On 17/04/2017 18:48, Rod Speed wrote:
Harry Bloomfield wrote
Chris Hogg wrote

Because of the hotter combustion temperatures, diesels emit more NOx,
which seems to be the main point of issue ATM.

Partially solved at low engine speeds by an EGR, problem is that the
EGR's on a diesel need to be regularly cleaned out and no manufacturer
has them on their service list to be cleaned.

Why not ?

The net result is a diesel engine with a choked up intake system.

There must be a reason no manufacturer has them on their service list to
be cleaned if it really was that simple.

Many of them are nigh on impossible to access for cleaning - my previous
car required various items removing, before remving the whole inlet
manifold to access it!

SteveW