tune wouldn't write

[jophis37]

Last week I went out on my 91 octane tune running 17 psi. The opportunity came up for some races, so I swapped out the pulley for a 19 psi one and when I went to swap the tune out w/ my XCAL 2 the XCAL stopped half way through. Now this happened once before, end result I had to buy another PCM. It may had something to do w/ the battery not putting out enough voltage. I know guys pull the fan fuse/rlay so it doesn't add a drain on the battery. Well, I got luckey on this one. I disconnected the battery for about 10 mins (that's how long it took to get a replacement) and installed an almost new Optima. Re-wrote the tune and everything was fine. Oh I left out that after the tune failed to write the first time, the dash/ odometer read out had dashes across it. anyone else had this happen to them before? Is it a common think linked to the battery?

 

[SlowSnake]

I had that problem the first time I wrote my new tune but I just tried again and it worked....turn off all accessories

 

[jophis37]

I tried that the fist time and some how ended up w/ a fried PCM. I have no idea why it happened. I was told that the battery didn't have enough output volts. I'll check this weekend to see where it's at.

 

[jophis37]

I tried that the fist time and some how ended up w/ a fried PCM. I have no idea why it happened. I was told that the battery didn't have enough output volts. I'll check this weekend to see where it's at.

 

[mpe331lx]

It happend to me the first time that I tried to install a predator tune in my old 04 GT. The tune did not write, the odo read ------, and the car would not start. I thought that i was screwed. I was able to put the factory tune back into the car, and all was well. I dont know if the Xcal is the same way, but the only thing that I did different any other time was to make sure my cell phone was turned off. For some odd reason, a cell phone will interfere with the writing of a tune.

 

[jophis37]

It happend to me the first time that I tried to install a predator tune in my old 04 GT. The tune did not write, the odo read ------, and the car would not start. I thought that i was screwed. I was able to put the factory tune back into the car, and all was well. I dont know if the Xcal is the same way, but the only thing that I did different any other time was to make sure my cell phone was turned off. For some odd reason, a cell phone will interfere with the writing of a tune.

lol, That would be funny if cell phones were to blame for this. I've writen tunes to the pcm several times now and never had a ny issues, I wonder what it could have been? I still have the same battery and it works fine.??????