Thread: 1994 E420 Code4 and Code19
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  #14  
Old 09-22-2008, 11:02 AM
Arthur Dalton Arthur Dalton is offline
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Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,804
They get dirty and hang up..I squirt WD40 into the downstream line and let the vac suck it thru the valve. That clears them up. Same thing happens on the Purge Valves.
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A Dalton
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