thanks for the replies so far guys.
I posted the same question in the 75, 164 and spider section, as they use the same system and hopped someone would reply. I got slapped on the wrist
My apologies to the admin, i didnt know what else to do as there is no section for just ECU/ ML4.1
I have always had problems with the emissions on this car. I have read up on how to set them up correctly and went to put them into practice.
If ECU or AFM is changed then the AFM needs to be calibrated, i guess this was not done by the previous owner as the ECU is not original to my car, as it has a sticker with a different reg on it and the car was de-catted when i bought it.
Calibration is done by disconnecting the lambda sensor and adjusting the idle mixture screw until you get a co amount of "cant remember" before the cat via the 10mm plug in the exhaust. The emissions tester will not fit in there so i just adjusted until co was either at the max allowed of .30%, I still got high co when the lambda was reconnected so i tried again and then adjusted to the lowest the co would go, which was .17% "Ramian i miss typed
". As soon as i connected the new lambda sensor up again, the co shot up to .45%
The readings are correct, i got 20ppm for HC "Ramian 200ppm is the maximum allowed and will get exceeded if idle mixture is played with".
I was thinking the new lambda sensor must be shot, as there is no fluctuation on the scan tools readout and the co shoots up when it is connected.
The max co pass level is .30%
I didn't know the ML4.1 could read MAP manifold absolute pressure and atmospheric pressure, are you 100% sure on this, thanks so far.
Alfa sprinter, there were no fault codes.
It has been suggested that the lambda sensor is not earthing properly as there is no earth lead and newer ones have 4 wires because of this and that i could try earthing the outside of it to the body of the car.
Do new sensors often come broken? I have informed the suppliers and they are willing to replace but i wanted to exhaust (he he pun) all avenues first, as in earthing/ possible ECU problem ect.
Does anyone have the correct expected idle values?
I think that the ignition advance might be the cause as my 16V before this one had also been de-catted and when i fitted the cat and lambda sensor it wouldn't pass emissions, lambda was fluctuating and it too had a high 77 ignition advance and the ECU was temporarily swapped and i think it went down to 30 ish and then passed emissions. This was a while ago and the old grey matter could be mistaken.