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940 lambda and catalyst replacement 900 1991

That's very helpful Spook, I'll check that out. Have run a number of checks today and interrogated the on-board OBD several times - each readout indicates that it is a lack of control over the air/fuel mixture causing the problems. Haven't yet checked the ECU temperature sender yet of course, but I guess that would show up as a readout on the OBD - code 1-2-3?
all the best, and thanks again

owenF






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