dated 10/30/01 12:05:23 PM Eastern Standard Time,
stephen at kormilo.ca writes:


 >> been making a loud 'rattling' or 'knocking' sound for
 >>a second or two when starting the engine 'cold'

 >
 >Although we don't yet know what that noise is,,,,,,,, every and I mean
every 30 valve V6 we have had has made that noise.

The mechanic at the local dealership and even the Regional Rep didn't
indicate this.  My web searches and prior emails resulted in only 3 or
possibly 4 engines exhibiting what I believe to be a similar cold starting
noise.

 >It seemed at first (after changing our underwear) that it was a rod knock.

It sure sounds like that to me too. Not 'pretty'.

 >but it wasn't. I am close to being convinced it is in fact lifter noise
(but it sounds like lower end ) because audis always made lifter noise, and
it goes away >once there is oil pressure.

I don't think that it is lifter noise because of the repetition rate of the
noises, once every 30ms.  As I mentioned in my post, this corresponds to
one noise 'pulse' every crank revolution @ 2000rpm.  How many lifters would
be 'activated' every revolution?  Perhaps you could confirm that the engine
speed briefly reaches ~2000rpm right after 'catching', before settling back
to ~1200rpm.  The tach easily reaches ~1500rpm, but I know it 'lags' the
actual engine speed.

 > another possibilty is the oil pump building pressure. but I have to say
that's a guess.

How is the oil pump driven?

 > so far, we've had no lower or upper end problems with these 30 valve
's  that would come close to warranting a tear down. we have changed
several > water pumps that were noisey, but that noise doesn't go away.

I would expect something better for a car at this price point.  Smacks of
poor design and/or testing.

 > .02

That's almost a $ Canadian ;-)


Stephen Kormilo                            Silver '98.5 Audi A4 2.8QM
Instructor, Electronics Technology
Red River College
Winnipeg, MB
CANADA

email: skormilo at rrc.mb.ca
OR
           stephen at kormilo.ca


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