On my way down to London last weekend my Sporty suddenly started running a bit rough. It's not hugely noticable at speed on the motorway except for a slight lack of power. But it shows up more at slower speeds.
I've now investigated the ignition system and found that when I pull the plug leads off in turn, they each make the engine run even worse EXCEPT for the lead on number 3 cylinder.
So I swapped the plug in number 3 into number 1 and still the problem persisted on cylinder 3. So I guess it's not the plug then!
Next I tried the no. 3 lead on plug 4 and again that worked OK.
I've now put no. 3 lead back on no. 3 cylinder and there is a pretty good spark jumping to the block, but when inserted the cylinder still does not fire.
I'm non too familiar with electronic ignition systems, so I'm now stumped for clues.
The spark seems to be getting to number 3 plug, but it's not firing.
The only other thing I've noticed was that plug 3 was a bit oily when I took it out. The others seemed to be ok. Could this be someting as the car uses a lot of oil?
Hopefully someone out there can point me in the right direction.