my isc moter makes noice plus my car is idling high.not only that my service engine soon light is on.
ISC moter on 1994 Cadillac Eldorado
You need to inspect the Idle Speed Motor, the internal position sensor is not detecting that the tip is extended all the way. As for your Check Engine Light, that may be due to the Idle Speed Control motor or some other things as well. Only way to know is to retrieve the code(s).