Hello, all Newbie to PCM Progamming With some questions.
I have a 1997 Chevy Suburban K1500 with a new L31R Crate engine in it. I installed the Chevrolet Performance Hydraulic Roller Camshafts 12677151 (Duration at .050 in. 215/223, Lift .473/.473), New Style Fuel Injection Spyder, and Doug Thorley Headers. I installed E-fans from a 2002 GMT800 Suburban.
Knowing these mods would be beyond the capabilities of the stock computer I planned on doing a 0411 PCM Swap and aquired a 0411 PCM from a 2002 Suburban w/ the 5.3l.
My intention was to program this with a tune to add the efans and handle the cam and headers. Bought a MVPI2 in February with 2 credits thinking this was all I would need.
Finally finished all the mechanicals and was ready to tackle the swap. I planned to program the computer (built a bench cable) with a tune from the repository from an 2002 Chevy Van with the L31.
I made my attempt the other night, connected my 0411 to the bench cable loaded the 2002 Chevy Van file from the repository and wrote it to the PCM. It stated it completed successfully and I closed the program, packed up my stuff and went home as I had done this after work at my desk.
I get home and hook everything back up to look at the the pcm and save off the new file and the PCM won't read. [detect protocol failure]
I contact support, send all the logs, after their analysis they tell me.
"Hi David,
This ECM that you read and sent the information in on is in need of being replaced. I can't explain what caused it to die but it will need to be replace."
and
"Hi David,
It is possible that a file was not compatible, really can't say on a PCM that was 17-20 years old. Unfortunately the license will be lost on this PCM and changing it to the new one will cost to re-license."
No explanation of what occurred. I have no idea if I did something wrong or what, the PCM read w/o incident several times before writing the new tune to it.
Can't read the logs, they're encrypted and now I'm out $100.00 in licenses.
OK live and learn, I goto the wrecking yard and find a 2002 GMC Savana with the 5.7L L31 in it and I buy it and bring it home. I figure, "hey this already has the tune I need right, just a few modifications."
So I want to make sure that I'm doing this right this time.
Looks like I'll need to buy 2 credits to license this PCM. Once I do I can go in and do the following:
- Disable VATS and EGR
- turn on EFans
- Set tire size (35")
- Adjust shift points
- Figure out how to clean up the idle and adjust for the New Fuel injectors (running rich now)
What I don't want to do is brick another PCM.
Is this a sound plan of action?
Thanks in advance,
Dave R.