I have a 1994 Honda Accord LX that seems to be having an issue with the Starter Signal circuit. Here are the symptoms:

1. Turn ignition switch to on - Fuel pump runs (since I replaced it) and lights come on as normal
2. Push Clutch in - buzzing sound from Starter Signal Relay (Denso Part # 056700-8570 - next to the Main Relay)
3. Turn key to position III - typically engine cranks but won't start
4. If the steps above are completed without hesitation the car will often start right away
5. Once the car is running if the clutch is depressed (activating the clutch switch and the Starter Signal Relay presumably), the car will stall out and die
6. If the car is running and the Starter Signal Relay is removed you can drive it as normal with no issue

I've replaced the Main Relay, the Fuel Pump and the Starter Signal Relay and still am experiencing the same problem. The CEL comes on and remains illuminated until the car starts - I've jumped the diagnostic connector and it still remains illuminated (until car starts).

The car was driven through some water during flooding here in May which could be a contributing factor. It was running for a month after that so I'm not convinced that contributed.

This one really has me stumped...if anyone has an idea where I might begin checking I'd be grateful!