JokerUK said:

Thanks Jim, I purchased a smoke tester last week and of course the cone was too small for the maf inlet which resulted in an unsatisfactory bodge with a ploy bag and gaffa tape - but did get me as far as leaky throttle body seals - which are hopefully fixed. Looking for a better smoke cone adapter to continue the inlet testing.

I actually purchased a pair of coil packs so I could do some swapping with known good parts - but yielded nothing.

compression is good and consistent across all 8 cylinders

I will look at the wiring - that’s a helpful steer.

As background the Code only gets thrown under load

I am concerened though , hence the original post, that the ECU mapping is non-standard and would really like to put a standard map on as I can’t be sure what could have been mapped out.

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JimS said:

A standard MAP would be good IMO, especially with the recent move to leaner running E10 fuel (presuming it was remapped with the good stuff)
Misfire under load sounds like a weak coilpack but you've eliminated that, weird. Maybe it is the wiring/connectors, they're old AMP/TE Junior-Timer connectors that have crimps that have a tendency to get a bit loose over time

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Nodge68 said:

I'm guessing the map isn't standard, as you've not mention low cat performance, which is something the factory map will definitely show, it'll put the MIL on too, if the cats aren't working correctly.

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