About 2 months ago I was called out to a Ford Mondeo taxi with what appeared to be a significant misfire. I can't remember which DTC's were present at the time but I replaced the spark plugs followed by the ignition leads then the EDIS coil which fixed the problem.

2 weeks ago the car started misfiring again. There were no DTC's present but looking at OBD Mode 6 data I could see cylinder 2 with a percentage in the misfire column, the other cylinders being 0%. I swapped the spark plug then the fuel injector with cylinder 1 and the misfire remained on cylinder 2.

On Friday the PCM logged P0302, the first time I'd seen a fault code since the misfire returned. I changed the ignition leads again (with a new ones of course) which made no difference then replaced the coil which fixed the misfire.

This morning (Sunday) the car is misfiring again after less then 36 hours. I've just come back from the car and it's logged P0300, P0302 and P0303....random misfire, cylinder 2 misfire and cylinder 3 misfire.

It could well be the new coil is defective but I'm also concious that this could be a problem with the PCM coil driver(s).

I'm going to replace the coil with an OEM Ford one tomorrow but I'm seriously thinking of sending the PCM away for testing.

Any thoughts or suggestions would be much appreciated.