Interested in your latest find myself as an owner in Stockholm has much the same problem but on no.2 (V6) cylinder. As I understand it, there are three connectors on each coil, one a live (+) from the main relay, another a minus (-) and the third is the impulse from the ECM. Hope that’s right ?
I’d begin by removing the connector perhaps on no.3 coil, measuring what you find and compare that to your misfiring no.5.
I believe it’s safe to do this just with ignition on but car not running (?) if you want the car running you’d have to fit everything in place and pierce the insulation with a pin or something.
At the moment I don’t know what reading I should expect to receive at the third cable from the ECM , perhaps someone could enlighten us ?
Regards
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