rrmccabe
August 3rd, 2016, 03:02 AM
I am having an issue with a 06 TBSS and leaning towards it being a bad ECM. I know it sounds unlikely but have ruled out most other things.
First of all the truck has a 408 in it. I had it dyno tuned and the tuner used EFI-live to do so.
Shortly after that I started getting a P0353 code (primary circuit coil 3) and when the TCC locks up it chugs. I am not positive they are related but I am not going to troubleshoot the chug until I get rid of code. When I say shortly after I mean it ran fine for a couple months/1000 miles.
I dont think its tune/EFI related unless its something to do with custom OS. I flashed back my HPT tune and the issue is still there.
I swapped coils to another cylinder and the problem stays with #3. I bought a new coil connector and soldered the 12 volt, ground and reference wire to the #1 coil since they are all common wires. I ran a dedicated test wire back to the ECM for the IC "trigger wire". Still sets the same code.
So main question unless someone has something add to my troubleshooting is about swapping ECMs. Can I do everything with EFI live? I realize I need to do a case relearn when I do this and a security learn if the ECM is used. But was not sure if EFI would take care of entire OS, etc?
I hate to go this route as there is not only the cost of ECM but of course I am burning credits on my EFIlive and HPT (if I decided to keep and use it).
This GM part number covers a lot of vehicles and some can be bought cheaper than others so did not know if I could buy a same PN out of a Buick without doing additional work.
First of all the truck has a 408 in it. I had it dyno tuned and the tuner used EFI-live to do so.
Shortly after that I started getting a P0353 code (primary circuit coil 3) and when the TCC locks up it chugs. I am not positive they are related but I am not going to troubleshoot the chug until I get rid of code. When I say shortly after I mean it ran fine for a couple months/1000 miles.
I dont think its tune/EFI related unless its something to do with custom OS. I flashed back my HPT tune and the issue is still there.
I swapped coils to another cylinder and the problem stays with #3. I bought a new coil connector and soldered the 12 volt, ground and reference wire to the #1 coil since they are all common wires. I ran a dedicated test wire back to the ECM for the IC "trigger wire". Still sets the same code.
So main question unless someone has something add to my troubleshooting is about swapping ECMs. Can I do everything with EFI live? I realize I need to do a case relearn when I do this and a security learn if the ECM is used. But was not sure if EFI would take care of entire OS, etc?
I hate to go this route as there is not only the cost of ECM but of course I am burning credits on my EFIlive and HPT (if I decided to keep and use it).
This GM part number covers a lot of vehicles and some can be bought cheaper than others so did not know if I could buy a same PN out of a Buick without doing additional work.