The EGR is the Exhaust Gas Recirculating valve - it recycles some of the exhaust gas back through the engine to reduce emissions. Unfortunately, although this may have been an effective pollution reducing measure from new, this seems to cover the inside of the inlet manifold with black goo leading to the air inlet being restricted & black smoke on acceleration. The valve can also get jammed open and/or leak, lots have disabled or removed theirs by various means.
There is a fact sheet here
There is a schematic diagram here courtesy of Lushprojects
If you want further details, here are links to some of the many discussions on the forum.
EGR removal
EGR blanking
EGR system
Disabling egr
If you can't find what you're looking for in all that lot, try using the search function, top right. It can be a bit temperamental, but if you use a multiple word search and use the word "and" between each word, eg front and fan, you should find what you need.
Alternatively, get on the forum & join in
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EGR
Some topics come up again and again. Here you will find short cuts to frequently asked questions, mainly of a technical nature.
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