ive been having a problem with my crank angle sensor on my 90 civic si. im running a b18b with a pr4 ecu and it is throwing cel 4. i read that when the crank angle sensor goes you gotta change your whole dizzy so i did. got one off a good running 91 ls no codes. swapped it out and it is still throwing. what are teh chances of the ecu actually throwing the code and having my car run in a limp mode. my car idles at 450-500 cold and then like 600-650 hot and runs really rich. if you have any idea or suggestions let me know