Question about 2001 Buick Century
We have replaced EGR valve and the light will go out for a little while and then it will glitch and come back on. We think it may be one of the 5 wires leading to it but don't know which one. Help!
If you have the 3.1 engine, they are prone to having the egr passage clog up in the intake. There are 3 solenoids on the valve that open under differant load conditions. Sometimes during high egr flow demands the passageway is clogged enough for the computer to see not enough change in map or o2 sensor readings. Take off the valve, open up the throttle and see if there is carbon deposits caked up where the egr port is. If so get some GM top engine cleaner spray and a wire and clean the passage. This is a common problem.
Posted on Nov 27, 2008
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Posted on Jan 02, 2017
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