School me on "Flex Fuel"

[68 TT]

There's no difference, just plug and go!

The tune in the pcm can go either way, so just running gas is fine.
Since you're probably not using the rest of the fuel lines, tank and sensor, don't even worry about if it's flex fuel or not, just treat it as a regular non flex engine.
If it is, it came with larger than standard injectors, so that's good.
Just make sure you have 58psi or so of fuel pressure.

later,
allen

Do you know how much bigger the flex fuel injectors are? I am assuming 30% to match the btu difference between E85 & pure gasoline.

[farmtruc]

Do you know how much bigger the flex fuel injectors are? I am assuming 30% to match the btu difference between E85 & pure gasoline.

Ya, you're about right.

No Flex about a 24lb'er, with flex about 33lb'er.

Here's a situation I ran into with Mic's tahoe, might happen to one of you.

We removed the AFM mechanicals during the TVS1900 install, we retro fitted it back to the '05 days, meaning we removed the lifters and replaced them with standard, remove the valley pan and replaced it with an '05 GTO (I believe) then I turned off AFM in the PCM. Of course the connectors weren't plugged in because no more recieving side.

Here's the tricky part, I could not get this Tahoe started until I flashed the PCM with a non-AFM calibration.

I'm not sure if it was because the PCM still wanted to see AFM connected or what.

just an fyi,
allen

ya, btw mic, you have a 4.8L tune in your 5.3L tahoe, lol.