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Re: ERG valve
Fairly common I think. Mine was plugged solid also. I now make a point of checking/cleaning it every time I change the oil. The book says you can check it by running the engine up to normal operating temperature. Then place a finger on the EGR valve diaphragm and accelerate the engine - you should feel the diaphragm moving.
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1993 Geo Metro - 1.0, MT, A/C - 343K Miles
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