I have been wondering about this for a while, so can someone please enlighten me what this does, and what are the pros and cons of it, and risks if disconnected, if any ?
I have a 2.5 TDi V70 (1997 - Direct Injection) and am always looking for more economy ( or more power ) so if anything useful can be done to this engine I would be especially interested.
Thanks,
Nick
It returns exhaust gas to the air intake when the engine is running at a load slightly above idle. It is supposed to cool the combustion and therefore lower NOX emissions. I'm also wondering about whether it is useful, as i get about 15% more economy (and a bit more power) with it disconnected at the moment. When it was disconnected when i got the car, it would have been like that for at least 2 years, with no short term damage, i cant say anything about long term damage though.
Hi Josh - thanks for the reply...
Does it open at high vacuum levels do you know, and therefore controlled by a vacuum hose, or is the control a bit more complicated than that ? If so I could try a short term test by removing a vacuum hose.
Thanks,
Nick
In my old 240 it is controlled by vacuum, turns on when the engine is at low load, switches off at about half to full load. In other cars it is computer controlled, to be honest, i have no idea about yours. Try looking for a diaphram near the rear of the engine block, if it is vacuum controlled it will have one of these that will lead you to the exhaust. If you have a hand vacuum pump, connect it to the diaphram and apply vacuum, if the engine battles its probably the EGR control. If it doesnt, its probably computer controlled
OK - thanks for the info - I will take a look
Cheers,
Nick
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