Hi Ian, only got general advice...
The fact that it runs sweet for a while and then starts to play up would indicate to me that it is set up properly and the fault is a thermal one that occurs after an initial "warm up" period.
Finding a fault by swapping out components is not a very satisfying way of diagnosing the probelm. If you use this method, swap one item at a time, and if the problem is not rectified, reinstate the origonal item.
As the sub-assemblies of any electronic ignition system tend not to have any "user servicable parts" (unlike points nishers) it should not be too hard to isolate the probelm. You only have a power supply (battery/alternator/wiring etc), magic box, coil(s), LT and HT leads and spark plug(s), so isolating the fault should be straight forward.....as long as the fault is repeatable.
I would start by finding a fool proof way of making the problem repeatable, but keep in the back of my mind that if I spend too long looking for a fault in one part of the system (ie the ignition system), perhaps I should look at something else (eg the fuel system).
Last edited by minetymenace
on Thu Aug 30, 2007 8:05 pm, edited 1 time in total.