[Biturbos4] Check engine light

[Wilson Northrup]

I had a situation where i was getting some intermittent but recurring 
misfire codes. I did run a  bottle of Redline S1 ( i don't know that this 
is superior to anyone else's selection of cleaner) which really did seem 
to help.

i now keep the redline S1 bottles on hand, and put *some* of the bottle in 
from time to time.  each bottle is supposed to treat about 100 gallons.

FWIW, i'm not a mechanic, but try to do as much as possible on my own.I do 
use vag-com on a regular basis to check the car and change the plugs about 
every 25K miles with the audi stock selection (NGK).

This may work for your misfire issue, it may not.

On Thu, 6 Dec 2007, David Bray wrote:

> 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
>>> _______________________________________________
>>> Biturbos4 mailing list
>>> Biturbos4 at www.audifans.com
>>> http://www.audifans.com/mailman/listinfo/biturbos4
>>>
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