Misfire/stall Fiat 124 Spider
Shortly after gassing up and cruising at about 70 mph, my Fiat 124 Spider misfired, backfired and stalled out. When that has happened in the past it has been because of an over-heated ignition coil. I carry an extra and when I have replaced it, the car starts immediately and runs well. This time, not. Had to get a tow home. The car will start and run for a few moments, misfire, with the tach jumping, and stall and refuse to start for some time. The battery charge indicator does not come on when the key is on, however, the battery seems to be holding a good charge. I've used dry-gas just to make sure the recent fill-up wasn't at fault and have put in a new coil. Any suggested diagnoses would be appreciated.
Are you still running points and condenser or solid state ignition?
converted to electronic ignition years ago.
Ok then look for the spark control module and replace it, next check the voltage going to your coil it should be around 9 volts at the positive connector at the coil, if battery voltage then that is why your coil is running hot, install a ballast resistor in the coil power wire to drop the voltage to the 9 volts, a parts store should stock one. The charge light has too operate for the charging system to operate properly, it might be ok now but soon it won't. HTH
My 1980 Spider started running lousy one night and only ran at high RPMs. Fortunately I was a few blocks from home and was able to park it in my driveway. To make a long story short, I replaced several components but found that the car ran fine for @ five minutes when cold and then developed the same symptoms. I discovered that the multi-strand wire from the temperature sending unit (front of engine near top of radiator) only had a few unbroken strands. I repaired the wire connection and the car now runs fine. The car was apparently running extremely rich once the engine warmed up. This may not be your problem but it is easy to visually check for this condition.