I've had this problem for a couple weeks now and I've begun to notice a pattern in how it starts. It seems as though cylinder 1 and 4 (nearest the front of the engine) begin first, after a while it's usually 2 or 3 and 5. And then when I'm having some fun in the backroads I'll get up to 5 cylinders with misfires.

Plugs have been changed and gaped from .018-.024 and it doesn't change. I've got new coilpacks (if you need spare ones, I'm selling my old pair with only 40k miles on them), and I doubt the ICM's.

My new suspicion is the fuel pump not supplying enough pressure (causing the cylinders to run lean), dirty injectors or fuel filter. Would this sound a reasonable cause?

Car is a 2000 with Vast Performance Stage 3, roughly 24 psi.

 

I should mention that one of my 02 sensors is bad (bank 1) and I have some other codes that show up. I'll post the numbers later but something like turbo/supercharger pressure below threshold as well as warm up efficiency below threshold... or something.

 

try checking the ignition control modules, there should be similar resistance between each contact. if you have any dead combinations (12 in all) you may need to replace. i had to replace mine not too long ago and had a hard time finding them. everybody online wants to sell you the a4 style. go with a reliable source like the dealer or shokan for used stuff.

 

well what are your fuel trims?? i think on vagcom its like measuring blocks 32.. maybe 31.. but see what your fuel trims are when its missing.. as well as lambda control.. if your lambda control is way high like .890 volts and your fuel trim is 20% or so then id start with a fuel filter and then suspect pump if that dont fix it...

 

Measuring block results:

#32 (at idle):

.56%
4.68%
.93%
4.68%

#33 (at idle):

- 3-6ish% (minus???)
.75-.05 Volts
25%
.18 Volts

I'm guessing bank 1 sensor is shot, it's also the same trouble code I keep receiving. I was surprised to read it at negative. I also don't think my fuel is bad considering I seem to actually be running quite rich.

Oil is leaking from the passenger side turbo, so I'm guessing this is what affects the sensor and causes more misfires when I'm pinning the throttle. Should I still replace it?