So I can't seem to get my truck to pass emissions due to the fact the catalyst and evap systems come up as not ready.
My truck is a 2004 that originally came with a 4.8L but now has a 6.0L. I also have aftermarket cats which I put on over a year ago. I haven't had any DTC's since I changend the cats so I don't think they are causing any problems.
I have completed the GM drive cycle many times as per the recommendation but I still won't pass.
Any suggestions would be greatly appreciated.
Not ready?
That has more to do with cycles than parts.
Maybe there's another GMWCT on here besides me that works in an emissions county....
Yeah it says not complete on the scanner then it says not ready when I get it tested.Originally Posted by GasGuzzler
Just tune them out... i have nothing of that emissions crap on my truck and i set all those flags soon as i turn the key on.
2002 Lightning - GT headed 5.5Litre w/ Twin 7665s
2002 Silverado - 427Lsx w/ Twin gt4202s
2010 Silverado crewcab Z71 - 5.3litre w/ procharger
2000 Wrangler - 5.3litre with some stance
2014 Xsport- 3.5 Eco boost
412 Motorsports
it ain't that I'm too big to listen to the rumors, It's just that I'm too damn big to pay attention to 'em..That's the difference
What codes did you change with what numbers?
anthing evap or catalyst. i set to no error
2002 Lightning - GT headed 5.5Litre w/ Twin 7665s
2002 Silverado - 427Lsx w/ Twin gt4202s
2010 Silverado crewcab Z71 - 5.3litre w/ procharger
2000 Wrangler - 5.3litre with some stance
2014 Xsport- 3.5 Eco boost
412 Motorsports
it ain't that I'm too big to listen to the rumors, It's just that I'm too damn big to pay attention to 'em..That's the difference
P0440, P0442, P0446, P0420, P0430 for a start....
yep yep...in hptuners its 3-no error reported anyone that says bank 1 sensor 2 or bank 2 sensor 2 and also there are some p0420 cat codes...they are efficiency ones
2006 silverado SS....Clifford Jr...turbo coming soon
1970 Chevelle ly6 swap....d1 coming soon
A guy on LS1tech told me to do the same thing so I will give that a try.
Thanks to everyone for the help!
no prob...it works...mine passed with flying colors
2006 silverado SS....Clifford Jr...turbo coming soon
1970 Chevelle ly6 swap....d1 coming soon
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