Turbo 6.0

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.

krambo

iTrader: (4)

I believe you are allowed to have one rediness check "not ready" and still pass. I would just properly delete all of the catalyst efficiency codes and rear 02 codes and be done with it.

Tip for the Evap rediness that helped me--fill up to the brim with fuel and do as many short trips to operating temp as you can with a full cool down inbetween. If there are no pending codes, you just didn't hit the correct amount of hits or cycles.

mcfarlnd

iTrader: (15)

do you have the tune??? or a log??

Turbo 6.0

I am using CMR for the tuning so if you can read that I will send you a copy of the current tune.

Turbo 6.0

I tried to turn off everything that had to do with the rear O2 sensors and they just came up as not ready. Which codes should I change to do what you are suggesting? It sounds like I went a little to far by turning everything off. Also what is the difference between putting a 1, 2, or 3 next to the code?

Wilde Racing

iTrader: (26)

I thought you are using HPTuners?????


If you are you can send me your bin file to
calliedusty@sbcglobal.net

The 0,1,2,3 are report selections. 0 is report on first error, 1, is report on 2 error, 2, check but dont report, 3, is dont check.
you want them on 1 if it is all legal...

Turbo 6.0

I only use HP for scanning and smoothing VE & timing tables. I then copy into CMR.

Truckshop

iTrader: (17)

evap test will only run between 1/4 and 3/4 tank of gas.

Turbo 6.0

Good to know. I am currently at a 1/2 tank with no results.

I have also heard that the tests might be done in a certain order. If one test isn't completed it won't complete any tests after. Not sure if that made any sense or not.

budhayes3

iTrader: (19)

It's actually pretty tough to get the evap test to run, not only does the tank have to be between 1/4 and 3/4, but the ambient temp has to be between a certain parameter (something like 30 and 87*, can't remember exactly), and you have to drive a certain speed for a certain amount of time...it's amazing that evap monitors ever run lol.