[AT] GM Flex Fuel vehicles

[pga2 at hot1.net]

Charlie,
My suspicion is that the computer has a different load in it, mainly to
keep the injectors open about 20% longer than the gas version. The only
other thing i could possibly envision is that the injectors are a
different rating (lbs. of fuel/hour). The need is there since E85 doesen't
have as many BTU/gal. as gasoline, much like propane. I sure would be
interested in finding out for sure.
You might want to ask the service manager at your dealer if he can tell you.

Phil

> I have a question for the resident GM experts.
>
> I have a 2006 GMC sierra pickup.  That same truck and same engine are
> available in a Flex Fuel (E85) version.   I have no plan on trying to
> switch
> mine but I'm curious about the mechanical differences in the two engines.
> Obviously the computers are set up different but does anyone know what
> else
> is different about them?
>
> Seems to me that since GM makes them both ways it should be possible to
> change the gas setup to flex fuel with off the shelf parts.
> It would probably cost too much and right now it wouldn't make much sense
> to
> do it anyway.  I'm just curious about the process.
>
> Charlie
>