Further thinking reminds me the crank angle sensor is mounted very close to the gearbox,
So I'm left with a couple of possibles,
my original one about crank float,
you pressing the clutch will move the crankshaft with worn thrusts "into" engine so altering the air gap between the CAS and the trigger which could result in poor/lost CAS signal.
My other is a fault in the wiring,
specifically the wiring from/to the clutch switch.
Either way an oscilloscope connected to the crank angle pins on the ECU and the waveform checked as the clutch is applied ought to narrow it down
Posted on Tuesday 8th of September 2015Don't understand this? Ask a question