Well we finally got there on this one.
I replaced the AMM with one from another car and it ran much better, scoped it up and the only difference I could see was at idle the base voltage is 1.50v on faulty AMM and 1.25v on trial unit, 500 miles over Easter later and no MIL on, fuel trims checked s/t 100% l/t 105% looked pretty good to me and we managed to source just the AMM and not the whole throttle body at over £500.
Consider this put to bed and thanks for all the responses.
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Nissan Micra K11 1.0 2002 - MIL on, weak mixture? (waveforms) - Fixed # - Malcolm Tripp March 16, 2011, 9:07 pm
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