I have the following problem with this Audi a4 2.6 v6.
The car is running bad and misfiring on bank 1, measuring lambda at this bank showing it runs lean until it goes into limp mode and then it starts running a little bit beter, bank 2 runs good lambda is switching good.
They owner pulled the cylinder heads because the valves where leaking, also swopped the injectors from bank 1 to 2 but the problem stays at bank 1.
My thought is mechanical. I made a fls intake cranking and also wps cyl 1 and cyl 4. cyl 1 is bank1 and cyl 4 is bank 2. I find the pressure rissing before the intake valve opens at wps 1 a little bit strange.
Also a capture with the mixmaster during running.
Any Thoughts?
Solved the problem, because the problem started after the head was off, I focused to much on the timing issue. After checking the timing mechanical and this was good I looked good at it again, when the lambda was active, bank 1 showed in the live data 0,7 lambda so this is rich but measuring at the lambda was lean, voltage was low until car got into limp. This is strange so decided to disconnect the lambda to see what happened and the data again showed 0,7, after checking the wiring it must be the ecu. Found a other ecu and the car is running good again.