loading a new bin??

[2004gmc]

First:
connect cable to vehicle and start tunetool,
select your contoller (is it 1999-2008 LS1 PCM...?),

2004 gmc 6ltr i dont see it so i figure 99-2008 ls1 right??

[2004gmc]

thanx joecar that loaded not sure on the performance yet

[joecar]

I don't know...

Try 1999-2008 LS1 and try reading the PCM... if it successfully reads, then that's the right one.

If you cannot successfully read the PCM, then do not write to it.

[2004gmc]

yes it read no problems

[joecar]

Ok, save the read binary to file... and make a backup copy to CD or USB memory fob... this is your original tune.

Follow the steps in post #10...

Do not do a full flash (it is not necessary unless you are changing OS).

[joecar]

First:
connect cable to vehicle and start tunetool,
select your contoller (is it 1999-2008 LS1 PCM...?),
read the flash (Flash->Read PCM Calibratioon),
save to file (File->Save tune as),
turn ign key off for at least 15 seconds,

You did all that successfully, right...?

Then do the following only if the read was successful:
copy the email tune file to My Documents\EFILive\V7.5\Bins,
open the tunetool,
open that file,
open as alternate file your stock tune file (File->Load Alternate)... you must have previously done this,
compare the two (File->Display Calibration Differences),

If you could compare the two files and the differences make sense then continue:

if they can be compared, and if the changes are safe, then proceed,
turn ign key on and restart tunetool (and open email file),
do a cal-only flash (Flash->Program PCM Calibrations), it should take less than 30 seconds,
when flash has finished, turn off ign key off for at least 15 seconds.

[2004gmc]

yes no problems in comparing lots of changes from my stock one . it runs but idle was low at start but seems better now

[joecar]

Before flashing take these precautions:
0. make sure your laptop battery is fully charged,
1. make sure your vehicle battery is fully charged,
2. pull up the ebrake (to keep the daytime running lamps off),
3. shut all doors (to keep dome lamp off),
4. shutdown all accessories (stereo, headlights),
5. keep you foot off the brake pedal (keep stop lamps off),
6. don't play with anything in car while flashing,
7. don't move cable while flashing (keep still),
7. disable OnStar if it tries to talk on the serial bus (pull it's fuse).

Basically, you want to avoid two things:
- any voltage drops, current flows, of voltage/current spikes,
- any module chatting on the serial bus (like OnStar or BCM when door opens).

If you read ok, then writing should be ok.

[joecar]

yes no problems in comparing lots of changes from my stock one . it runs but idle was low at start but seems better now

You flashed it, it went good...?

[2004gmc]

yes flashed good .now my next task got tips for me? lol http://forum.efilive.com/showthread....5796#post95796