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Hi Rob def two wire yes to correct to pins even had loom checked out when running sounds great.

Well I'm at a bit of a loss then, all I can suggest is the crank sensor may be on the way out or a wiring fault of some sort. Can you post a picture of the crank sensor and trigger, I imagine it's at the front of the engine, buried in the bulkhead.

I will ask again have you got the ECU case grounded, without this pin grounded all sorts of problems can occur.

Tony.

I'm with Robs suggestion of trying a replacement crank sensor. I have seen the signal degrade on a Busa sensor (But it's in a miserable location and is probably the wires rather than the sensor itself). If it's a relativeloy inexpensive model of sensor on your engine or you have one lying around, it's worth a try.

Hi Tony yes the case is grounded

Its a new sensor but this still could be faulty, the wiring has been checked by others and all is meant to be correct , will order a new sensor.

This 12volt starting

This 24 volt cranking

At the slower cranking speed it does seem to be missing a tooth which is confusing it.

0.8mm is a small gap, but can you move it closer as a test ? It's definitely central over the wheel ?

Alex would be able to decode his own scope info better to diagnose, I always prefer to see a proper scope trace as it just shows a better picture.

I've been chatting on email already. I'm stumped.
I've never seen a trace like that where the missing tooth gap is missing.

And why did the P8 work with the same wiring?