Hi, I have a 91/940 with B204E engine, recently self made converted to catalysed by adding a Lambda Sond using pre-wired connectors and replacing the air mass meter and ecu with a B234F one. I have the car from about 3 years, and always misfire. In the past I have tryed to replace the sparkplugs, ht cables, distributor cap and rotary contact, all original Volvo, and ht coil and power stage with second hand ones. recently I have also completely revised engine head and valves, but little misfiring continue. I do not know more where to crash my head :-)
any help is appreciated.
thanks.
Paolo.