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Where is it? Engine Coolant Temp Sensor 200

posted by  oscarcat on  Sun Jul 30 11:40 CST 2006
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last visit: Sat Jan 28 19:31 CST 2012
[RELATED]

Finally getting around to tracking down the rough idle. Initially it was most noticeable when at operating temp, now it seems to also occur when cold. Engine performs well/smoothly in all other respects. Where is the engine coolant temp sensor located on a 1988 245A and what does it look like?








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    Where is it? Engine Coolant Temp Sensor 200

    posted by  oscarcat on  Sun Jul 30 12:26 CST 2006
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    last visit: Sat Jan 28 19:31 CST 2012
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    More symptoms: I drove it 10 miles at freeway speeds before the temp guage reached the mid point/operating temp. Once it was at operating temp it seemed to have more pep, something I hadn't noticed before. Now I suspect it is running too rich. In addition to the engine coolant temp sensor, where to look? It is something simple, I just know it is.








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      Where is it? Engine Coolant Temp Sensor 200

      posted by  pageda on  Sun Jul 30 14:11 CST 2006
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      last visit: Fri Oct 24 13:18 CST 2014
      [RELATED]

      You might want to replace the thermostat as a first attemp at solving this problem. The ECU Temp sensor is under the #3 cylinder intake manifold runner. Not easy to get at or even see.

      Do the spark plugs look like it is running rich?
      Dan








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        Where is it? Engine Coolant Temp Sensor 200

        posted by  oscarcat on  Sun Jul 30 16:38 CST 2006
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        last visit: Sat Jan 28 19:31 CST 2012
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        Spark Plugs: Ahhhh, good thought to check for rich mixture, I will pull one. Also, thermostats/gasket are relatively inexpensive and easy to install and I don't think I ever replaced this one so will do that as part of preventive maintenance. Thx for both suggestions.








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          Where is it? Engine Coolant Temp Sensor 200

          posted by  B.C. on  Mon Jul 31 05:42 CST 2006
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          last visit: Wed Mar 28 22:28 CST 2012
          [RELATED]

          The ECT is almost the engine bay version of the heater blower motor.

          When the one on my 1988 244 needed changing, I combined the job with a throttle body cleaning and oil separator box replacement.

          Once the throttle body and oil separator box are removed, you can see the ECT.

          It is not necessary to drain off any coolant for this job.

          Remove the harness, same wire clip system as injector connection. Loosen the ECT just enough to get it free, then tighten finger-tight.

          Not wanting to get any coolant into the crankcase through the holes that get revealed when the oil separator box is off, I laid over them a paper towel folded to be thick and narrow so it would sit there.

          Next, with your hands, take out the old ECT and spin in the new one. A little coolant will drip out, not enough to worry about. Tighten and then go on with the job.

          Good Luck,

          Bob

          :>)






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