[s-cars] Low boost / Heavy load stumble

[Walsh, Edward]

Hi Bjorn,

Sorry, I don't have an A/F gauge....

My car is at the shop today getting a new timing belt, etc.  Maybe I'll have
the guy put a new fuel filter on... Couldn't hurt...

Regards, Ed

-----Original Message-----
From: Bjørn Ødegård [mailto:beernuts at online.no]
Sent: Wednesday, March 19, 2003 4:00 AM
To: Walsh, Edward; s-car-list at audifans.com
Subject: Re: [s-cars] Low boost / Heavy load stumble


The stumbling at heavy load/high boost _might_ be a fuel issue, could
you check the a/f mixture somehow right before and during the miss?
(Fuel starvation might also result in detonation, and therefore retarded
ignition. Any codes thrown?)
The boost fluctuation is also strange, but could be something related to
the same problem.

Bjorn  :o)
'92 S4 (Parked today, drive wifes black Cabrio instead!  :o))

----- Original Message -----
From: "Walsh, Edward" <edward.walsh at agedwards.com>
To: <s-car-list at audifans.com>
Sent: Tuesday, March 18, 2003 9:59 PM
Subject: [s-cars] Low boost / Heavy load stumble


> Seems like there have been a bunch of questions on this subject, so
I'll
> throw my hat in the ring as well.
>
> My MTM 1+ S6 will miss at times (usually under hard boost/heavy load
in
> gears 3/4/5). When the engine does this, the ECU will dial back boost
and
> the car accelerates like a Taurus.... Then all of a sudden, the motor
> "clears its throat" and there is a noticeable jolt of power as boost
> rebounds.  I does sounds and feel as if the plug connectors are not
making
> good contact or as if there has water in the spark plug cavity (There
is
> definitely not a problem with plugs, connectors or water. I had a 92
S4 with
> a broken spark plug connector and it would stumble and miss off and on
> boost, the S6 will only miss with heavy throttle). Gentle acceleration
never
> causes any missing. Peak boost in 2nd gear will sometimes spike to
22psi,
> but boost at highway speeds in 5th gear undulates a bunch (boost will
hit
> 18, then back to 15, then slowly to 20). The car also surges a lot at
lower
> boost levels (bypass OK). Overall Power is also off.
> Plugs and connectors are new (plugs nice and tight). Car just passed
> emissions and (I kid you not) pulled down a Zero PPM in every
category. Car
> has no codes. I am thinking weak MAF (I use stock paper filter) or
Coils or
> some other ignition related failure.... Any ideas where I can
look/test?
> Thank you, Ed
>
>
>
>
>
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