I have a 2001 Sable with the CEL on which has 110,000 miles on it. Occasionally it will go off for 100 miles and then return. Sometimes during idle it will blink off and on and the idle will be rough, but once I start going it will go to steady on. It has a 3.0 24V DOHC 6cylinder engine. The DTC codes are P0401 - insufficient EGR flow and P0304 - cylinder 4 misfire. I replaced the EGR valve and cleaned the attached hoses, replaced all spark plugs with Bosch double platinum plugs, and replaced the back pressure sensor for the EGR valve. Gas mileage is normal. Any suggestions as how to proceed from here would be greatly appreciated.
have the same problem?
Sunday, March 11th, 2007 AT 3:08 PM