[Richard L]

I remembered somer years ago one of our IDC based system has the same problem This due to the voltage on the injector (+12) is much lower than our designed window. The low voltage was caused by running a more power fuel pump on the same supply cable, loading up the circuit.

We solved this problem by extending the lower threshold voltage of the detection circuitry. We can try the same thing here. Are you confident doing some soldering?

Before we are do this please measure the voltage of test point 5, test pin 12 and test point 23 for me at (1) pre-crank position and (2)post-crank position.