Is it the tune or PCM??

[nfl8tblaz]

Have 1998 Z28, LQ9 6.0, mild mods, 4L80e
Re pinned for 99+ 411 pcm, all gauges work and car starts. Throwing P0355, P0356 codes and runs terrible. Swapped coils and issue did not follow said coil.
Had a P59 sitting around and swapped it in the car. Different tune, car starts and runs, not great but better than 411 pcm and no codes.
Question is...
Is it the 411 pcm or the tune?
Not going to re pin again for the P59.

Thanks in advance

[B52bombardier1]

The green connector port on my lab rat P59 won't allow it to mate with my 0411 or 896 PCM style of wiring harness. How did you manage to get a P59 to lash up with an older P01 style of wiring harness?

Rick

[Frost]

Have 1998 Z28, LQ9 6.0, mild mods, 4L80e
Re pinned for 99+ 411 pcm, all gauges work and car starts. Throwing P0355, P0356 codes and runs terrible. Swapped coils and issue did not follow said coil.
Had a P59 sitting around and swapped it in the car. Different tune, car starts and runs, not great but better than 411 pcm and no codes.
Question is...
Is it the 411 pcm or the tune?
Not going to re pin again for the P59.

Thanks in advance

It's very difficult to say for sure here based on just this. Something could be amiss due to some issue with a(n unproven) segment swap or other goof that eludes the editor/definition, or you could have a driver (hardware) issue.

The green connector port on my lab rat P59 won't allow it to mate with my 0411 or 896 PCM style of wiring harness. How did you manage to get a P59 to lash up with an older P01 style of wiring harness?

Rick

You can swap the end combs for red and they will go. They are almost the same, wiring wise... just a few ground differences.

[B52bombardier1]

Hello,

Swapping the end pieces?? I had no idea. Thank you and I learned something today.

Rick