What did you do to your NBS GMT800 Tahoe/Yukon Today?

[Doubeleive]

Must just be German engineering - Audis/VWs have this be a common problem. Many on my other forum deal with this after pumping more in after the pump shuts off.

I've filled it up so much you could push the little flap back and see the gas, lol

 

[Rocket Man]

Must just be German engineering - Audis/VWs have this be a common problem. Many on my other forum deal with this after pumping more in after the pump shuts off.

This isn’t an Audi/VW forum.....never heard of that issue on a GM.

 

[DougAMiller]

Arrggh!! I rebuilt my leaky Hydroboost cylinder 2-3 years ago, and this morning I had just gotten to my office parking garage when it puked power steering fluid all over the floor. Hope it won't give me trouble getting back home. Checked O'Reilly's website and the local store is supposed to have re-manufactured units in stock. So, I guess I know what I'm doing for my Friday evening.

Done! Only took an hour and a half. Just hope the reman holds up. I know these don't have a very good reputation for reliability, but at least it has a lifetime warranty.

 

[Rocket Man]

Did a bit of detailing.

 

[Fosscore]

Pulled a PO446 code this morning.



Is this the part we are looking at under the truck near the gas tank to replace with that code do you think?

 

[DougAMiller]

Pulled a PO446 code this morning.
View attachment 231920 View attachment 231921


Is this the part we are looking at under the truck near the gas tank to replace with that code do you think?
View attachment 231922

That looks different from mine. This is what mine looks like.

That said, it looks like they do the same thing, just different shape.

However, when my Tahoe threw that code it turned out that the vapor canister purge valve was the culprit (solenoid seized). It is mounted on the front of the intake manifold.

 

[Fosscore]

That looks different from mine. This is what mine looks like.

That said, it looks like they do the same thing, just different shape.

However, when my Tahoe threw that code it turned out that the vapor canister purge valve was the culprit (solenoid seized). It is mounted on the front of the intake manifold.

Good info. I replaced that one near the manifold before. I will have to look back at my thread and see if that was the same code I got. Likely it is.

I might start with that one first since it is easier and see if the code clears.

 

[DougAMiller]

Good info. I replaced that one near the manifold before. I will have to look back at my thread and see if that was the same code I got. Likely it is.

I might start with that one first since it is easier and see if the code clears.

IIRC the one at the tank is just turned on at start to purge the tank, but the one on the manifold gets a PWM signal when the engine is running to control how much it is open. So, the one on the manifold gets a lot more wear.

 

[Rocket Man]

Pulled a PO446 code this morning.
View attachment 231920 View attachment 231921


Is this the part we are looking at under the truck near the gas tank to replace with that code do you think?
View attachment 231922

I chased that code forever. I would try that purge valve you replaced again, then the vent valve by the gas tank if the first one doesn’t fix it then the charcoal canister itself if all else fails. If you have a tech 2 you can check the valves although that didn’t help me for some reason.

 

[Fosscore]

I chased that code forever. I would try that purge valve you replaced again, then the vent valve by the gas tank if the first one doesn’t fix it then the charcoal canister itself if all else fails. If you have a tech 2 you can check the valves although that didn’t help me for some reason.

Thx guys. No Tech 2 just the one in the first pic I got a while back. At least it gave me the code.

Will try that purge valve on the manifold and see how we go.

Polishing the long body now and my neighbors keep wanting to talk to me. Lol

Wife wants me to hang shelves (done) and the grass needs a trim. Dammit!! Priorities.