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  • Question : 3100 Running Temp?

    So i swapped TB on my 3100 to a 3400 and since i was there and i had gotten a code for it i swapped the ect sensor mainly because it was easier to get to with the TB off, so i put the new sensor and TB on, start it up. Runs fine no problems.
    While im on my way home i notice that the temp gauge on the dash is reading higher then normal, so why first thought was that i put air in the cooling system. so i bleed the system, pull it under a vacuum(holds fine no leaks). Run the car again, same problem so i put the old ect back in and now its reading normal.
    I hooked my scanner up and was watching what the computer says the temp is and compared to the gauge on the dash, there no where close

    So my questions are-
    Is what i think normal really wrong because the sensor is bad, and it really runs that hot?

    Which reading is right and witch is wrong?



    Thanks

  • #2
    Mine runs between 195-210 F on any given day depending on the type of driving

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    • #3
      thats about what the computer says, but the gauge is closer to 180-190

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      • #4
        The gauges are not accurate due to consumer issues. I dont remember much but I do remember the temp gauges in the cluster was purposely designed to read cooler then what the real temp is. I think it was because people took their cars in when they appeared to run hot, but it was just normal operation.

        I also learned these engines, among others, run better and/or more efficient around 210*F versus 195*F as per thermostat.

        I wouldn't worry about it until it passes 225-230 degrees F, imho
        Last edited by TGP37; 01-25-2012, 06:45 PM.
        1996 Grand Prix | 3100v6 L82 | T04E-50 Turbo | Getrag 282 w/ EP LSD | SPEC-3 Clutch

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        • #5
          alright thanks,
          ill just put the new sensor back in and be done with it

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          • #6
            Originally posted by TGP37 View Post
            The gauges are not accurate due to consumer issues. I dont remember much but I do remember the temp gauges in the cluster was purposely designed to read cooler then what the real temp is. I think it was because people took their cars in when they appeared to run hot, but it was just normal operation.

            I also learned these engines, among others, run better and/or more efficient around 210*F versus 195*F as per thermostat.

            I wouldn't worry about it until it passes 225-230 degrees F, imho

            Interesting. My gauge reads real low, dunno if it's accurate. The fan doesn't come on until around 110*C. Normal operating temp is between 50 and 60*C according to the gauge but I've used an IR thermometer and the thermostat opens when it should.

            However I believe there's something amiss with the sensor or wiring because even in the dead of winter it reads slightly higher than 40* (the lowest number on the Celsius gauges) and will start moving once it passes that temp, but since it's reading low it doesn't go much higher unless I'm idling and I let it get warm enough for the fan to turn on.

            I think it's just a really fancy idiot light.

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            • #7
              thats what mine was doing for years, then it throws a code telling me replace the sensor.
              replaced with a new one and now it reads really high(compared to the way its read for like 5 years)

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              • #8
                Originally posted by Dpzelenak View Post
                thats what mine was doing for years, then it throws a code telling me replace the sensor.
                replaced with a new one and now it reads really high(compared to the way its read for like 5 years)
                If it reads hotter the PCM will act on the temp either way. That just may be added resistance in the circuit as the temp sensor works on resistance. Or maybe a pcm ground is going bad, failing grounds cause all kinds of wierd issues.
                1996 Grand Prix | 3100v6 L82 | T04E-50 Turbo | Getrag 282 w/ EP LSD | SPEC-3 Clutch

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