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04 V6 3.4L. Failed emissions. Replaced EGR valve & gasket, MAP sensor, IAT sensor, alternator, Upstream and Downstream O2 Sensors, idler tension pulley, idle control, purge solenoid, hard vacuum lines, pvc valve, pvc tubing and STILL getting P0401 after car performs EGR readiness test. Runs great. No stall, no surge, fuel trims close to 0 except if idling long time then runs higher positive of 15-20 whereas they were all super negative I.e. -10. Cannot get evap test readiness at all over last 2 months despite running drive cycle for it multiple times. Have cleaned EGR valve, tubing multiple times with carb cleaner and a brush. Any thoughts? No more hard starts either after replacing alternator and idler pulley. I’m over $1000 parts only as doing own labor and I’m about to pull all my hair out as is my husband.
What makes this problem better or worse?
Code kicks after car completes EGR readiness test
How long has your 2004 Pontiac Grand Am had this problem?
Drove car for over a year with cel on but started changing things since not passing emissions 12/29/23
