Wanted to get some thoughts on my ignition problem from Saturday night. Took the start in the heat race and it immediately started missing through the RPM range. Went back to the pits and it would start fine and noticed that over 3500 RPM’s the tach needle would go crazy. We were digging into it and the engine cut off. Not idled down and died, but completely cut off. We could not get it restarted. The starter was working, but there was no spark at the plugs. I pulled all plugs and they all looked OK. The header temp was the same on each cylinder when I pulled off, so it was not an issue with just one cylinder. After playing around, it finally fired up and ran. In the staging area it cut out a couple of times, but then would restart. I pulled onto the track with it really stumbling then it completely cut out and would not restart.
The engine ran fine the last time out until I broke the prongs inside of one of the spark plug boots. Both coils were replaced with used one that were on a running motor. Fuel pump was working fine and it did not seem to be a carb problem. I have a black box on it, so if I need to replace the coils can I use red coils? I am going to trace the wiring from the power to the ignition switch all the way through to the plugs and see if I can find the problem. Does anyone have any thoughts on how I can narrow down the search? The coils are the new item in the mix and the most obvious place to look, but as everyone knows who has been around racing, it is rarely the obvious thing that it the problem.
