What the what?? 2006 avalanche flex fuel

[vonrottes]

My mom bought a 2006 avalanche z71 last month, vin Z with the L59.. which I think was the only option on that trim.

 

But I was messing around in the tune last night and noticed that it said the fuel sensor was not fitted. I've read up on these...or I guess the 2003-2005 and they had mad the fuel sensor and fuel filter on the frame, under the driver's door, next to the transfer case and torsion bar... 20 minutes with a flash light and crawling around in the cold.... Her truck does not have a fuel sensor OR a fuel filter....

 

So I'm really curious as the how the hell the flex fuel works on this thing, can anyone here explain?

All I can find online is UP TO 2005.

 

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[STEVE-O]

Fuel filter is in the tank

[Cordell]

Flex fuel works on those by calculating alcohol content via fuel trims after a fill up. Lots of GM cars were produced in that time frame without sensors. It's a flawed stupid system that is prone to miscalculating and having issues.

[vonrottes]

Flex fuel works on those by calculating alcohol content via fuel trims after a fill up. Lots of GM cars were produced in that time frame without sensors. It's a flawed stupid system that is prone to miscalculating and having issues.

Wow. I mean I've heard of the sensors going bad a lot and they are expensive as shit... But to completely ditch the fuel composition sensor for calculations that basically relays on the O2s.

 

Thanks, for the info man.

 

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