I have a 1987 325is. It will fire for a second then die, a bunch if smoke comes out exhaust pipe. I test ohms for the cps and it was 560. Then i read to test between pins 47 and 48 on ecu harness and there is nothing, so i checked for continuity for the wires individually and there was but no ohms between pin 47 and 48 even though cps showed 560. Any ideas?