Hi guys,

My friend swapped AXZ 2.3 VR5 engine in Audi 80b4 quattro.
All is working fine, car working, only one think is irritating, when speed signal VSS is connectin to ECU then car jerking about 2500-2800RPM on 2 and 3 gear.
When VSS is no connected then all is fine.
Friend planned to add cruise controll thats why VSS, clustch switch and brake pedal switch is connected to ECU.
Car dosen't have EVAP, SAI and rear o2 so I turn off it in ECU.

Any sugestions what can I do with ECU to fix it? Is some flow correction map via VSS? I search it in funktionschramen but I can't find it.
Gear detection map is not correct?

I don't have any ideas why that jerking.

Sorry for my English it's not my native language.

You have right, I will try to do logs to analyze.
Additionally when I change AIMVM from 4 to 6 then problem will not occure, but ECU see wrong speed of course.
Mabye ARMD algorytm will someting wrong?