Discovery Series II Ignition Leads

so Simon was, like...

The Thor engine uses two double coils - effectively 4 coils firing 1/6, 7/4,

The leads are replaceable, but you need to remove the manifold to do so, I'm afraid. With the manifold off, you can just get at them!! Removing the manifold is pretty easy really, 6 bolts are all that hold it down, just label whatever non-std bits as you go. Tip - use 2 nuts to remove the water pipe mounting stud from the drivers side of the manifold, and replace the stupid hose clips on the throttle body with jubilee type clips on reassembly. " hours will do the whole job, easily. Alternator etc stays put, remove pipe stud, pipes at throttle body and 2 breather pipes, unplug throttle position sensor, idle speed control motor and vacuum valve, reach behind manifold and remove 2 upper coil pack securing bolts (8mm, either side of manifold rear centre bolt), remove 6 manifold bolts (10mm), one at rear, one at front and 4 in centre, remove throttle cables and lift front of manifold and tease out forwards and upwards. DO NOT re-use the gasket (£19 from landrover!!!) on reassembly or you will get inlet leaks. Struggle with HT leads, then reassemble. Badger.

Thank you for all this advice - perhaps I'll try some new plugs first! and then maybe 'av a go Simon