Originally Posted by xffalcon
\when i got my falcon the egr valve was blocked off with a pice of aluminium beteen the plennum and the valve itself. it is still like this and i was wondering whether i should unblock it or leave it.
what are the benifits of having it operational
leave it like it is - the XF workshop manual will explain what the EGR is for.
the benefit of it working is that the car (may) pass a strict emissions test
Other than the blank off plate, you can achieve the same effect by putting a ball bearing in the vacuum line running to the valve.