my b18a1,wich is in a 91civic dx,dpfi- mpfi, well it is cutting out at 3500?sounds like the rev limiter. my ecu is putting out 4 short blinks, wich the chilton says it is the crankshaft pos. sensor?what- where and how do i know or check? my cooling fan wont come on . checked all fuses,it is plugged in????? my temp gauge will read all the way hot but is not over heating?????????? please someone help! I'M LOST?