Hey everyone my '92 civic si is having problems starting and when it does start it it blowing black smoke. From my understanding this sounds like a bad air fuel mixutre but my car is fuel injected and I would like to know what can cause this. Also my check engine light is on and when I jump the diagnostic port it reads a bad ECT sensor. I know a bad ECT can cause this but would it be this severe and will a trip to autozone to buy the new sensor fix my problem right away? How much damage could this have done to the rest of the engine?

 

Fix code 6 and then go from there. Have you checked the ECT sensor connector and wires? Have you measured the sensor's resistance? It should be 200-400 Ohms with the engine fully warmed up.