I have heard,and please,I put the emphasis on "heard",that when you blank the EGR valve,you stop large quantities of soot entering the manifold.OK,combine this soot with oil/vapour from the crankcase re-breather and you get the sticky,tarry substance that clogs the valve/manifold up.(now here's the theory).
If you eliminate a large quantity of the soot by blanking,the better quality of air entering the inlet manifold helps to "clean"the pipes and manifold of carbon deposits over a period of time.Like I said,it was only ever expressed as a theory,and like you,I would be interested in any impressions people might have on this when you combine it with using a tuning box as my son has been using "The Italian box" for a couple of months now with very positive results on his 120.
FELIXX.
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