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

[Tonyrodz]

sounds like lifter tick, I have never used sea foam but you might get lucky with some kind of cleaner or flush, my 03 did it for along time then after a oil change one day it just decided to stop, every once in a while after it has sat idling you can hear it very faintly but it has generally gone away.

I'm gonna have my buddy look at it. Better to be safe about it. Got way too much invested in the drivetrain. Just need to get it towed there.

 

[89Suburban]

Just need to get it towed there.

 

[Keviebear86]

Looking for a bit of input...

I have been having trouble diagnosing an issue, when I go to fill the gas tank it either sprays back at me or won't allow me to leave the handle pulled all the way up. Basically I have to hold the handle as low as it'll go to fill the tank and it takes a ton of time.

I have smoked the emissions system found no leaks, I keep getting the same P0446 code but it clears and stays off for weeks at a time. I guess I'm getting frustrated at this point, I have a suspicion it's the carbon canister needing replaced. Any input would be great.

Thanks!

 

[jeffsyukon]

Looking for a bit of input...

I have been having trouble diagnosing an issue, when I go to fill the gas tank it either sprays back at me or won't allow me to leave the handle pulled all the way up. Basically I have to hold the handle as low as it'll go to fill the tank and it takes a ton of time.

I have smoked the emissions system found no leaks, I keep getting the same P0446 code but it clears and stays off for weeks at a time. I guess I'm getting frustrated at this point, I have a suspicion it's the carbon canister needing replaced. Any input would be great.

Thanks!

I had a similar issue and a new carbon canister cleared up the problem.

Sent from my SM-G965U using Tapatalk

 

[Doubeleive]

Looking for a bit of input...

I have been having trouble diagnosing an issue, when I go to fill the gas tank it either sprays back at me or won't allow me to leave the handle pulled all the way up. Basically I have to hold the handle as low as it'll go to fill the tank and it takes a ton of time.

I have smoked the emissions system found no leaks, I keep getting the same P0446 code but it clears and stays off for weeks at a time. I guess I'm getting frustrated at this point, I have a suspicion it's the carbon canister needing replaced. Any input would be great.

Thanks!

pull the canister and see if little pellets fall out of it, if so then it will need replacement and you may need to blow also out the lines with air as well because the little pellets get stuck in the tube causing your problem.

 

[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.

 

[NoReverseYukon]

Looking for a bit of input...

I have been having trouble diagnosing an issue, when I go to fill the gas tank it either sprays back at me or won't allow me to leave the handle pulled all the way up. Basically I have to hold the handle as low as it'll go to fill the tank and it takes a ton of time.

I have smoked the emissions system found no leaks, I keep getting the same P0446 code but it clears and stays off for weeks at a time. I guess I'm getting frustrated at this point, I have a suspicion it's the carbon canister needing replaced. Any input would be great.

Thanks!

I was told that filling the gas tank as full as possible causes gasoline to flow into the canister. That causes the charcoal to become 1 solid block, which causes slow filling and the vapors no choice but to exit thru the fill spout.

 

[Doubeleive]

I was told that filling the gas tank as full as possible causes gasoline to flow into the canister. That causes the charcoal to become 1 solid block, which causes slow filling and the vapors no choice but to exit thru the fill spout.

I have filled my tank to the brim MANY MANY times never had that issue

 

[89Suburban]

I have filled my tank to the brim MANY MANY times never had that issue

Yup I top mine off twice a week.

 

[NoReverseYukon]

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.