[Decolliber]

The mechanic who adjusted the CO level on my Carrera today does not have an exhaust gas analyser. He did it using a multimeter attached to the oxygen sensor. I did not see whether he had it on resistance or voltage, but he said he could tell when the mixture was adjusted correctly by when the level fluctuated. Is this an acceptable way to adjust mixture? Can someone tell me what he was doing? This guy does not normally work on Porsches but has an enthusiastic following amongst the local BMW crowd.
In any case, the car idled much better afterwards.
I also put a brand new DME in my 88 Carrera and it runs much better now. Sold the old one, which was from an 84 Carrera (wrong part number for an 88).