[Biturbos4] Check engine light

[David Bray]

Gentlemen,

I have the same car ('01 S4, 6 spd, Oct '00 build date) with less than 60k
miles (about 95,000 km) and a similar problem.  I never accelerate hard when
the car is cold, but 3 times (twice last winter and once this winter), when
I accelerated hard with the engine and oil up to normal operating
temperature, but the ambient temperature below freezing (say, -10 degC), CEL
would occur (resets after 3 starts).  Other than this, I haven't noticed any
loss of power or smoothness, hard starting, etc.

When I had it checked (I don't have VAG com), I was told it was an 'engine
misfire'.

Would it be useful to run some injector cleaner through it?  One mechanic
suggested changing fuel filter and/or plugs.

Thanks for any further thoughts.

Cheers,
David



> -----Original Message-----
> From: biturbos4-bounces at www.audifans.com 
> [mailto:biturbos4-bounces at www.audifans.com] On Behalf Of Rhett Ennis
> Sent: December 6, 2007 11:48 AM
> To: Mark R; ama-list at mltp.com
> Cc: biturbos4 at www.audifans.com
> Subject: Re: [Biturbos4] Check engine light
> 
> 
> Agreed.  And it's definitely time to get that timing belt replaced.  
> 
> ________________________________
> 
> From: biturbos4-bounces at www.audifans.com on behalf of Mark R
> Sent: Thu 12/6/2007 8:44 AM
> To: ama-list at mltp.com
> Cc: biturbos4 at www.audifans.com
> Subject: Re: [Biturbos4] Check engine light
> 
> 
> 
> No, that's no indication of an impending timing belt problem, 
> but you're at
> the mileage for one as preventative maintenance.
> 
> Accelerating quickly when cold is not advised until the 
> engine is fully
> warmed up for any car, especially with the thermal stresses 
> of the turbos.
> 
> Misfires when cold can be a variety of things, and would need further
> diagnosis.  Could be a sticking valve, air leak, failing MAF, knock
> sensor, etc.  Are there any other transient codes which would 
> help narrow
> down the focus?  Over time, is the misfire code for the same 
> cylinder?  Does
> it matter if it's wet or dry out?
> 
> There's no such thing as a "piston misfire."  By definition 
> the piston can't
> misfire!  The piston is mechanical, not electrical.  However, 
> the code does
> say (somewhat cryptically) "cylinder misfire."  Perhaps you recalled
> incorrectly?  For what it's worth, these codes are fairly common as
> transient codes... but if the check engine light goes on, there is a
> definite problem.
> 
> Good luck,
> Mark Rosenkrantz
> Binghamton, NY (and also enjoying the snow/cold)
> 
> On Dec 6, 2007 10:59 AM, Aurangzeb M. Agha <ama-list at mltp.com> wrote:
> 
> > I've noticed over the last few months that when I start 
> driving the car
> > from a cold start and accelerate quickly, my check engine 
> light turns on.
> > I've checked with a mechanic who ran the VAG and said this 
> was a piston
> > mis-fire.  After four or five restarts, the light seems to go away.
> >
> > Now that it's gotten colder hear in the North East, I seem 
> to see this
> > problem more and more.
> >
> > The car is a '01 S4, and has 89K miles on it.  Could this 
> be a sign of the
> > timing belt starting to go?
> >
> > Thanks in advance.
> >
> >
> > Aurangzeb
> >
> > --
> > '01 Silver S4
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> >
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