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?

Asked by for the 2001 Chevrolet S10
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?
already replaced egr and still giving code egr closed performance, what could it be ,pleasae help!!
3 answers 4 comments
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

already replaced egr and still giving code egr closed performance ,what could it be,please help!!
Faulty pintle position sensor in the new EGR valve could keep the valve open.

Zee
usually the egr picks up carbon and the valve remains open causing a vaccuum leak that makes the idle very erratic.


Roy
i've already replaced egr and it still giving code egr closed performance, what could it be need help!!