Temp sensor help.

Discussion in 'Technical' started by ports, Mar 4, 2007.

  1. ports

    ports the pro

    Do temp sensors just fail without notice? I had my car running just fine with coolant
    temps reading 82 degrees through my microtech dash display. Turned it off and
    10 seconds later I fired it up again, only to have the idle screaming at 1650 rpm and
    the temp reading at -25 degrees!!!:eek: I'm assuming that the high idle has something
    to do with the ecu thinking that my temps are freezing? I have checked for corrosion
    and found nothing but clean fittings (sensor is newish). Is there a way to check the
    sensor, should I remove it and test with a naked flame? I have switched off the power
    but this dosn't seem to help. Any ideas would be most welcome.:cool:
     
  2. ross

    ross Member

    don't test it with a flame , just use boiling water
     
  3. ports

    ports the pro

    Just removed it and it is very hot to touch, standard pod gauge is at the centre,
    so temps must be up near 85 deg. Sh*t this is a pain as my car is going to the
    spray painters tomorrow, can I check with multi meter, and if so how?:cool:
     
  4. K-zed

    K-zed Secret Squirrel

    See tech A-Z/Cooling system.... article by Zed4life.
     
  5. ports

    ports the pro

    Cheers Rob.:cool:
    But I have a question, if the sensor is faulty, shouldn't the stock gauge read zero?
     
  6. pexzed

    pexzed Forum Administrator

    Stock Gauge and CTS use two different

    sensors.
    The Microtech and ECU read the CTS, and the Temp Gauge reads the other sensor.
    That's the two sensors on the top radiator hardpipe.
     
  7. jzack

    jzack Senior Mem - Foreign Div

    Could be a bad sensor harness connector ? - boots get brittle and crack over the years letting moisture get into the contacts and causing bad connections.
     
  8. ports

    ports the pro

    All fixed, a huge thank you to Ross for allowing me to test 4 different sensors
    and leading me to the right result.:cool:
     
  9. SIM300

    SIM300 FAKE MODERAT0R

    So what was it in the end?

    The sensor itself :confused:
     
  10. ports

    ports the pro

    Nope, not the sensor tested it on the multimeter and on one of Ross's zeds and it was
    fine. Tested the connector on the meter and was ok, then I bridged the fitting and
    got a zero read. Pulled back the sheath and found a lose wire (the return), so simple
    in the end which is a relief, as I was starting to panic.:cool:
     
  11. SIM300

    SIM300 FAKE MODERAT0R

    I see...

    That's what happened to me recently on the dyno, but it was a injector connector.
    It's good when you get to the bottom of it, specially when it's a easy fix ;)
     

Share This Page