Ive got a 2.0 duratorq focus and fitted my solid egr blanking plate 2 weeks ago the transformation is amazing with better mpg smoother running and loads more responsive but it put the eml on saying something along the lines of egr high pressure ?. Someone says the euro 4 engine needs a hole in the plate so I started with a 4mm hole which still put the light back on ive went up 2mm at a time and tonight drilled it to 10mm which ive seen for sale on ebay, Ive knocked the light out but wont find out till tomorrow if its going to stay out as soon as u put a hole in the plate its nowhere near as good as a solid blank but the holes still smaller so there must be a little benefit lol.
It is reconed that a holed plate is a waste of time, and defeats the point of the blanking plate
with the holed plate you will still get hesitation, lag and an increase of smoke (potentially contaminating the turbo VNT mech, causing earliy(er) turbo failure, more smoke out of the exhaust or contamination of the DMF (if fitted)) and the inlet (manifold etc) will still get contaminated with carbon from the EGR
My best advice is to fit a solid blate that works properly to block the exhaust gases, and ignore the engine light or reset it with a code reader now and again (some people do this once a week)
or 2nd best, forget about fitting a plate,
Which is more important - a little light on on your dash or all the above advantages of the solid EGR blanking plate?
Another advantage of a solid plate is if the EGR valve fails / leaks the engine will still run ok (because it disables the EGR)- with a holed plate/ no plate it wont
it would be good to see back-to-back objective tests between no plate/ holed plate/ solid plate (eg on a dyno)
a non - blanked EGR causes long-term problems for the engine, not a solid plate - it saves the engine