Help car wont run after flash

[Duke]

ok i have sucsessfully read and programmed my pcm a few times now.. but today i decided to try to flash another bin file to in.. in perticular a h/c cc503 bin i found on here for a 94 M6 camaro, i have a 94 trans am. it errored out 2 seconds into flashing.. i didnt even think it had started yet. now when you turn the key foreward both fans come on. and when you start the car it just idles down around 500rpm untill it just dies off, touching the gas instantly kills it.. i cant get datamaster to connect and read anything while it is actually running and when i try to reflash back to my stock file, i get unable to communicate with my PCM. can someone please point me in the right direction ? i've tried unhooking the battery for over 15 minutes 3 times now.. and still cant get it to read.. i can however
see that my VIN is still there under vin information, and i can also see that it still says Pontiac Formula or Trans am in that spot also.

[Duke]

just to update its even worse now.. after pulling the pcm batt fuse and disconnecting the battery for a few minutes the car starts but instantly dies like i have a dead BCM or an invalid vats chip.. can someone let me know if its possible to force flash a odb1 computer with some software?
a new pcm is going to cost me 175$

[kevinblownta]

Duke, i sent you a pm because I wasnt able to post, but seems good now...

Anyway when something goes wrong with a write flash, the T and E side chips seem to get corrupted and need to be replaced. There are a few guys out there who will repair that for you and put them in a socket in case it happens again - even give you spares. It's not uncommon, although it shouldn't happen. It won't cost $100. Alternatively, you could buy a used PCM for $50 or so.

Just curious, did you use a serial port or USB adapter or cable?

[Duke]

i used a USB cable from akm cables, i think the issue what trying to flash a downloaded bin from here.. from now on im only going to work with my stock bin file and just use other peoples tunes as a compare point. thanks for all the help

[MEAN LT1]

That is so weird, every time i hear about bad flashes it its from people who have usb connections. Ive flashed over 100 time on man pcm's and not one bad flash yet. I wonder if its a usb thing?

[playtoy_18]

I've had two bad flashes before.
Both were due to my computer losing power during an upload.
Reflashed both again and no issues.

And never trust a tune from the net,copying others work (whether it's offered or not) doesn't teach you how to tune.
There is way too much written info on the net that is bad,that I don't trust many files I see.
I've used a couple peoples flashes before,but they were specifically wrote for me and by people I trust.
I just used them for comparison or baseline.