Smoking motor is not good.
AG pumps are designed to run with the pool water higher up so there is gravity pressure. An IG pump is able to pump from the surface and pump the water up.

Further, most AG pumps are "up-rated" while IG pumps tend to be "full-rated". To super-simplify, it means that an AG pump rated at 1.5HP may have the same flow rate as a 3/4HP IP pump.

Re-read mas985's post above.