Several months back purchased a 90 convertible with a j spec turbo rotary. Ran awsome till motor blew. Upon tearing it apart i noticed the knock sensor was on the motor but wasnt plugged in to anything, i couldnt even find a plug that matches it on the wire harness. Could i have the wrong harness for that motor everything else matches.

 

It's possible that the person who did the swap kept the stock NA ECU and harness, in which case it will not have a knock sensor plug.

 

its quite possible was the convertible models only avaliable in non turbos. I also noticed the engine wire harness had the plugs for air bags on it(those blue and orange plugs) now didnt just the convertibles come with air bags, The computer has #n333 on it

 

All verts were non turbo.

 

^ No there not

 

all USDM verts were non turbo.
so there.

We'll need more detail to help you out - you haven't even really asked a question.
I believe that the N333 ECU is capable of running both turbo and non-turbo engines but I'm going to defer to an expert - my turbo convertable doesn't run!

 

Negative. N338 is capable of runing a 13bt properly.

 

True, but the harness would still be missing a plug for the Knock Sensor since it's used to run one of the many vacuum controls.