1997 D-90 Idle Speed
My 97 D-90 Idles at 1,500 to 2,000 RPM. I had a bad O2 sensor and replaced it (by the way, is there any way to reset the check engine light without an OBDII reader?) with no change. I know on previous years there was an idle speed screw you can adjust. Is there anything on the 97s? If so where exactly is the screw, I could not find it. Also, this engine was replace by the previous owner with a 99 Disco 4.0 at 65K (125K on it now). I bought it from a 3rd party and the seller did not know if this problem existed ever since the engine was replaced. I checked for air leaks and found none that were apparent. Anything else I can do?