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Coolant guage/temp issue

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  • #16
    Originally posted by BrApple View Post

    That is true. However I hope by stating OBDII I was being clear on that.
    umh, I don't recall saying that you weren't clear. I was adding a "data point" in case an OBD1 owner say these posts and wondered if they had a logger.

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    • #17
      Just resurrecting this old thread, I was just datalogging and my cooling fans kick on low speed around 216-218F. They turn off at 204F. The temperature gauge on the dash gets to just under the high line when at 216F, and is half way when at 204F. I'd like the gauge to be a little less sensitive when everything is working well, I might look into a new OEM temp sender for the dash gauge...
      2k SVTC - Black / Praire Tan, blu_fuz ported 3.0L, 58k motor, 118k chassis

      http://www.contour.org/ceg-vb/attach...chmentid=16333

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      • #18
        OK, a new motorcraft sender behaves the same way (wasted $15 bucks), and it seems to be a common problem as I search. The thermistor resistance drops as the temps increase, so I'm going to wire in a resistor (not sure of the ohms needed yet) and drive the gauge back to the middle of the sweep when hot.
        2k SVTC - Black / Praire Tan, blu_fuz ported 3.0L, 58k motor, 118k chassis

        http://www.contour.org/ceg-vb/attach...chmentid=16333

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        • #19
          Added a 40 ohm resistor in series with the sender. Brings the gauge down to mid way when the fans kick on at 216F. Just to be clear, this does not mess with the ECT sensor. Just the stupid factory engine temp gauge...

          I found a chart that is close to the readings I measured off the factory sender:

          2k SVTC - Black / Praire Tan, blu_fuz ported 3.0L, 58k motor, 118k chassis

          http://www.contour.org/ceg-vb/attach...chmentid=16333

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          • #20
            Pics?
            98 Silver Frost
            Full 3.0L
            ST220 intake w/ f150 tb

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            • #21
              Here are a few pics, first the sender in question (right under the throttle body):


              The resistor wired in series to increase the resistance seen by the gauge by +40 ohms (already wrapped in heat shrink):


              And the wiring diagram page explaining what I did:


              Hope this helps others!
              2k SVTC - Black / Praire Tan, blu_fuz ported 3.0L, 58k motor, 118k chassis

              http://www.contour.org/ceg-vb/attach...chmentid=16333

              Comment

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