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

[Bombsquad85]

Got a scan tool on it. This is what its reading. Does this mean its bad?

 

[Tonyrodz]

Got a scan tool on it. This is what its reading. Does this mean its bad?

View attachment 246655

Someone posted this awhile ago. Hopefully it'll help you---
https://thetuningschool.com/blogs/news/fuel-trims-the-tuning-process
And----
https://www.aa1car.com/library/what_is_fuel_trim.htm

 

[Danny3737]

Ahhh good point guys. I was not thinking that through haha. I have some braje clean ill check that out thanks guys

I used to use incense sticks to find vacuum leaks in plumbing, never tried it on a motor vacuum issue. I’ve used starter fluid on motors, never tried brake fluid. Just have to be extremely careful since it’s so flammable.

 

[Bombsquad85]

Someone posted this awhile ago. Hopefully it'll help you---
https://thetuningschool.com/blogs/news/fuel-trims-the-tuning-process
And----
https://www.aa1car.com/library/what_is_fuel_trim.htm

Thanks man one of your links brought me here
https://easyautodiagnostics.com/gm/4.8L-5.3L-6.0L/testing-the-maf-sensor-2
And I found a testing process ill try tomorrow when its not raining.

I checked with Rock auto and I can exchange the maf I have for a new one

 

[Bombsquad85]

I used to use incense sticks to find vacuum leaks in plumbing, never tried it on a motor vacuum issue. I’ve used starter fluid on motors, never tried brake fluid. Just have to be extremely careful since it’s so flammable.

I used brake cleaner not fluid

If I had incense I'd try that. Lol. I'll try about anything to get this pos running right.

I'm almost to the point where I want to get something else. I haven't gone more than 2 weeks at a time without a CEL in the 2+ years I've owned this truck

 

[dubyagee01]

Get a cheapo stethoscope. You can pinpoint the leaks sound.

 

[iamdub]

Got a scan tool on it. This is what its reading. Does this mean its bad?

View attachment 246655

Did the numbers ever change? What if you blip the throttle, put it in gear to idle it down, etc.?

 

[ivin74]

Also heres a short clip of the exhaust. I had both cats removed. Other than that I haven't touched the exhaust.

Sounds good

 

[Bombsquad85]

Did the numbers ever change? What if you blip the throttle, put it in gear to idle it down, etc.?

I just borrowed it from Advance Auto. I did blip the throttle and slowly applied the gas and there was no change.

I bought a new K&N filter to replace the old dirty and dented Specter filter and cleared the code. Its not raining anymore so I'm going to try another test on the maf if it comes out bad ill swap it out with a replacement.

 

[Bombsquad85]

Sounds good

Thanks man. Now only if it ran good haha