So I have an 86 z31 na2t with a turbo 84 ecu and injectors but since I've completed the conversion my efi fusible link burnt out and when I soldered the wire It ended up shorting and causing a lot of my harness to melt. Since then I have been able to start the car but once warmed up and shut off it won't start any ideas what this could be?

 

Engine needs 3 things to start:
-Fuel
-Spark
-Compression

Do you have fuel pressure when it won't start? Do you have spark when it won't start? You probably toasted your ecu.

 

Yes it was getting all 3. So I went ahead and replaced the entire E.F.I harness. Since all my problems started after my harness had gotten fried. It actually fixed the hot starting problem but I just recently been driving it and it just started blowing out a lot of smoke. This worried me so I turned right back around to take my car back home to park it. I checked it and I notice my emergency relief valve was spitting out oil. Idk if this is normal. Along with that valve, the throttle body also had a good little puddle of oil inside of it, even my downpipe had some coming out of it. On top of all those things I decided I'd change the spark plugs to see what they could tell me and they were all black. Does this mean oil is getting into or through the combustion chamber? Any help would be much appreciated.