I have a 94 850 with a 96 engine I installed three weeks ago. After installing, I tried to start but the coil was arcing to itself so no spark. I replaced the coil and it started right up. Ran great for 5 days and then died in our driveway as my son pulled up to park. Cranking but no start. Also, the battery was losing charge over the 5 days. Here is my status:
- when the battery is connected the ecu and the idle motor both heat up and stay that way, even with the key out.
- The fuel pump will not pressurize when the key turns, nor run as I turn the engine over.
- If I remove the ecu, fuel pump will pressurize and idle motor does not heat up, but injectors will not activate (even with the ecu in) I have spark and pressure with ecu out but no injector activity.
- I have replaced the ecu twice and no luck ( as well as the fuel pump relay)
- I tried to pull codes from no.2 socket but get nothing (other sockets are working)
- With the ecu out, I pulled one injector out and let gas splash its way into the inlet - the engine would fire on that one cylinder.

Any ideas would be incredibly appreciated!!!!