Well the air injection could be the air pump not working or any part of the emmission not working.
Yes the ect sensor should be replaced but won't stop the overheat.
You say the waterpump is ok? Do you have good circulation at idle?
Normally this prob is a restriction in the cooling system, the coolant is not circulating through the water jackets in the engine or the radiator. Why not remove the thermostat see how it cools with no stat at all?
Tuesday, July 28th, 2020 AT 10:59 AM