1999Audi

Car is: 99.5 A4 2.8 V6 Quattro

Little info:
*Spark plugs NGK BKR6EIX Iridium IX (almost new june2013 ~9k on it)
*BERU Spark plug wires 47K miles on it (bought in 2009)-looks good no cracks.

*ICM original

*Battery year 2010

*found just a little oil in cyl 5 (cyl: 1,2,3,4,6 - NO OIL)


I tested wires and spark plugs:
*****
spark plugs replaced again(new)
I also switched spark plugs wires between cyl 6 & cyl 4 to check wires = still misfire on cyl4, but next week it moved to cyl 5?
*****

Is it ICM? is it injectors? or something else.


It started around 12jan2014 - and every time I got misfire I VAG it - copy codes and clear them. It happens not everyday - please see below.

===========================
12 jan 2014

Address 01: Engine
Controller: 4D0 907 551 AH
Component: 2.8L V6/5V MOTR AT D04
Coding: 06251
Shop #: WSC 06335

5 Faults Found:
18010 - Power Supply Terminal 30: Voltage too Low
P1602 - 35-10 - - - Intermittent
16684 - Random/Multiple Cylinder Misfire Detected
P0300 - 35-00 - -
16688 - Cylinder 4 Misfire Detected
P0304 - 35-00 - -
16684 - Random/Multiple Cylinder Misfire Detected
P0300 - 35-00 - -
16688 - Cylinder 4 Misfire Detected
P0304 - 35-00 - -
Readiness: 0000 0000

==============================
11 feb 2014

4 Faults Found:
16684 - Random/Multiple Cylinder Misfire Detected
P0300 - 35-00 - -
16688 - Cylinder 4 Misfire Detected
P0304 - 35-00 - -
16686 - Cylinder 2 Misfire Detected
P0302 - 35-00 - -
16690 - Cylinder 6 Misfire Detected
P0306 - 35-00 - -
==============================
11 feb 2014 (30miles later same day)

7 Faults Found:
16684 - Random/Multiple Cylinder Misfire Detected
P0300 - 35-10 - - - Intermittent
16688 - Cylinder 4 Misfire Detected
P0304 - 35-10 - - - Intermittent
16690 - Cylinder 6 Misfire Detected
P0306 - 35-10 - - - Intermittent
16689 - Cylinder 5 Misfire Detected
P0305 - 35-10 - - - Intermittent
16684 - Random/Multiple Cylinder Misfire Detected
P0300 - 35-10 - - - Intermittent
16688 - Cylinder 4 Misfire Detected
P0304 - 35-10 - - - Intermittent
16690 - Cylinder 6 Misfire Detected
P0306 - 35-10 - - - Intermittent

==============================
12 feb 2014
+50miles misfire again


4 Faults Found:
16684 - Random/Multiple Cylinder Misfire Detected
P0300 - 35-10 - - - Intermittent
16689 - Cylinder 5 Misfire Detected
P0305 - 35-10 - - - Intermittent
16684 - Random/Multiple Cylinder Misfire Detected
P0300 - 35-00 - -
16689 - Cylinder 5 Misfire Detected
P0305 - 35-00 - -

===============================
16 feb 2014
+300miles later misfire again

2 Faults Found:
16684 - Random/Multiple Cylinder Misfire Detected
P0300 - 35-10 - - - Intermittent
16688 - Cylinder 4 Misfire Detected
P0304 - 35-10 - - - Intermittent
===============================
22 feb 2014
+400miles later misfire again

*****
spark plugs replaced (new)
spark plugs wires switched between cyl 6 & cyl 4 to check wires = still misfire
*****

5 Faults Found:
16684 - Random/Multiple Cylinder Misfire Detected
P0300 - 35-00 - -
16686 - Cylinder 2 Misfire Detected
P0302 - 35-00 - -
16684 - Random/Multiple Cylinder Misfire Detected
P0300 - 35-10 - - - Intermittent
16690 - Cylinder 6 Misfire Detected
P0306 - 35-10 - - - Intermittent
16690 - Cylinder 6 Misfire Detected
P0306 - 35-00 - -

===============================
26 feb 2014
+350miles later misfire again


2 Faults Found:
16684 - Random/Multiple Cylinder Misfire Detected
P0300 - 35-10 - - - Intermittent
16689 - Cylinder 5 Misfire Detected
P0305 - 35-10 - - - Intermittent