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your thermostat is most likely stuck open. replace it ,,before ol' man winter comes!
my 1997 with the 2.0 mpfi tops out at 138 on flat ground. exhaust mod and cold air intake. nothing else.
check the heater core
It is possible that a 1993 Toyota will not start when it is cold because the battery does not have enough cranking amps to start the vehicle. Check to make sure that the battery is large enough for the job and is also charging properly.
It is most likely the starter getting weak, when a weak starter is cold, it will not crank.
There is a high pressure fuel line under the throttle body that carries fuel to the cold start injector. There is a black pipe that feeds idle air to the same spot to insure the cold start injector gets a good mixture.
Check your battery first.. If it is fine, you might need to replace your cold start injector timing switch. Fairly expensive, but should work.
Morris Has a Cold - 1993 was released on: USA: 1993
This engine will have seven injectors. 6 are the running injectors and there is a "Cold Start" injector.
Pole to Pole - 1992 Cold Start 1-1 was released on: UK: 21 October 1992 USA: 10 January 1993
i would drain the radiator and put fresh antifreeze in it