2001 Chevrolet Impala Q&A
2001 Chevrolet Impala Question: How do I clean the EGR ports prior to installing an new EGR valve.
Removal of EGR valve is required in order to clean Ports. Indeed if ports are not cleaned and remained plugged it will set a Diagnostic Trouble Code. Upon removal of EGR if ports are plugged the use of a long pick or any hard object can be used to clear passages and remove carbon. The use of air can be used to blow into passage to make sure they are clear. - Protech2989