... I reckon. Have now spent ages messing around with new injector & coil pack connectors for cylinders one and six, end result is I now have 5 working cylinders rather than the 4 when I started. However, no matter what I do I can't get number 6 injector to operate, so I reckon it's had it. Bummer - that means plenum off etc etc etc

have you checked the resistance across the terminals of the suspected injector ?

Best is to do this at the ECU, so you'll test main wiring harness at the same time.

 

other method is to use a long screwdriver as a stetoscope and listen if the injector "ticks" at all or sounds different from the other (working) injectors.

 

Are you sure #6 gets a spark ?

 

I've had a similar issue some time ago and was also suspecting an injector as well, but found out after many many hours the problem was caused by one of the main PTU connectors. Had to completely cut it off and solder a "new" connector to the harness.

No had done all that, spark was fine, injector impedance was OK, but no clicky-clicky from the injector, so plenum is now off and the injector rails will be off to the injector doctor I think ...