I have been working on my car, but it still is not running right. I can get it to start when it is cold, but within 1 minute as it warms up it begins to run rough and starts to backfire. I must constantly keep feathering the accelerator to keep it running and then it will just stop.
I have checked these things: The wiring firing order is correct, and wires are new. The plugs are not fouled, but I replaced all of them anyway and it still did not fix the problem. I found no vacuum leaks, and the compression is good. There is 10V at the coil. The plugs have spark. I put in a different known good MST hotter coil. I rest the pints gap a bit wider. I removed the YF single carb and opened it up and it is clean with no debris or gunk in it. I drained all the gas and put in fresh 93 octane fuel. The vacuum advance can is new and seems to be working. I have not been able to check the timing because the engine will not run long enough for me to be able to do that.
So, I am now wondering if either the fuel pump is bad and not pumping enough gas into the carb or the distributor is not creating a hot enough spark at the plugs. When I checked the plug spark on 3 different plugs, the spark was a “red” color and not the normal “blue” color. I’m wondering if changing to an HEI type distributor would be a better choice. That is my next step. If that fails, I’ll replace the fuel pump.
Any other suggestions? What’s odd is that when it’s cold, it seems to run okay for a short time. As soon as it heats up it runs very rough and then dies.
