Hi there
I have a 1988 Mini Jet Black, 998cc Carb model with Electronic Ignition.
There is a problem with cylinder 3 on my Mini.
The problem began 3 weeks ago when I went out on a drive in the Mini and it suddenly started running rough and losing power which was a result of both cylinders 3 and 4 misfiring. I limped the Mini back home and me and a friend later confirmed that my distributor cap and rotor arm needed replacing. So we replaced the cap and rotor arm and that managed to fix cylinder 4, however, cylinder 3 still seems to be misfiring.
We confirmed cylinder 3 was misfiring since when I briefly took off the HT lead on it when the engine was running, it made no difference in behaviour.
Later, we changed the HT leads (Which we knew were working) which made no difference; Then we checked for sparks in cylinders 2 and 3 and both of them were sparking. One thing we did notice was that despite the sparks, cylinder 3's spark plug in particular had been fouled quite a bit.
I have new spark plugs on the way but I am thinking that the problem may be something other than the ignition system.
Any Ideas?