
Full story. On idle for 5 minutes or so the engine will misfire on one or two cylinders a couple of times then drop the entire north bank very suddenly. Intermittantly it will fire the odd cylinder as there is an odd hot pulse in the exhuast. Blip the throttle a couple of times and it runs on all 6 again.
Ignition is coil on plug and injection is sequential.
FPR reads a constant 3 bar
We have ignition, we tested it with an external plug.
Ignition on number 1 is timed correctly and is 360 degrees from number 4.
Injector timing is correct and matches the PW of other injectors, just phased differently.
Thoughts so far... possible issues with the two TB's being out of balance... however there is a massive balance tube between the two plenums.
Turbo restriction on one bank. But it doesnt explain why we get the intermittant hot pulse.
Cam timing. One of the VVT solinoids being activated... I have no idea if this could cause a bank to misfire. But I'll remove the wiring to the solinoids tomorrow.
FPR issues.... We have crimped each of the two fuel lines to the FPR without correcting the issue. And because they join on a common Y block on the north side of the engine fuel pressure should be common on all parts of the fuel system from the pump to the FPR.
ECU driver issues. We scoped the ecu drives for both injector and ign. Both appeared to be correct when compared to drives for the south bank.
Weird, weird, weird, weird, weird.