HHello, I've been rebuilding my Sierra race car and have got to the point where I will be starting the engine.. it came with a p8 ecu... I have opened it up and it seems it has a few points bridged on it.. I am not expert on this so need to know why this has been done.. I do know that the p8 runs of a Lambda sensor and my loom doesn't seem to have a lambda sensor.. could this be why it is bridged?? Also the baby board seems to be missing??? And it doesn't have the holes to mount it either??

 

Baby boards are additions I believe.

 

Hard to tell what was done or why, looks like some mod the knock pin and ECU relay trigger, if you can denote the pins it may help.

Baby Board was not fitted in the P8 as standard and really shouldn't use one as they can damage the adaptive memory

 

Pin 10 wire (blue) is probably a repair of a damaged track on the print.
If that's the case the diode it connects to should also have been replaced.
Common problem when the car is started without a proper ground to the engine.