My 617 engine, a transplant, in my 1981 300SD idles too fast. Should be
800-900 RPM but seems more like 1,500 (tach not working). Sometimes in neutral or park it will start to run away.Mechanic told me adjusting the idle speed is not a simple matter. You have to remove and replace the injection pump and looking at 4 to 5 hours labor.
You mean there is no simple idle screw adjustment?