300 degrees...WTF | Ford Escort Owners Association (FEOA)
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300 degrees...WTF

Discussion in 'ZX2 1998-2004 2.0L DOHC' started by idontdriveanescort, Apr 7, 2010.

  1. idontdriveanescort

    idontdriveanescort New Member

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    Okay first of all, new member. Hi. Secondly, I do not own an escort.

    Okay then...Here's the story. My folks own a 2000 ford escort zx2, and they have had a weird issue regarding it. Below are its symptons:

    1. When using an OBD reader, it reads 300 degrees even when the car is 3 days cold.
    2.Temperature gauge itself did fluctuate.
    3. Fans stay on 24/7.
    4. Nearly impossible to crank now.
    5. When cranking after you just shut off the car, it will crank but will nearly redline at idle.

    They have tried replacing the instrument gauge wiring, the fan sensor, and the theromstat.

    I am not familiar with these cars, but is possible that the ECU table that reads the temperature is corrupted?

    I am leaning towards an ECU issue,so is it possible to reflash a stock calibration onto the ECU or will a new ECU need to be purchased?

    If it is not the ECU, then what could be causing this? Thanks in advance.

    Sorry for being one of those douchebags that logs on for one single question, and I know I will get flamed, atleast on my forum, I would if I did this as my first post, but I have exhasuted google.
  2. FordMan59

    FordMan59 FEOA Member

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    I had a similar issue with the idle on my '88 Escort several years ago and it was a bad ECU, but I'm not saying for sure that's your problem. Do you have any codes stored in the ECU that might help find the problem?
  3. juggalo

    juggalo New Member

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    i would say disconnect the coolant temperature sender. if the fans turn off, u found ur problem
  4. cklaubur

    cklaubur Former Escort Owner

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    Failsafe settings in the computer will command the fans on if there is no signal from the coolant temperature sensor.

    Disconnecting it should affect the reading on the scantool, however.

    Casey
  5. juggalo

    juggalo New Member

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    ^^didn't know that
  6. homestead367

    homestead367 New Member

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    It makes sense. Any time your car senses and issue. To hot or does not know, It will protect itself from harm. Its just like when your driving down the road and your pcv value goes bad. The engine detects the problem, knows it can run a specific way, so you can get home, even if its not as fast, or as efficiently.
  7. Hardline

    Hardline FEOA Member

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    that temperature usually indicates that there is a short on the coolant temp sensor circuit. If you unplug the sensor and open the datastream, the temp should read -40. if it does, it is a bat temp sensor, if it doesnt (still 300) there is a short in the wiring. My IAT did this when the insulation cracked off the wires and they touched.

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