Hello, I just did a motor swap in a 1988 chevy k2500 with the 5.7 liter engine. The motor swapped in is from a 1995 k3500 and is also a 5.7 liter. While looking at the data feed from tuner pro i noticed that the truck does not go into closed loop. There are no check engine lights on. What would cause the ecm not to run in closed loop?