Original post by: Jcrocker21 ,
I have a ISM in a IH8600. I did follow the previous instructions and unhooked my egr while eng cold and key on not running. Truck now runs great, engine light don't bother me much either. Was wondering about if I welded valve shut and just unhooked valve control rod and plugged it back in wil engine light stay off and it think it's opening and closing valve or does it read the actual position of the valve or just motor moving it??