miracerros@comcast.net
| Once every drive cycle the Mustang computer monitors the engine coolant temperature to verify proper thermostat operation and confirm that the engine is generating sufficient heat. A timer is started when the engine reaches a moderate load and the vehicle is moving at least 15 mph. If the timer exceeds the target time and the engine has not warmed up to the target temperature, the P0125 (Insufficient Coolant Temperature For Closed Loop Fuel Control) malfunction indicator lamp (MIL) will be triggered: It may also trigger P1116 (Engine Coolant Temperature Sensor out of Self Test Range). |
| The target temperature for these MILs is ~175º (the stock thermostat regulating temperature minus 20º). A 180º thermostat is not likely to trigger these MILs. On a cold day, a 160º thermostat probably will. |
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Then how do people with highly modified cars avoid throwing MILs when they use a 160º thermostat?
I don't know. But I'll guess it's because most blown/boosted cars routinely exceed 175º during their warm-up, and that they also
use an aftermarket computer chip that changes the temperature triggers that are built into a stock chip.
miracerros@comcast.net
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