I had thought about a vapour lock. But I recently put a pressure gauge in the hp fuel line which indicates all is well on that side.
Last weekend I replaced the ECU. Interesting result. The missfire is worse! All I can think off is that the missfire is being caused by interference and the new ECU is more suseptable. Hmm....
I have reinstated the BMW check engine light. It's flashing madly indicating a problem. You are supposed to be able to read the fault codes using it and something called the stomp test - but I havent been able to make thst work.
I am going to try running without the alternator tomorrow. It seems I just need to remove the charging indicator lamp which provides the excitation current and the alternator ceases to err alternate....
Robin
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