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Can't find where the last harness plug connects

Discussion in '1st Gen. Tacomas (1995-2004)' started by Texincal, Jan 17, 2021.

  1. Jan 17, 2021 at 12:19 PM
    #1
    Texincal

    #1
    Texincal [OP] New Member

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    Morning y'all,
    So I did the my first head gasket in a 3rz and I can't find the receiving end of one of the wiring harness.
    Exhaust side , right below the heater core, a two pin connector that I've been looking for for two days now.
    16109145885446726134157007442210.jpg 1610914675959986537780231556435.jpg
     
    Texincal, Jan 17, 2021
    #1
  2. Jan 17, 2021 at 1:58 PM
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    billybop90

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    billybop90 Well-Known Member

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    goes to your coolant temp sensor on the back of your block towards the top. Pain to get to but doable.

    dfghdfg.jpg
    [​IMG]
     
    billybop90, Jan 17, 2021
    #2
    TnShooter likes this.
  3. Jan 17, 2021 at 2:28 PM
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    Texincal

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    Texincal [OP] New Member

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    Dude thanks your awesome! Apparently I broke the plastic clip off while pulling the head .. will that not being hooked up cause it not to start?
     
    Texincal, Jan 17, 2021
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  4. Jan 17, 2021 at 2:38 PM
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    billybop90

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    billybop90 Well-Known Member

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    Quite honestly I am not sure. I would not think it would effect the start up of the vehicle since everything is cold anyways but I am not 100% on that. I replaced my engine last year and broke that little bastard off whilst re-installing into the vehicle. I ended up buying a new one with an OEM unit and all was well.

    Better pic from bamatoy1997....
    [​IMG]
     
    billybop90, Jan 17, 2021
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  5. Jan 17, 2021 at 2:44 PM
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    billybop90

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    billybop90 Well-Known Member

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    billybop90, Jan 17, 2021
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  6. Jan 17, 2021 at 8:09 PM
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    Texincal

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    Texincal [OP] New Member

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    Update for those who may be curious. The coolant temp. Sensor has to be hooked up for the truck to start.
    I was almost convinced that the timing chain slipped off the bottom and skipped a tooth making it skip time. So I went back , checked and rechecked everything, all connectors and plugs , pulled the valve cover checked cam gear and timing marks , did a compression check and everything was all in line. So since I had the valve cover off I pulled the coolant temp sensor and sure enough I must have banged the head against the fire wall and broke the plastic off of it making it hard to find where the harness plugs in.
    So after installing a new one and buttoning everything back down she fired right up..
    And I only had one extra nut when it was all said and done.
    I think it came off the old exhaust manifold..
    Anyway, thanks for the insight and help.
     
    Texincal, Jan 17, 2021
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    Rachelsdaddy, SwampYota and 20tacoma17 like this.
  7. Jan 18, 2021 at 4:39 AM
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    Rachelsdaddy

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    Rachelsdaddy Well-Known Member

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    I had a nearly identical problem last week, I thought I miffed the timing, started throwing stuff. I overlooked the IAC plug :anonymous:
     
    Rachelsdaddy, Jan 18, 2021
    #7

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