Mick Rae
Active Member
Still here, still chasing intermittent misfire. Between misfires, car (2200sc, that someone in the mists of time added TC instruments to so has rev counter) is running perfectly. I've replaced everything (coil, leads, condenser, points, rotor, cap, leads) one thing at a time, twice over. Tried a different LT wire, no change. Sometimes can go for 10 miles fine, other times, 100 yards before misfiring. Feels like the car just cuts power for a half second. Rev counter not affected. Tried running without rev counter, not that. So tested everything again. Everything checks out - but I am suspicious that the ballast wire feed is a bit on the low side - its feeding 5.5 volts to coil (with ignition on). I thought maybe this should be closer to 9Volts? Could it be possible that it has magically gained additional resistance, and that this is causing an intermittent hiccup?
As you can likely tell, I am clutching at straws here, but really cannot figure out whats going on. Driving me daft as I'd like to get some driving time in, and kind of feeling that I'm never getting to bottom of this (but equally not prepared to give up!).
If anyone can say that this feed to coil from ballast wire is too low, then i figure (with assistance of a friend who actually knows what they are doing) I could try a 12v coil, bypass the ballast wire with a 12v feed and see if that makes a difference?
Apologies in advance if I am simply talking guff here.
thanks
mick
As you can likely tell, I am clutching at straws here, but really cannot figure out whats going on. Driving me daft as I'd like to get some driving time in, and kind of feeling that I'm never getting to bottom of this (but equally not prepared to give up!).
If anyone can say that this feed to coil from ballast wire is too low, then i figure (with assistance of a friend who actually knows what they are doing) I could try a 12v coil, bypass the ballast wire with a 12v feed and see if that makes a difference?
Apologies in advance if I am simply talking guff here.
thanks
mick