I've been having problems with my EGR valve recently (I think I have anyway!), so today I took it off, gave it a good spray and scrape out, and I've blanked it off with a thin bit of tin. Started it up and it was a bit grumbly at first but then seemed to level out to quite a nice idle. Pulled away slightly differently (I can't work out whether better or worse), and has been ok so far.
What I'm wondering is there any potential negative side effects to having the EGR valve blanked off coz now that it is, I'm quite happy with the way it's running, but if it's gonna do anything I'd rather get it replaced.