Looking for some insight on this problem as I've been working through it since March. Am running Unitronic Stage 2+ RFD file on my BPY FSI with a ported/polished/ceramic coated K04. No changes to either wheel or wastegate. Since the K04 was installed, I have experience really bad misfires from ~5500RPMs and up when heavy on the throttle. It's so bad the car won't reach redline if you keep on the gas, but it pulls strong until it hits the "wall." Only codes that get thrown are the random/multiple misfires and then individual codes for cylinders 1 and 4. Also, whenever I crank the car up in the morning I can expect anywhere between 7-14 misfires across all cylinders. The car will pitter/putter and eventually crank up. It seems to take longer to get running on colder days.
I have done the following in an attempt to fix this:
I have done the following in an attempt to fix this:
- Replaced and later rotated spark plugs and coil packs. Used R8 coils and the plugs recommended by Unitronic. Plugs gapped to .028. Misfires did not move when rotating
- Rotated new S3 injectors. Misfires did not move
- Ran compression test cold/hot. Everything looks good
- New fuel filter. No change
- Installed 145 bar FPRV. No change
- Tested brand new APR HPFP. No change
- Installed Unitronic intake/DV relocation kit. This helped quite a bit as I was running a BSH TruSeal from way back in the day
- Installed latest revision rail sensor (06J906051D) and confirmed the sensor on the HPFP is the latest revision
- Replaced LPFP and control module. Am running LPFP with part #1K0919051DB and controller with part #1K0906093J. This helped a lot, but the misfires are still present
- Unitronic intake/DV relocation
- Rev. G DV with GFB DV+ internals
- S3 injectors
- APR IC
- BSH PCV block off
- APR HPFP
- Latest revision MKV GTI LPFP and control module
- 145 bar FPRV