Intermittent CEL - 2002 A6q V6

[Mark Rosenkrantz]

Dave, you can always call me at home in Port Crane.  Looks to me like
MAF needs replaced and maybe an intake leak.  Either can cause
misfires, or could be coil pack, etc.

Mark Rosenkrantz

Sent from my Verizon Wireless 4G LTE DROID

ZZracing at aol.com wrote:


I have monitored this list for may years, rarely contributing (you guys
know more that I, and I usually find answers in archives).  Car is 2002 A6q
Avant V6 3.0, 92,000 miles.  I am totally stumped by intermittent drive
problem: car will suddenly feel as if it has not gas (no response to
gas pedal),
then suddenly resume or do heavy acceleration (like too much pedal).  When
this occurs, it will generally show the ESP light first, and, a bit later, the
CEL.  As long as ESP and CEL show, the car will drive well.  Sometimes, the
ESP light will clear, after which the car will throw a hard downshift when
coming to a stop.  If I clear the codes, problem returns within 4 or 5 miles.
I have replaced fuel pump and fuel pressure valve, and a few vacuum lines
which looked a bit dodgy, with no improvement.
VAG Com shows:
16485 - Mass Air Flow Sensor (G70)
             P0101 - 008 - Implausible Signal - MIL ON
16685 - Cylinder 1
             P0301 - 008 - Misfire Detected
16688 - Cylinder 4
             P0304 - 008 - Misfire Detected
16891 - Idle Control System RPM
             P0507 - 001 - Higher than Expected. - Intermittent
16490 - Manifold / Barometric Pressure Sensor (G71) / (F96)
             P0106 - 008 - Implausible Signal
17550 - Load Calculation Cross Check
             P1142 - 002 - Lower Limit Exceeded - Intermittent
Readiness: 0000 1100

Any ideas?  Thanks in advance.

Dave Zube
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