Hello

before i begin to write you must know that my englisch is not so fine .
I must think that the engine (all zylinder) are working ??!
The first to checked part ist the Air/Fuel sensor (Lambda) , I think that is the favourite problem . To test this one you must put out the connection wires from the sensor . The place is under the left ignition on the zylinderhead and the gearbox .
One wire has the colour in black and is lonly connector in the place .
The other one will be in white and it has two cable-connector in the same place .
The engine must be run ok or better then before...
The other one is the thempprobe ... i would take an other one (new) also you will think he`s ok . His colour is also white !

Check tis out and take the info in this Thread .

see you


PS: if you have a black or black/blue exaust gas the engine had too much petrol

V8 erbarme Dich !