05PCM to 07PCM need help/suggestions

[Ian30]

Hello all, I have upgraded my pcm from a 2005 to a 2007 (NGC3 to NGC4). The engine runs, but it idles rough and is down on power throughout the whole RPM range. Eventually the throttle pedal stops working until I turn the vehicle off and back on again. It throws no codes. When I put the 2005 pcm back in, it runs great. I have tried to compare and make everything I can exactly the same in the 2007 as it is in the 2005, but then it runs slightly worse. I am not sure what to try and am frustrated at this point. Any suggestions on what I should look at or a way to troubleshoot this would be seriously appreciated.

[Hpsonny]

Hello all, I have upgraded my pcm from a 2005 to a 2007 (NGC3 to NGC4). The engine runs, but it idles rough and is down on power throughout the whole RPM range. Eventually the throttle pedal stops working until I turn the vehicle off and back on again. It throws no codes. When I put the 2005 pcm back in, it runs great. I have tried to compare and make everything I can exactly the same in the 2007 as it is in the 2005, but then it runs slightly worse. I am not sure what to try and am frustrated at this point. Any suggestions on what I should look at or a way to troubleshoot this would be seriously appreciated.

What are we working on here?

[Ian30]

It is a retrofit into a 71 D100 truck. So the motor, harness, and 545rfe trans are from a 2005 ram. I am trying to upgrade to the later PCM to gain control of shiftpoints and pressures in the transmission. I have been trying to make the 2007 work, but it runs terrible as stated in the first post. I am wondering if it is looking for more things to communicate to it on the CAN BUS and maybe I removed a wire. I did the harness 12 years ago so its a little hard to remember what I did exactly but it does run great with the 2005 computer. I am out of ideas except for maybe combing over schematics from a 2007 to see if anything is different from the 2005. I am a little short on time right now and so I was hoping someone with more experience would have a better idea of where to start.

[Hpsonny]

It is a retrofit into a 71 D100 truck. So the motor, harness, and 545rfe trans are from a 2005 ram. I am trying to upgrade to the later PCM to gain control of shiftpoints and pressures in the transmission. I have been trying to make the 2007 work, but it runs terrible as stated in the first post. I am wondering if it is looking for more things to communicate to it on the CAN BUS and maybe I removed a wire. I did the harness 12 years ago so its a little hard to remember what I did exactly but it does run great with the 2005 computer. I am out of ideas except for maybe combing over schematics from a 2007 to see if anything is different from the 2005. I am a little short on time right now and so I was hoping someone with more experience would have a better idea of where to start.

I got ya can you post the tune up on here? i?ll take a look at it

[Ian30]

These are the tunes that are in the 2005 pcm which runs great, and the 2007 PCM which runs terrible and eventually the Throttle pedal goes dead until a restart. I have tried changing quite a few things in the 2007 tune (It is the one I applied credits to and am allowed to upload) but all attempts have been unsucessful at fixing the pedal issue.