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Bad ECT Sensor? 900 1996

uid 25346's pic
posted by  GT144 on  Mon Apr 25 04:45 CST 2011
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last visit: Fri Oct 24 04:32 CST 2014
[RELATED]

I got my car back from the shop after a complete rebuild, and it runs very well now. However, after some miles of driving, the Check Engine light lit up. Together with the light, other syptoms include the radiator fan turning on full speed a few seconds after startup, and it stays on for about 5-7 mins after shut down. Also, start up when engine is cold is rough, and takes 10-15 seconds to smoothen out, almost as if mixture is not rich enough for cold starts. Car starts up and runs perfectly well when warm.

My guess is that the ECT sensor is bad and is sending a signal to the ECU that the engine is hot, hence the poor start up on cold, and overzealous radiator fan.

Am I correct? Thanks guys.
--
...and the bricks keep on rolling








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    ANSWER Bad ECT Sensor? 900 1996

    uid 11021's pic
    posted by  dewfpo on  Mon Apr 25 17:57 CST 2011
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    last visit: Thu Oct 23 18:34 CST 2014
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    I would first check the wires to the sensor. Since it's a new problem, chances are a wire is broken or grounded.

    DEWFPO
    --
    1998 S90 083,228 and 1995 964 154,100

    This post has been marked as an answer to the original question.



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      Bad ECT Sensor? 900 1996

      uid 25346's pic
      posted by  GT144 on  Sat Apr 30 03:27 CST 2011
      Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
      last visit: Fri Oct 24 04:32 CST 2014
      [RELATED]

      Bingo! the connector was bad, and I replaced with one from a parts car. Now the cold start up is fine, the fan cycles on and off as it should, and the check engine light is off.

      THe computer was giving out Code 123 - no signal/faulty ECT.

      Thank you DEWFPO.
      --
      ...and the bricks keep on rolling







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