So POCUK says to blank off the EGR, and I've heard it here too. Can someone give me the long and short of what EGR does on a diesel (I *know* it "recirculates the exhaust gas" - I want more). What happens to it over the years? Why does it cause smoke? Should one just blank it off, or clean/refurbish it?

School me please. <img src="/forums/images/graemlins/baby.gif" alt="" /> I am but a diesel noob... <img src="/forums/images/graemlins/baby.gif" alt="" />


1991 HZJ77, 1999 KZJ90, 1999 UZJ100, 1992 M101CDN2
https://www.thegearheadproject.com/category/jdm-journeys/