EGR or not
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I am not sure about Volvos in general on this, but I know that many cars rely on the EGR system to keep exhaust valve temperatures down and prevent them from getting burned. I know that a number of vehicles are susceptible to valves burning if the EGR system isn't working, and that some of those cars rely partly on the backpressure from the catalytic converter to help open the EGR valve. I had a friend with an old POS Grand Am that I fixed burned valves on 3 times- all 3 times, we had the head sent to a machine shop to be redone (this was YEARS ago!) before I found out that the catalytic converter had been "cleaned," I.E. emptied out, and that that was preventing the EGR from opening. Once we put a cat on again, he stopped having trouble with it burning valves. So...at least on some cars, the EGR system is VERY important, and definitely doesn't hurt anything.
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