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

j91z28d1 · Dec 2, 2024

I'm terrible with the math, but if you can find out how much richer e55 needs to be compared to e10 gas. it was probably that much to rich before you reset everything?

I see something like e85 needs to be 30-40% more fuel for the same volume of gas, so e55 guess 25% rich?

I don't know, fuzzy maths haha.

Doubeleive · Dec 2, 2024

j91z28d1 said:
I'm terrible with the math, but if you can find out how much richer e55 needs to be compared to e10 gas. it was probably that much to rich before you reset everything?

I see something like e85 needs to be 30-40% more fuel for the same volume of gas, so e55 guess 25% rich?

I don't know, fuzzy maths haha.

I don't know much about the e85 calculation but you're probably right about having a physical sensor that would likely help correct any problems.

Charlie207 · Dec 2, 2024

Doubeleive said:
I guess I am in the market for a 02 sensor bank 1 sensor 1 it threw a P0134 once and P015b 3 times on the road trip
just got back home, probably change it out in the morning when it is cool

I got an intermittent P219A after the Thanksgiving blizzard drive. Last time it was present I installed two new upstream O2 sensors, and that had resolved the issue for the past couple months. It's super annoying to get it back.

Doubeleive · Dec 2, 2024

Charlie207 said:
I got an intermittent P219A after the Thanksgiving blizzard drive. Last time it was present I installed two new upstream O2 sensors, and that had resolved the issue for the past couple months. It's super annoying to get it back.

i'm on the fence about going ahead and replacing the other side as well, the post cat ones I already replaced a few months ago before i discovered the clogged cat issue.
might wait till march when we have another trip twice as far :shrug:

Charlie207 · Dec 2, 2024

Doubeleive said:
i'm on the fence about going ahead and replacing the other side as well, the post cat ones I already replaced a few months ago before i discovered the clogged cat issue.
might wait till march when we have another trip twice as far

How important are the downstream sensors? My upstream were obviously causing the issues, and made an overall difference to the engine after changing them out. I've never changed the downstream sensors out, and should probably just bite the bullet.

Doubeleive · Dec 2, 2024

Charlie207 said:
How important are the downstream sensors? My upstream were obviously causing the issues, and made an overall difference to the engine after changing them out. I've never changed the downstream sensors out, and should probably just bite the bullet.

I believe the post cat ones just monitor the cat efficiency function, the upstream are more important
never had any driveability issue's with bad cat's or a cat code, but this bank1 02 did cause a little bit of issue, right before it would pop a code I could feel a little shifting problem once and another time I could feel some deceleration surging. I am assuming that's because it was sending faulty data to the maf which was in turn trying to correct it. when I reset the code it would go back to driving normal

89Suburban · Dec 2, 2024

I touched it. I haven't touched it in 4 days. Still on the lift. Coming home tomorrow. Almost there. I been getting no sleep since I took it in. Up half the night every night. The anxiety is kicking my ass.

Fless · Dec 2, 2024

89Suburban said:
I touched it. I haven't touched it in 4 days. Still on the lift. Coming home tomorrow. Almost there. I been getting no sleep since I took it in. Up half the night every night. The anxiety is kicking my ass.

It'll be good, and worth the wait! Quality takes time....

89Suburban · Dec 2, 2024

Fless said:
It'll be good, and worth the wait! Quality takes time....

I know. I worked so hard for this. I just want her back home.

Grady_Wilson · Dec 2, 2024

Doubeleive said:
i'm on the fence about going ahead and replacing the other side as well, the post cat ones I already replaced a few months ago before i discovered the clogged cat issue.
might wait till march when we have another trip twice as far

If the O2 sensor has over 50k miles on it I would replace it.
I wouldn't want each bank to be that out of sync with the other.
I know it is a PIA to do both but that is how I do the maintenance on my vehicles.
Seems to have worked well so far on all my vehicles, I have never been stranded and the one has 250k trouble free miles on it.

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

j91z28d1

Full Access Member

Doubeleive

Wes

Charlie207

Full Access Member

Doubeleive

Wes

Charlie207

Full Access Member

Doubeleive

Wes

89Suburban

Bull in the china shop

Fless

89Suburban

Bull in the china shop

Grady_Wilson

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