Sequential Coil Pack Failure On Mk2 V6

[frogeye]

Hi,

 

I know there is some history of early MK2 V6's having a dodgy batch on pencil coil packs so I have been waiting to have some kind of issue in this department but I am a little uncertain that there may be something else going on that underlies this problem.

 

My 2001 V6 had been a little bit juddery in the 1200rpm neck of the woods but nothing much more than that, however on changing my pollen filter (removing the bulkhead extension(?), dropping the wiper mechanism a bit, removing air filter box, MAF and next hose section) when I re-assembled things a day or two later (a possibility that there may have been a bit of rainfall at some point) I managed to slightly bugger up the connector on the MAF - I somehow managed to get the male connectors to slide along the sides of the female connectors rather than into them.

 

Anyway on starting the car it ran like an absolute dog, so I plugged it in the VAG.COM and had a whole host of fault codes:

 

Control Module Part Number: 022 906 032 Q

Component and/or Version: MOTRONIC ME7.1 G 0011

Software Coding: 00033

Work Shop Code: WSC 00000

4 Faults Found:

16684 - Random/Multiple Cylinder Misfire Detected

P0300 - 35-00 - -

16689 - Shareware Version. To Decode all DTCs

P0305 - 35-00 - Please Register/Activate

16497 - Shareware Version. To Decode all DTCs

P0113 - 35-10 - Please Register/Activate - Intermittent

16486 - Mass Air Flow Sensor (G70): Signal too Low

P0102 - 35-00 - -

 

 

On seeing the MAF problem, I went to check the connection and realised that it was not seated properly and reconnected that (a few broken bits of plastic but seemingly nothing worse than that). The engine then ran a bit better, cleared the fault codes and looked at the block reading (under Engine 01) and looked at groups 15 and 16 which indicate the misfire count all pointing the finger at cylinder 5 misfiring, I managed to disconnect the connector from the pencil coil pack on cylinder 5 and there was no change to the engine tone. - This is me counting the cylinders from left to right -

 

I changed all the spark plugs for NGK double platinums (no change), eventually managed to get a pencil coi pack (from Euro Car Parts

[MrT]

You no doubt had the faulty coil packs and it is quite likely by moving them around or just pulling the cables that you disturbed them. Part of the fault is that the units start to break apart where the long thin bit enters the black electonics bit and removing them could easily hasten this happening.

 

I would (and did) replace the whole lot.