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Persistent Code 21 ECT Sensor Issue

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    Persistent Code 21 ECT Sensor Issue

    i have had this code for awhile now and its still will not go away. i have replaced the cooling system parts recently have new hoses new rad new rad cap new thermostat, new water pump and new fan clutch. problem is at operating temp code 21 still is on. now just did some tests i have replaced the ect sensor and this code is still present. i have a full rad of coolant and had the car running at op temp i noticed something though the upper rad hose gets hot but it doesnt feel pressurized i can press the hose in also at op temp the lower rad hose isnt hot at all. did my new rad cap fail, is there a block in the new rad i dont know. i ran the test on the ect sensor on a scale of 200k which is 200,000 ohms i checked resistence between the two probes on the sensor and got both with engine running and engine off 03.4 ohms what does this mean. i really would like to solve this code 21 cause its fucking up my fuel mixture badly.

    1982 Lincoln Continental Mark VI Bill Blass Designer Series 2-Door(Larisa)
    -Mods: HO Roller 302, GT40P Heads, Explorer Intakes, HO ECM(D9S), Autodimming w/compass and outside temp rearview mirror, Daniel Stern Lighting Mod, Dual Exhaust, 90's GM C/K Series Retractable Hood Light, Red Digital Dash Display, 92-94 White Leather Town Car Signature Cupholder Armrests, HPP Wheels, Police PS Cooler, Police Trans Cooler. More to come!!!!
    1998 Ford Explorer Limited 5.0 AWD(Fiona)-Mods: Lincoln Navigator THX Audio System, Ford Explorer Sport Instrument Cluster.

    #2
    after the car was ran for awhile at operating temp i shut the car off and loosened the rad cap no pressure was released as no coolant overflowed out of it. this is really bugging me.

    1982 Lincoln Continental Mark VI Bill Blass Designer Series 2-Door(Larisa)
    -Mods: HO Roller 302, GT40P Heads, Explorer Intakes, HO ECM(D9S), Autodimming w/compass and outside temp rearview mirror, Daniel Stern Lighting Mod, Dual Exhaust, 90's GM C/K Series Retractable Hood Light, Red Digital Dash Display, 92-94 White Leather Town Car Signature Cupholder Armrests, HPP Wheels, Police PS Cooler, Police Trans Cooler. More to come!!!!
    1998 Ford Explorer Limited 5.0 AWD(Fiona)-Mods: Lincoln Navigator THX Audio System, Ford Explorer Sport Instrument Cluster.

    Comment


      #3
      Originally posted by MattsTownCarSS View Post
      after the car was ran for awhile at operating temp i shut the car off and loosened the rad cap no pressure was released as no coolant overflowed out of it. this is really bugging me.

      code is gone for now. must have had air in the system and my overflow bottle was empty filled it up now. will recheck codes tommorow.

      1982 Lincoln Continental Mark VI Bill Blass Designer Series 2-Door(Larisa)
      -Mods: HO Roller 302, GT40P Heads, Explorer Intakes, HO ECM(D9S), Autodimming w/compass and outside temp rearview mirror, Daniel Stern Lighting Mod, Dual Exhaust, 90's GM C/K Series Retractable Hood Light, Red Digital Dash Display, 92-94 White Leather Town Car Signature Cupholder Armrests, HPP Wheels, Police PS Cooler, Police Trans Cooler. More to come!!!!
      1998 Ford Explorer Limited 5.0 AWD(Fiona)-Mods: Lincoln Navigator THX Audio System, Ford Explorer Sport Instrument Cluster.

      Comment


        #4
        If its not making pressure, either there is air in there or its not warming up.
        86 Lincoln Town Car (Galactica).
        5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley

        91 Lincoln Mark VII LSC grandpa spec white and cranberry

        1984 Lincoln Continental TurboDiesel - rolls coal

        Originally posted by phayzer5
        I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers

        Comment


          #5
          air
          sigpic


          - 1990 Ford LTD Crown Victoria P72 - the street boat - 5.0 liter EFI - Ported HO intake/TB, 90 TC shroud/overflow, Aero airbox/zip tube, Cobra camshaft, 19lb injectors, dual exhaust w/ Magnaflows, Cat/Smog & AC delete, 3G alternator, MOOG chassis parts & KYB cop shocks, 215/70r/15s on 95-97 Merc rims

          - 2007 Ford Escape XLT - soccer mom lifted station wagon - 3.0 Duratec, auto, rear converter delete w/ Magnaflow dual exhaust

          - 2008 Mercury Grand Marquis Ultimate Edition - Daily driver - 4.6 2 valve Mod motor, 4R75E, 2.73s. Bone stock

          Comment


            #6
            Originally posted by 1990LTD View Post
            air
            it had to be air since i had no coolant in my overflow bottle for months so it probably sucked air instead seems fine now.

            1982 Lincoln Continental Mark VI Bill Blass Designer Series 2-Door(Larisa)
            -Mods: HO Roller 302, GT40P Heads, Explorer Intakes, HO ECM(D9S), Autodimming w/compass and outside temp rearview mirror, Daniel Stern Lighting Mod, Dual Exhaust, 90's GM C/K Series Retractable Hood Light, Red Digital Dash Display, 92-94 White Leather Town Car Signature Cupholder Armrests, HPP Wheels, Police PS Cooler, Police Trans Cooler. More to come!!!!
            1998 Ford Explorer Limited 5.0 AWD(Fiona)-Mods: Lincoln Navigator THX Audio System, Ford Explorer Sport Instrument Cluster.

            Comment

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