[s-cars] Stumbling under acceleration.....probable boost leak? Or...

Ben Swann benswann at verizon.net
Wed Nov 25 14:56:51 PST 2009

Seems to be the bane of late - please let us knjow what you nail down as a specific

Agree with the coil pack probablility, but look for boost leak too!


{Date: Tue, 24 Nov 2009 21:42:24 -0700
From: "Calvin Craig" <calvinlc at earthlink.net>
Subject: Re: [s-cars] Stumbling under acceleration.....probable boost
To: "Jim Fleischer" <jim at almgt.com>,<s-car-list at audifans.com>


My top contender would be a coil pack.


-----Original Message-----
[mailto:s-car-list-bounces at audifans.com]On Behalf Of Jim Fleischer
Sent: Monday, November 23, 2009 6:37 PM
To: s-car-list at audifans.com
Subject: [s-cars] Stumbling under acceleration.....probable boost leak?

Hey guys,

Just returned from a 900 mile mostly highway trip from Texas to Colorado....Noticed
shortly after heading out that there was some significant, albeit inconsistent stumbling
upon acceleration.  Could half-throttle it and keep it from happening in the lower
gears, but fourth and fifth suffered under harder acceleration at lower revs.  Checked
all the obvious places for a tear, and tightened up all hose clamps I could get to
easlily.....no difference.  Car still pulls pretty well at upper RPMs, but not smoothly
by any means.

Was able to replicate this with more regularity as the trip went on, and seems to have
gotten worse as the altitude increased.  Was downright difficult at 10,200ft in
Leadville, CO.  Disconnected battery overnight to reset ecu, etc. and found no
difference today.

My thought is a boost leak, but cannot see/find a tear, and revving the motor in place
does not put enough load on to make anything readily apparent.  Before I start tearing
off hoses, etc. anything else I could be missing?

Car is a 95 s6 avant and just turned 80K miles this trip.  Hoses, POS, etc.
all original.  Replaced spark plugs and wires @ 60K.  Checked spark plug torque, all

Any and all help appreciated!  Do not want to take this in to anyone if I can help it.

Best regards,

Jim Fleischer
'95 s6 avant
'83 ur]

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