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

[Doubeleive]

reset the fuel trims and alcohol content this morning and drove on the freeway about 40 minutes, didn't notice anything different
driving like a normal person 70~80 the cats stayed around 1500, if I speed up and drive like I normally do 85-90 then that cats ran in the low 1600's
mpg went up to 10.7
actual mileage on this tank if everything is correct based on trip mileage and what it says I have left in range then it should be an actual of 11.4

 

[swathdiver]

reset the fuel trims and alcohol content this morning and drove on the freeway about 40 minutes, didn't notice anything different
driving like a normal person 70~80 the cats stayed around 1500, if I speed up and drive like I normally do 85-90 then that cats ran in the low 1600's
mpg went up to 10.7
actual mileage on this tank if everything is correct based on trip mileage and what it says I have left in range then it should be an actual of 11.4

That's some progress, no?

 

[Rocket Man]

Those look much nicer than the old fobs. i have an 09 yukon denali. i need to pick up another fob and key. From what i am reading, the fob can be programmed by me (a couple youtube videos show the process), but the key needs to be cut and programmed by a dealer or locksmith. Is this correct? TIA

You can program both the fob and the key, the locksmith can cut the key.

 

[Doubeleive]

That's some progress, no?

yes, but most of my trips are around town anymore, never have time to go anywhere that would bring the mileage up.

 

[gooffeyguy]

reset the fuel trims and alcohol content this morning and drove on the freeway about 40 minutes, didn't notice anything different
driving like a normal person 70~80 the cats stayed around 1500, if I speed up and drive like I normally do 85-90 then that cats ran in the low 1600's
mpg went up to 10.7
actual mileage on this tank if everything is correct based on trip mileage and what it says I have left in range then it should be an actual of 11.4

How do you reset the alcohol content?

Also, don't you have aftermarket cats, or exhaust? That may make a difference.

2001 Yukon SLT
2012 Yukon Denali XL
2011 Yukon Denali RIP 5/20/18

 

[Doubeleive]

How do you reset the alcohol content?

Also, don't you have aftermarket cats, or exhaust? That may make a difference.

2001 Yukon SLT
2012 Yukon Denali XL
2011 Yukon Denali RIP 5/20/18

the alcohol content reset is right above the fuel trim reset in the same menu, yes I had magnaflows put on there but that shouldn't make any difference

 

[Mickey_7106]

This probably doesnt help you any, but i wanted to play more with this obdlink app and see if its able to track cat temps


This is cold start and 10 min idle

Cruising for about 10 minutes on the highway

These last 2 were me trying to get them hot at WOT. they cooled down pretty quick to about 13xx once i slowed down but i didnt take a screenshot

 

[R3cord303]

This probably doesnt help you any, but i wanted to play more with this obdlink app and see if its able to track cat temps


This is cold start and 10 min idle

Cruising for about 10 minutes on the highway

These last 2 were me trying to get them hot at WOT. they cooled down pretty quick to about 13xx once i slowed down but i didnt take a screenshot

View attachment 230936

Are cat temps different with e10 vs e85?

 

[Mickey_7106]

No clue. I just filled up on pump gas from about 1/4 tank. Gonna go for dinner later 20 minutes away. Gonna try to log during that time.

Are cat temps different with e10 vs e85?

 

[Woodblocker55]

How does it's dream up the ethanol percentage ?
Cats run hot wow . Hate see cat temp pulling 8000 lbs . ( 14,000 lbs GCVW ) In month I might be able to tell ya [emoji106]

Sent from my LGL84VL using Tapatalk

 

[R3cord303]

How does it's dream up the ethanol percentage ?
Cats run hot wow . Hate see cat temp pulling 8000 lbs . ( 14,000 lbs GCVW ) In month I might be able to tell ya [emoji106]

Sent from my LGL84VL using Tapatalk

Flex Fuel vehicles have an alcohol sensor in the fuel rails IIRC.

 

[Woodblocker55]

Flex Fuel vehicles have an alcohol sensor in the fuel rails IIRC.

Does my 2006 have it ? It's flex fuel California emissions. In Minnesota. Yes it came from New York. ?

Sent from my LGL84VL using Tapatalk

 

[Doubeleive]

This probably doesnt help you any, but i wanted to play more with this obdlink app and see if its able to track cat temps


This is cold start and 10 min idle
View attachment 230933


Cruising for about 10 minutes on the highway
View attachment 230934

These last 2 were me trying to get them hot at WOT. they cooled down pretty quick to about 13xx once i slowed down but i didnt take a screenshot

View attachment 230935

View attachment 230936

Thanks my cat's are 700deg almost instantly, but otherwise not all that far off I have a heavy foot

 

[Mickey_7106]

the easiest way to know is badges and yellow fuel cap

Does my 2006 have it ? It's flex fuel California emissions. In Minnesota. Yes it came from New York. ?

Sent from my LGL84VL using Tapatalk

 

[R3cord303]

Does my 2006 have it ? It's flex fuel California emissions. In Minnesota. Yes it came from New York. ?

Sent from my LGL84VL using Tapatalk

If its Flex Fuel yes it has an alcohol sensor. It has to have one, because depending on alcohol content, it will vary the fuel and spark tables.

E85 is rarly 85% alcohol if you’re getting it from the pump which is why the sensor is so important.

 

[kbuskill]

If its Flex Fuel yes it has an alcohol sensor. It has to have one, because depending on alcohol content, it will vary the fuel and spark tables.

E85 is rarly 85% alcohol if you’re getting it from the pump which is why the sensor is so important.

Actually the NNBS trucks don't have a sensor like the NBS trucks did... the NNBS trucks calculate the alcohol content via the O2 sensors. That is why it takes a few miles for it to settle in.

 

[HiHoeSilver]

Actually the NNBS trucks don't have a sensor like the NBS trucks did... the NNBS trucks calculate the alcohol content via the O2 sensors. That is why it takes a few miles for it to settle in.

This. Actually started with NBS in 06. NO actual sensor. They call it VFFS, virtual flex fuel sensor.

Have never gotten solid info on how it calculates.

 

[iamdub]

This. Actually started with NBS in 06. NO actual sensor. They call it VFFS, virtual flex fuel sensor.

Have never gotten solid info on how it calculates.

It's GM's revision of the Hydrocilator. Duh.

 

[wjburken]

This. Actually started with NBS in 06. NO actual sensor. They call it VFFS, virtual flex fuel sensor.

Have never gotten solid info on how it calculates.

I thought I read somewhere that they went back to actual sensors on the K2XX platform.

 

[HiHoeSilver]

I thought I read somewhere that they went back to actual sensors on the K2XX platform.

Possible. I've never looked into it.