I got a B16a Gen. 2 in a 92 Civic CX. Well, for the past months or so it has been blowing black smoke out of the exhaust (in mid to high range rpm) , and getting all over my back bumper. I took it to a local shop for them to see if it is throwing a code, but they can't find where to hook up the device to even get the codes. When I did the engine swap we had to use the stock wiring harness b/c the one it came with did not fit right. Anything can help, thank you.