kristov

I just swapped my used LS1 long block with a new crate engine. The PCM will be re-used from the old engine.

Do I need to do some kind of calibration of the PCM to adapt it to the new long block?

Both long blocks are stock engines.

LSX Power Tuning

iTrader: (4)

If your just putting a new version in of what you had then a tune isnt needed.

kristov

I am using the same PCM with the same tune.

I re-used all the electrics and sensors from the old engine. The only new sensors are the Cam- and Crankshaftsensors as they were already installed on the new engine.

mrvedit

You should be good to go.
Worst case, you might have to have a "Crank relearn" performed which synchronizes the signals from the Crank and Cam sensors. Any good GM shop can do that in a few minutes.

kristov

Could the lacking Crank relearn cause the issue below?`

"If I put both hands on the intake manifold I can feel irregular skips/misses. The engine runs fine for a while and then a skip/miss. After this it continues to run fine before another skip/miss and so it continues. The skip/miss is just very slight, like when a heart skips/jumps over a beat. I can also barely hear it in the tailpipe."