YOU WILL LOT OF FUEL CONSUMPTION. A OPEN OR MISSING THERMOSTAT WILL CAUSE VECHICLE STAY IN OPEN LOOP.ENGINE WILL BURN RICH BURN MORE FUEL.YOUR THERMOSTAT ALLOWS COOLANT TEMPERATURE TO GET AT A SET POINT WHERE ECM OR PCM ADJUST FUEL SYSTEM FROM OPEN LOOP RICH MIXTURE FOR COLD ENGINE TO CLOSED LOOP TO LEAN OUT FUEL SYSTEM AS ENGINE COOLANT TEMPERATURE GET HOT.YOU NEED TO REPLACE THERMOSTAT.OPEN THERMOSTAT WILL CAUSE NO HEAT PROBLEMS ALSO.
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