What did you do to your NNBS GMT900 Tahoe/Yukon Today?

Doubeleive · Dec 16, 2023

RooTBeeRthe1st said:
Have you gotten smog tested while having a tune?

yes and no
I originally had a hypertech tune (carb compliant)
the hypertech when installed gets married to the ecm & tcm
had the transmission upgraded and forgot to remove the hypertech first
transmission came with a new tcm, so this made the hypertech think it is no longer married and basically is a brick
so I got the bb tune and the stock file is now the hypertech tune
last time I got it smogged I removed the bb tune it put it back to the hypertech
passed no problem.

iamdub · Dec 16, 2023

Unless they look at more stuff or look deeper in CA, I never had a problem passing with my rear O2 codes turned off. All readiness monitors set just fine.

gooffeyguy · Dec 16, 2023

iamdub said:
Unless they look at more stuff or look deeper in CA, I never had a problem passing with my rear O2 codes turned off. All readiness monitors set just fine.

But..... don't you get your stickers from a buddy? When was the last smog test you've done? :secret:

iamdub · Dec 16, 2023

gooffeyguy said:
But..... don't you get your stickers from a buddy? When was the last smog test you've done?

Only the past two years. Had O2s and other things turned off in '17, so I've passed four emissions inspections with it, the final one in '21 with it cammed/modded with no cats. No visual inspections here although that's easy enough to pass. I don't believe they've changed anything in the testing.

justchecking · Dec 16, 2023

I changed the four driver side plugs at 50k miles. I recently changed plugs in my older daughters Escape and younger daughters Wrangler at 100k miles and they were severely worn, like no electrode remaining so I decided to start changing all plugs at 50k. I changed the driver side in nothing flat. Then I looked at the passenger side. I only had an hour and a half to change those four plugs, eat lunch, and go to my eye appointment. So… those will have to wait.

j91z28d1 · Dec 16, 2023

iamdub said:
Unless they look at more stuff or look deeper in CA, I never had a problem passing with my rear O2 codes turned off. All readiness monitors set just fine.

this is the ticket. what software was used to turn off the rear o2? seems readiness is the key.

since I have hp on the truck already, I'd definitely try that before replacing a cat and see what happens cause it would be eazy to turn back on. I don't know if bb it would cost you money to try

j91z28d1 · Dec 16, 2023

justchecking said:
I changed the four driver side plugs at 50k miles. I recently changed plugs in my older daughters Escape and younger daughters Wrangler at 100k miles and they were severely worn, like no electrode remaining so I decided to start changing all plugs at 50k. I changed the driver side in nothing flat. Then I looked at the passenger side. I only had an hour and a half to change those four plugs, eat lunch, and go to my eye appointment. So… those will have to wait.

I suggest a koken plug socket

https://a.co/d/g5oQSS9

and of all things harbor freight has a black extension set that has this little like 1 and half in extension, that and a flex head ratchet I've used that little extension more times than I can count. but if I remember right that's what I used and it wasn't to bad and mine has a big hybrid inverter over there in the way.

iamdub · Dec 16, 2023

j91z28d1 said:
this is the ticket. what software was used to turn off the rear o2? seems readiness is the key.

since I have hp on the truck already, I'd definitely try that before replacing a cat and see what happens cause it would be eazy to turn back on. I don't know if bb it would cost you money to try

HPT. Had a shop turn off AFM, the speed governor and the rear O2s cuz I was planning on long tubes eventually. Passed emissions multiple times after. Had it tuned again for the cam and mods and it passed that one time I had it inspected after that. If it weren't for the tint, I'd still be getting and passing legit inspections.

Fless · Dec 16, 2023

justchecking said:
I changed the four driver side plugs at 50k miles. I recently changed plugs in my older daughters Escape and younger daughters Wrangler at 100k miles and they were severely worn, like no electrode remaining so I decided to start changing all plugs at 50k. I changed the driver side in nothing flat. Then I looked at the passenger side. I only had an hour and a half to change those four plugs, eat lunch, and go to my eye appointment. So… those will have to wait.

@Rocket Man has an easy setup and you probably already have the tools needed: