Surging/Throttle Issues in chip mode. Have Vag codes. Need HELP!

[gordongekkos4]

My '01 6-spd S4 has been experiencing some throttle issues. It seem to be missing smoothness in throttle transitions (throttle cut/surging if you like). It seems to appear intermittently only when in chipped mode (APR 93 setting-1 bar boost). Especially when on the track. Usually after the car has been pushing hard for at least 10 minutes it starts. Most noticeable as I come out of WOT slightly...it will begin to feel like car is bucking/sputtering/surging. If I put the car back in stock ECU setting, the issue disappears. New TBB and 710n's installed within last yr.

I just ran vag-com today after a weekend track event, and here's what came up...mostly misfires in cylinders 1, 2, & 3, and Exhaust Gas Temp errors (bank 1 & 2). What do you guys think? Bad EGT sensor(s)?? What could be causing the misfires...it seems to be on cylinders 1 thru 3??


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17862- EGT sensor 1 (G235): Short to Ground
P1454 - 35-00

16684- Random/Multiple Cylinder Misfire Detected
P0300 -35-00

16685- Cylinder 1: Misfire Detected
P0301 -35-00

16687- Cylinder 3: Misfire Detected
P0303 - 35-00

16686- Cylinder 2 Misfire Detected
P0302 - 35-00

17870- Exhaust GAS Temp Regulation for Bank 2. Implausible Signal
P1462 -35-10 - - - Intermittent

17864 - Exhaust Gas Temp Regulation for Bank 1. Limit Reached
P1456 -35-10 - - - Intermittent

Also saw a code under Address 03: ABS Brakes
18258- Powertrain Data Bus: Missing Message From ECU
P1850- 35-10 - - - Intermittent

And Address 08: Auto HVAC Labels:
Note: Excessive Comm Errors

[S4 in_lowplaces]

Wow another one. Looks like your ICM could be toast, Thats why you have misfires in all 3 cylind.ers on the passenger side. Your EGT is toast also. your power train code has somthing to do with not clearing codes about a reflash or somthing like that. Check audiworld for more info.

I bet the bad EGT sensors is cauing all your misfires on Passenger side. You definatly need a new EGT sensor, replace it, clear codes, and run VAG again. Good luck.

[gordongekkos4]

What's ICM stand for? It would appear that the bank one EGT sensor is toast, and possibly the second one too. Any idea why the throttle issues are only noticeable while in chipped mode?