Petertil

I had a similar problem on my 260Z and found that there was leakage of the spark voltage from the plug centre electrode across to the screw thread outer case so that even though the timing light showed that there was a spark voltage going through the lead it wasn't getting to the spark plug gap. It was getting shunted to earth before it got to the gap. I tested with a multimeter and found a resistance across the plug when it should have been open circuit. A new set of plugs fixed the problem although I'm sure the old ones can be cleaned and made serviceable again. I think maybe it was caused due to a build up of carbon inside the plug due to it running rich when I was having trouble with the carbys.

I got a set today from Motorama, Browns Plains, Qld. $111.32. Ordered yesterday lunchtime and they were there in the morning today. Again, they tried to tell me there was only one in the box but I assured them that there would be two. Very Good.