ok so I just tried moving the coil pack that was giving the most misfires, cylinder 3, and switched it with the one that was not missing much, cylinder 2. Guess what!?!?! Cylinder 3 still misses most. I am so confused! Maybe it's the spark plug fouled up so I am going to swap spark plugs next just to see if that does anything. If so then I will go and buy new ones... again... and see if that fixes my problems. I still can not find any boost leaks so I am guessing the low vac is due to the misfires. I will let you know whats going on as soon as I can get them all swapped around.

Josh

 

Ok, I just tried switching the spark plugs and still no change. I now get misfires on 4 of the 6 cylinders. Here are the codes I just pulled:

VAG-COM Version: Release 409.1-S

Control Module Part Number: 8D0 907 551 J
Component and/or Version: 2.7l V6/5VT G 4000
Software Coding: 06751
Work Shop Code: WSC 06325
5 Faults Found:
16684 - Random/Multiple Cylinder Misfire Detected
P0300 - 35-00 - -
16687 - Cylinder 3 Misfire Detected
P0303 - 35-00 - -
16690 - Cylinder 6 Misfire Detected
P0306 - 35-00 - -
16686 - Cylinder 2 Misfire Detected
P0302 - 35-00 - -
16689 - Cylinder 5 Misfire Detected
P0305 - 35-00 - -


As you can see it's the back 4 cylinders. The front 2 are fine. What else could be causing this? I am so lost right now. I want to burn my car.

Josh

 

Things are getting worse. I know this is a shot in the dark, but try disconnecting the battery for a while. That sometimes affects the ECU differently.

Also, after you clear your codes each time do you do a TBA?

 

Josh are you still injecting w/m or no?

 

Ok, I will try disconnecting it.

No, the W/m is completely disconnected. No power nothing is turned on.

josh

Hey, what is this? It's coming off the coolant expansion tank. Doens't look like it goes anywhere?

 

Just tried it with the new plugs and still am misfiring. No change at all... Not even the slightest. AHHHHHHHHHHHHHHHHHHH

So... I think I am done for tonight.

Any more ideas? I am going to be towing it to a buddies shop tomorrow to see if we can figure it out there.

Josh

 

Your tank is in a different spot than the 1.8T cars. Where does it attach to the coolant tank? Is it an overflow hose so coolant doesn't splash on the ABS controller?

It doesn't look right. I looks like it's been cut on the end.

 

Is the hose #15 in the picture? If so, it's just a drain hose.

 

I just checked the Bentley manual and other causes of misfires can be faulty fuel injectors (unlikely) or lack of fuel. I'm guessing you have fuel in your tank, but have you checked the fuses for the fuel pump and injectors?

 

How did you splice your wire into the MAP sensor? If possible, remove the wire from the controller. Just in case there is something wrong with the controller. Though you would normally get a DTC if things were wacky with the MAP, I once did the diode mod and know that if you mess things up, the car will run like crap. But I have only 1.8Ts; the 2.7T may run like crap but not throw a code if the MAP signal is flaky.