So when i stumbled across this:

http://forums.corvetteforum.com/c6-t...o-your-c6.html

It got me thinking about how to make this work in an Fbody. I know that our cars use a 411 PCM which does not support flexfuel but the 04 GTO is an ls1 and that PCM (12586243) does have a flexfuel option in that computer. Does anyone know what it would take to get that PCM working correctly in an Fbody?

I keep seeing that HPT and EFIlive support flex fueling for that computer so all it would take is wiring in the sensor and activating it in the tune (like they did above). People seem to have done it S10s and in australia but its in not well known.

Seems like there has been some success here too:
http://forum.efilive.com/showthread....-for-flex-fuel

 

I would probably try to use a 02 Tahoe 5.3L L59 12216125 OS Flex Fuel calibration to start with. It uses a 0411 pcm, and is drive by cable. .

 

yeah ive seen that that year had a flex fuel option but is the pin in our computer currently unused so that when you change to the new operating system from the tahoe its not sending that signal to a pin that we already have in use?

Basically are the pinouts the same between our two vehicles? i cant find a pinout to an 02 flexfuel tahoe

 

A 0411 PCM is a 0411 PCM regardless of what vehicle it is used on. The OS can determine the function of some pins. One thing is if you want to use a F-body VIN with a Tahoe OS and HP Tuners you will most likely get a VIN/OS Mismatch error.

 

Just load the 02 suburban flex file and populate the flex tables. Operating system is the same numbers as the 02 camamro. You can try it using the camaro os but I usually use the suburban file cause I know it works as I own a 02 burb that's flex already. Flex sensors are cheap and can be had for free off some ford Taurus at the local u-wrench-it yards. Gm sensors have quick disconnect fittings and Fords have threaded fittings that can be replaced with AN style fittings.
The sensors don't ever really go bad and can be inline on the pressure or return side of the fuel line it does not really matter which side.


Blue connector pin 56 is flex fuel signal input from sensor.

 

Post your 02 Suburban file that is the same OS as a 02 Camaro. I just looked at 6 different 02 Suburban 5.3L L59 files and they are all OS 12216125. Same as a 02 L59 Tahoe. All 02 F-bodys use OS 12212156.

 

Tuning is the last thing i have to learn so forgive my ignorance, but could you use the VIN of a wrecked tahoe or something to get around that error?

Yeah if you could post the file you are talking about that would be great. Basically any info you wanna post would be helpful if you've got a fully operationg flex-fuel capable Fbody.. all ive seen are posts about people wanting to try it and not really getting anywhere.

 

Just looked and you are correct. The os are different numbers. Too tired yesterday from being out in the heat. :-p

 

Yes you can. Some people just need the correct vehicle VIN in the PCM for emission testing in their state. Both EfiLive and Tunercat OBD2 don't care about valid VINS for different OS. It's just HP Tuners that requires it for the way they do their PCM licensing.

 

So do you have flex fuel hooked up and running on your camaro?

 

Nope, no reason not to use it though just too busy to put it on it. I am putting it in my jag as it is boosted. Still in the construction pap haste of it now. Will do a full build thread once I get a bit further along. I have tuner cats and Hptuners so am able to enable/populate the tables. I hve played with it a bit on the wife's burb just to verify it is functional.

 

saw this thread, curious...

I have a 2002 lq4 pcm...
Can the blue connector pin 56 that is "not used" be simply turned on in the tune and wired in from the sensor?
Or does the pcm have to be from a 2003+ pcm that originally had the flex fuel sensor?

 

2002 suburban L59 5.3L DBW is flex fuel and yes it's wires to the single PCM pin.

 

Would be pretty cool to get this up and running.

 

I'm seeing that they made a flex fuel 2002 6.0 also and it came with the same part number pcm...

I'd like to find a cheaper sensor to be able to do this though

 

Go to a salvage yard and get one from a ford Taurus. They are cheap new too.

 

Do they communicate the same way with the pcm?

 

Yes. Even same pinout. Fords have fuel line fittings that can be unscrewed and AN style screwed into it. GM uses pressed in fittings. The older ones are larger and all aluminum case; newer ones are all black and smaller. They just need placed in the fuel line, supply or return is fine.

This writeup makes it sound like rocket science but it's pretty simple. Albeit that this is on a G8 with different PCM. All you need to add is the inline sensor, connect ground, switched +12v power and signal out to the PCM pin. Then load a L59 file (write entire) and start tuning.

http://forum.grrrr8.net/showthread.php?t=36467

 

Why is the world not doing this?

 

Possible a segment swap could work on a 411 pcm?