so the answer to my question is,do i need to blank it off or can revo do it ????
Tuners usually (most of them) turn the duty cycle right down as a matter of course on these diesels, so yes, revo can do that. The ECU doesn't exactly look for the EGR, but monitors the airflow. If the EGR is removed, the airflow changes.
Revo can turn the duty cycle right down, but to totally stop it, either remove it or blank it off. Personally I wouldn't, most people on here focus on the cons and forget the pros of the EGR, but thats just my humble opinion.
so really clean it out or put a new one on would be your advice
It's a very debateable topic regarding the EGR. It plays a big part in the engine running correctly especially in winter and cold climates, and not only there for emissions, but as preveviously stated, there are pros and cons, and many would argue more cons. Do what you think is best.