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Maybe it's not closing all the way? I have a 96 roadmaster wagon and have been getting check engine light lately - code error is EGR related P0400. Found out there is service bulletin for corrosion problems with the valve.

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โˆ™ 2008-07-25 06:47:57
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Q: What would cause the egr valve on your 96 buick roadmaster wagon LT1 engine to open to early the car runs rough at low rpm the egr is getting 15 inches of vacuum?
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