hey just wanted to blog about my ideals.....
anyways long story short all in a nut shell here (dont want to complain too much)
P0420 - lower catalyst efficiency below threshold for the past year or so
-replaced 3 cats (not cheap) and my upstream and downstream O2
-problem came back, took it to dealer (in knoxville TN), they tell me cylinder 1 has a leaking head gasket (coolant), so i had them replace BOTH head gaskets....(arm and a wiener still under extended warrenty)
- rough idle still ramains slightly so they take top end apart again and replace UIM (again) gasket as well as injector o-rings
- rough idle still remains still no SES light since head gasket change, so i replace the catalytic converter.....again
- rough idle remains so i take it to the dealer here (in frederick MD), they drive it around with some scanner (doubting a master scanner now) and tell me nothing is wrong with it, and they charge me 50$ and send me on my way and advised me any further diagnostic would require OEM parts be present (all you can only see is my intake, and thats basically all i have now) /facepalm
- rough idle still remains this time (today) the SES light comes on for P0420 *lower catalyst efficiency below threshhold*....again.....
gotta wait till monday obviously but you can *insert frustration here*
car is under an extended bumper to bumper warrenty, i just dont know what this dealer will do about my hardcore warrenty breaking intake......i have nothing else to say but to congratulate GM on such a prestine, divine motor, of epic longevity
PS. input?