Hey All,

First time poster, long-time lurker. I have recently gotten everything all dialed in, and I have performed a ton of DIY ECU stuff thanks to this forum, and all of you brilliant contributors. Thank you all for making this stuff possible.

My car is a 2001, B5 S4 stock turbos (unknown mileage), stock intercooler, cone filter, and Ebay DPs. The car was an L Box Auto - I converted it to manual, and flashed the M box ECU file. Everything is coded properly, and setup as a manual car. I have also flashed the Nefmoto community Stage 1 tune to the car. All of that worked brilliantly, the car starts, idles, runs, and drives - well even. Except for WOT - which leads me to this thread.

The linked logs here are from the car using VisualME7Logger with the "typical" logging parameters. Unfortunately since the car is a 6 speed, and I noticed too late, I only have 4 cylinders of knock, and retard, and I did not get a chance to pull another log. If that is mandatory to get a start, I will get a new log tonight.

The car is behaving very poorly under WOT - it starts to build boost, builds a bit of boost, and then starts to break up, before going into full limp mode. This is most egregious in 3-6th gear, but does happen in 1st and 2nd. It does not happen if I limit the boost with my foot, the car will rev to the limiter, and feel good if I dont go for WOT.

The car is NOT known to run. I bought it wrecked (light front end damage that ruined the radiator, and cracked the core support). I manual swapped it, and got it put back together with a donor car. I also never ran the stock BIN file, because I don't have any rear O2s thanks to the DPs.

This is the first time I will be troubleshooting like this, and I am interested in learning as much as I can. I am sort of assuming this must be hardware related at this point, but interested in the thoughts you guys have.

Thanks in advance -


https://docs.google.com/spreadsheets/d/1PALp_o6pGv3CfAE8AOXo5f6JnKRR1NHtiGfY5BuKzUE/edit?usp=sharing

None that are logged by the ECU - I need to add the misfires counter to the log I suppose, right? ECU scan with VAGCOM shows no faults at all.

Thank you for the attention to my thread Nyet - I really appreciate it. I made a better log tonight, and added all the misfires, and the retards for all cylinders. The results seem clear to me, Coilpack 1 looks completely fubar under load (any boost higher than 1920mb). Have a look, and let me know if you see anything different. It does not generally misfire outside of load, but even at light throttle I can see misfiles. I dont understand why the ECU is not setting a misfire code in this case. Really odd to me.

At its worst, it spread to cyl 3 (when Cyl 1 was reporting 19 misfires per cycle) - mabe I need two coilpacks :|

https://docs.google.com/spreadsheets/d/1gByjhRMtTnp3ElRZJqLs0NNo0UhUsD41fiJcYZ1QbnQ/edit?usp=sharing

I had a similar issue with my s4, I  temporarily coded out the EGT sensors and it stopped all the bucking , limp ect with my car .

The community tune deletes the EGT doesnt it? If not, I can go through and update it myself I suppose. Should we crack open the community tune and issue an EGT delete update? I am barely dangerous with the editing (no use at all on tables) but I can follow the directions for EGT delete.

I got the ETSpec "R8/2.0 TFSI" coilpack conversion for the car, and installed it today. Misfires under load are a thing of the past.

These new logs are from a few pulls I made, have a look, and let me know what you think. I see some Knock voltages I dont like (21+) and it is pulling timing variously (as much as -4.5 on Cyl4) once peak boost comes in and stays. The pull is CLEAN from the butt dyno perspective, but interested in anything else hardware wise that I should investigate since the motor is not known good.

Thanks again -

Pull 1: 13,315 - 13,399
Pull 2: 13,395 - 13,382
Pull 3: 13, 927 - 14,120
Pull 4: 14,666 - 14,819 (cyl4 23 knock voltage -4.5 retard)

https://docs.google.com/spreadsheets/d/17EzTH4aiBxdDW8w-6tAN4iE_62-ihtWugvwDZIGqH0I/edit?usp=sharing

Thanks Marty - I dont know how to calculate the AFR from the measurements in the log - I read in one thread that 1 = Stoich (14.7)? So .85 = 12.495? Is that right?

I broke out one of the pulls into a separate tab in the sheet and called it "Focus Pull" - can we work from that one for now? I recognize that there are two banks of AFRDesired & EGT and I am only logging one of them in this file. I am adding the others and will make a new file.

 I assume that you're thinking that bank 2 (cylinder 4) must be lower than .85 so that is why timing is being pulled. Do I have that right? Or am I doing the math wrong already?

Just learning here - appreciate the feedback.

Assuming all of that is true in the new log file - what would cause that? Bad injector in Cyl 4? Is there a regulator for half of the fuel rail?

Thanks,