1997 Deville looking for the ECT sensor
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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, 1997 Deville looking for the ECT sensor in Past Cadillac Vehicle Discussion; I need help locating my ECT sensor. I have a FSM and it shows me right where it should be. ...
  1. #1
    kshanok is offline Cadillac Owners Member
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    1997 Deville looking for the ECT sensor

    I need help locating my ECT sensor. I have a FSM and it shows me right where it should be. Instead of the sensor there is a threaded plug. I know the engine has been out of the vehicle and may have been replaced with a salvage engine. Is there another place for the sensor, maybe another year??

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    Ranger's Avatar
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    Re: 1997 Deville looking for the ECT sensor

    They're all in the same place. Why are you looking for it?

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    kshanok is offline Cadillac Owners Member
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    Re: 1997 Deville looking for the ECT sensor

    I'm looking for it to test it. I am still chasing down a rich condition at start up. I can clearly see where the sensor should be by looking at my FSM. It is a factory threaded plug. My source says the rear cylinder head driver's end and down near the bottom of the bracket used to pull the engine.

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    Re: 1997 Deville looking for the ECT sensor

    Yup, that's where it should be. I suspect someone removed it and plugged the hole. That may be your problem.

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    Re: 1997 Deville looking for the ECT sensor

    There should be a connector roaming around somewhere if the ECT isn't installed

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    kshanok is offline Cadillac Owners Member
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    Re: 1997 Deville looking for the ECT sensor

    Okay. If a sensor is unplugged, doesn't it throw a code?

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    Ranger's Avatar
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    Re: 1997 Deville looking for the ECT sensor

    Yes, I would expect to see something in the P0115-P0119 range, but if it ain't there, what else can it be?

  9. #8
    kshanok is offline Cadillac Owners Member
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    Re: 1997 Deville looking for the ECT sensor

    Well, Ranger. I would bet this engine would not run well without the ECT and after it runs like crap for a few seconds it runs like new until you shut it off and wait awhile. The one fuel injector that I took out was as clean as new on the end where there should have been some deposits. I mean it looked as good as the new one. I don't know what any of this means except the fuel system is clean.

  10. #9
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    Unless someone installed resistors in place of the sensor, you wouldn't have any apparent problems. The PCM relies on other sensors to calculate fuel requirements.

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    Re: 1997 Deville looking for the ECT sensor

    All I can say is there should be an ECT sensor and there ain't. I would get one and install it and go from there. No ECT sensor has got to be wreaking havoc with the PCM.

  12. #11
    kshanok is offline Cadillac Owners Member
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    Re: 1997 Deville looking for the ECT sensor

    Does the ECT sensor also control the temperature gauge? I have the digital dash and the temperature is always there.

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    MoistCabbage's Avatar
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    Yes. There is only 1 ECT sensor in Northstars. Some vehicles use 2, or even 3 separate sensors (gauge, fans, PCM).

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    kshanok is offline Cadillac Owners Member
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    Re: 1997 Deville looking for the ECT sensor

    Okay. I believe I have found my ECT sensor. It took a strong light and a mirror. The next question is how do I get to it. I can barely put a finger on it.

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    Remove whatever you need to be able to fit your hand and a tool in there.

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