For the first 10 years it was not driven like maybe at max 50,000 kms and was serviced from Toyota 3s but after that it was driven much more but I was not involved in maintainence as I was not interested at that time so don't know how it is maintained. The body still looks very good but the engine...
As it was run with water which may have caused rust inside the block and the thermostat area is rusted also and leaking aswell.
Else there was no other issue like idling or any sensor fault. Even the transmission was running perfect. Acceleration is fine. No missing.
But as you see price for 1zz and 3zz has not much difference with 1nz complete setup so I went with this as we don't have any plans to sell this car. So I think in long term 1nz setup will serve better than 1zz/3zz swap.