[Dark Skies]

I couldn't afford to have a dealer do the disc. I had to do it myself but it proved remarkbly easy all things considered. The autobox had to be removed but thereafter pulling the bellhousing and torque tube back gave me just enough room to access the flywheel. Job cost something like £350 all in.

Re the sensors. They're both identical and test the same. There are three pins in the conector block, touching the multimeter probes to two of them should give about 900 to 1000 ohms resistance. The other pin is a ground and you simply test that by sticking the sensor on the engine block and touching your multimeter against the pin to check for continuity. If you're getting nothing then they've gone tits up. Bloody expensive too - even pattern ones go for about £90 Unfortunately they're both vital as they chat to the DME about TDC and spark pulses and lots of other stuff that I only tentatively grasp. Chances are that if you have no spark from the coil then the reference sensor is playing up.

I sound like I know more than I do. I found out that lot AFTER I'd replaced the rotor, the distributor, the spark plugs, the (EXPENSIVE BEYOND BELIEF) plug leads, the coil and earth lead.