Did it overheat?
Engines do not overheat on their own. Normally when an engine overheats, it’s due to one of the items that are in place to keep it FROM OVERHEATING. These are some of the common failure points:
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★Thermostat = sticking open or closed, aftermarket thermostat, incorrect heat range.
A properly working thermostat is arguably one of the most important pieces of a cooling system, and
also one of the key components to tell your EFI computer or carb VSV sensors to control the delivery
of fuel and timing control. Toyota designed their thermostats to control the temperature of the
coolant to make their engines perform at their peak depending on the temperature. AFTERMARKET
thermostats are made by FLANGE size (big enough to fit into the t-stat housing) and use a universal
size thermostatic wax plunger not designed for your 22R/RE.
If the thermostat opens too soon, the coolant is too cold (and doesn’t have a chance to get to normal
operating temp) the computer will richen the fuel mixture causing poor fuel economy and poor
performance. The computer thinks the engine is still in “cold, choke mode” (richening the mixture).
When we dyno tested out “baseline” truck, the dyno tech told us we could gain more horsepower by
‘leaning out the mixture’ (YES! too much fuel will cause a DECREASE in performance!). Stick with
an OEM thermostat. We’ll only sell OEM for a reason, and it’s not for profit! Well worth the extra
dollar or two.