My engine light came on ,had a m8 plug in with the nissan program showed the egr not working , he reset the egr setting to 100 % to see what happened , i since took the egr off and cleaned it put , back on and cleaned , engine light is gone but egr whirs when i shut the engine off , thinking the egr% was the only thing we changed but have no idea what % to set it back to ? 2011 2.5 turbo d22 4wd