Tonyrodz's Tahoe Build Thread

[Fless]

Did you find the menu to reset the long term fuel trims? I would recommend that, but I'm not seeing anything amiss. It goes into closed loop and the short term fuel trims are dead on, well within the desired management window.

Only 1 misfire in 4 cycles of misfire data on a couple of cylinders, nothing to worry about. If you collect more cycles, do the misfire counts go up?

 

[Tonyrodz]

Did you find the menu to reset the long term fuel trims? I would recommend that, but I'm not seeing anything amiss. It goes into closed loop and the short term fuel trims are dead on, well within the desired management window.

Only 1 misfire in 4 cycles of misfire data on a couple of cylinders, nothing to worry about. If you collect more cycles, do the misfire counts go up?

No, they don't go up. I looked all over the menus to reset fuel trims but couldn't find it. Can they be reset on the NBS? Or is it just the NNBS?

 

[HiHoeSilver]

No, they don't go up. I looked all over the menus to reset fuel trims but couldn't find it. Can they be reset on the NBS? Or is it just the NNBS?

You can reset them. I don't have a tech 2, *hangs head in shame, but have had them reset on mine before.

 

[Fless]

I think the LTFTs reset if the battery is disconnected. Might have to touch the two battery CABLE ends together while it's disconnected.

 

[HiHoeSilver]

I'm with @Fless here. Reset them and then see what they do. The long terms adjust based on what the shorts are doing. Your shorts show no reason for the longs to have moved that far. Maybe just old data and we're barking up the wrong tree.

 

[Fless]

I'm with @Fless here. Reset them and then see what they do. The long terms adjust based on what the shorts are doing. Your shorts show no reason for the longs to have moved that far. Maybe just old data and we're barking up the wrong tree.

Woof woof.

 

[Tonyrodz]

Some vids of the Tech 2 while the Tahoe is running.

 

[HiHoeSilver]

I think the LTFTs reset if the battery is disconnected. Might have to touch the two battery CABLE ends together while it's disconnected.

Hmmm. Maybe that's true. Iirc, it didn't work for me and needed my buddy with a bidirectional tool (not T2) to do it.

 

[Fless]

To reset the long term fuel trims, connect the Tech 2 and enter your vehicle information, and go into the Powertrain menu. Of course you'll want to be in the Diagnostics menu.

> Special Functions
> Fuel System
> Fuel Trim Reset. It collects some data for a few seconds.
On the next screen the fuel trims are shown, and a soft menu item "Reset" at the bottom of the screen should appear. In order to select it, press the corresponding soft key (just below the screen) once -- or you might need to do it a second time -- and the LTFTs should reset to zero. (Since the engine is not running, the STFTs are static at 0.)

 

[HiHoeSilver]

To reset the long term fuel trims, connect the Tech 2 and enter your vehicle information, and go into the Powertrain menu.
> Special Functions
> Fuel System
> Fuel Trim Reset. It collects some data for a few seconds.
On the next screen the fuel trims are shown, and a soft menu item "Reset" at the bottom of the screen should appear. In order to select it, press the soft key (just below the screen) once -- or you might need to do it a second time -- and the LTFTs should reset to zero. (Since the engine is not running, the STFTs are static at 0.)


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