egr not working on 2001 Chevrolet S10

my 01 s10 blazer has rough idle but i can unplug egr valve and it idles good ive already replaced egr but still has same problem what could it be?

by in Owens Cross Roads, AL on January 12, 2011
3 answers 4 comments
ANSWER by on January 12, 2011
usually the egr picks up carbon and the valve remains open causing a vaccuum leak that makes the idle very erratic. Roy
COMMENT by on January 29, 2011
i've already replaced egr and it still giving code egr closed performance, what could it be need help!!
ANSWER by on January 12, 2011
I think Roy is correct. The valve might be open due to carbon deposit, ECM or wiring problem. There is a new style gasket developed with a fine screen which would stop the bigger pieces of carbon deposits to enter the valve. Faulty pintle position sensor could also keep the valve open. Zee
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COMMENT by on January 29, 2011
already replaced egr and still giving code egr closed performance ,what could it be,please help!!
COMMENT by on January 29, 2011
Faulty pintle position sensor in the new EGR valve could keep the valve open. Zee
ANSWER by on January 12, 2011
Check for vacuum leaks? This egr should be electronic. I would also check fuel pressure as well. Do you have any check engines lights on? If so, what are the codes?
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COMMENT by on January 29, 2011
already replaced egr and still giving code egr closed performance, what could it be ,pleasae help!!