I have done some thinking and poking arround on the E30 zone web site. It seems the only transducers that really affect the engine management are the Crank Position Sensor and the AFM. The other various sensors are only use to tweak the fuel mapping depending on temperature etc. It shouldn't be possible for them to cause a missfire. I have changed the CPS. And I don't see how the AFM could cause the pattern of missfire that I have. So on to new ideas...
Next step is a new set of leads - although that seems to be grasping at straws as the existing leads look fine. But I didn't replace them when I built the car so they could be the originals which makes them 25 years old!. They are Beru which is one of the OEM brands. I have decided to DIY them as a new OEM set is ££££ It's cheaper to buy the proper crimping tool and the various bits required.
At this rate I'll have a complete new engine management system.....
Robin
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