On my 90, I have a P0327 code that just won’t go away. I’ve replaced the knock sensor twice thinking the new one i bought was faulty but I don’t think I got 2 faulty ones in a row. I’ve seen a lot of things saying it could be the ECU/VCM but that’s kind of last option because it’s kind of expensive. Anybody else dealt with this code before?

 

I don't have a '90 wiring diagrams but I found a '91 which may be the same. Does the knock sensor have a single Dk Blu wire going to it?

George