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Will not start when temperature drops 15 degrees

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Old Aug 27, 2012 | 06:28 PM
  #1  
mercuryguy's Avatar
mercuryguy
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Will not start when temperature drops 15 degrees

I have a 1997 Mercury Mountaineer AWD 5.0. When the temperature drops 15 degrees or so overnight it will not start. When it does start, after the temperature rises and the engine is warmed up it will start all day and it runs and drives perfectly.

Any suggestions greatly appreciated.
 
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Old Aug 27, 2012 | 06:39 PM
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aquanaut20
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Connect a "LIVE DATA SCANNER" and check the ECT when cold, it should be the same as the AIT......

This is the sensor that initiates rich mode for cold start..... Philip
 
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Old Aug 27, 2012 | 06:45 PM
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Thanks for answering. Let me make sure that I understand you. Check the Engine Coolant Temperature sender and it should be the same as ambient air temparature?

I am not sure of what a live data scanner is.
 
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Old Aug 27, 2012 | 07:11 PM
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aquanaut20
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LDS is an instrument that reads the data to/from the PCM/ECU and sensors, in real time (note, not a code reader)

There are 2 temperature probes, one for the computer the other for the instrument panel, they are not interchangeable..... Philip
 
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