if the smoke is always happening, then the rings are shot on the pistons.
The oil scraper rings are probably shot and the compression is low which will
give you lose in power most definetely. To determine which cylinders are
affected, just pull the plugs out and see which has the oil on the electrode.
If all the plugs are fouled with oil, then the car should be hard to start.
Is the car hard to start? I feel that since you are losing power bad, then
the compression is lost and that is the piston rings mostly. The valve seals
going bad would indicate either slight burning when the car is warmed up and
you get that puff after stopping at a light and it quits.
If you are going to find out the problem, best to just rebuild the
existing motor with new pistons and rings and have the block bored machined
to get the groves out.
I suspect the oil was not changed regularly if all the plugs are
fouled. That would indicate that the particles were working into the
cylinders and causing wear inthe sleaves and the rings and pistons. I bet if
you pull the motor apart, you will see vertical grooves in the block cylinder
walls and on the pistons.
Chris 92 classic
PS, If you need any more info, my uncle is a Nissan master tech
and we work on mine alot, so any questions just ask.
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