1996 Mercury Sable car idleing to fast

1996 MERCURY SABLE
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ANGEL_GIRL
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Engine Performance problem
1996 Mercury Sable V8 Front Wheel Drive Automatic

My car keeps idling fast, We changed the camshaft part and sensor. It did not fix it. The meter reads it as code PO125 Insufficient Coolant Temperature for closed Loop Fuel Control. What does that mean. Please help.
Feb 25, 2009 at 3:27 PM
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JGAROFALO
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This points to either a bad thermostat or coolant temperature sensor.

If the thermostat is not functioning properly, the engine does not reach proper operating temperature, and causes the code.

If the thermostat is operating correctly, but the sensor is bad, the computer THINKS that the engine has not reached proper operating temperature and generates the code.

Start be checking coolant temperature when the engine is running by maikng the following checks: The gauge should read within the brackets, with center of gauge the preferred reading. Heater should be operating at normal efficiency - good and hot, not lukewarm. Feel the radiator hoses - CAREFULLY!! They should be uncomfortably hot. These checks should give a good indication of whether the engine is reaching proper temperature.

If the engine is up to temperature, then the coolant temperature sensor would be the probable cause of the problem.

Hope this is of some help.
Mar 13, 2009 at 5:07 PM
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