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Would a bad EGR valve on a 1987 Volvo 240 DL have any effect on passing the NOx for emissions?

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2004-11-16 12:25:55
2004-11-16 12:25:55

Yes, if the valve is bad. With the car idling, move the EGR valve diaphragm with your fingers. The engine should quit or want to quit. If it doesn't do this, it could be plugged up. Remove the EGR valve and clean any carbon deposits in the valve and also do the same on the engine side where the EGR valve is connected. If the EGR has never been removed before, it will probably have carbon buildup.

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