Need help with wires on my 92 SL1

Discussion in 'Saturn S-series' started by MARK, Apr 15, 2006.

  1. MARK

    MARK Guest

    On the back of the engine on my 92 SL1 ,right above where the tranny bolts
    to,the are 2 sensors of some kind.
    One has 2 wires going to it(one of them yellow) and the other has just 1.
    Which one has the 2 wires going to it?.... thanks for your help?(what are
    these 2 sensors anyway?)..........Mark
    MARK, Apr 15, 2006
  2. MARK

    blah blah Guest

    Sensor with Yellow and Grey wires, Engine Coolant Temp Sensor.
    Single Wire, being a 92', is probaby the sensor for the ECT Gage.
    blah blah, Apr 15, 2006
  3. MARK

    wavy Guest

    Top sensor with one wire - your gauge indicator that essentially
    measures engine head temperature.
    The bottom sensor - a VERY important issue! It is the computer's
    engine coolant temperature sensor. Its the one with two wires. THIS
    item only costs about $9 at AutoZone, but IT is responsible for half of
    the Saturns you'd see in the junkyard.
    This sensor goes bad, then the engine computer runs too rich, the fan
    motor won't switch on and the car develops chronic overheating problems
    (because the computer thinks the engine is very cold WHEN it's very
    When this sensor goes bad, the car will not pass an emissions test and
    will idle at about 1200 while stopped and 1700 rpm while car is moving.
    At about 60degrees w/engine cold, the sensor should measure about 4k
    ohms resistance. At 200degrees (engine hot) the sensor measures about
    100 ohms.
    Its hard to check this sensor while its in the engine... I made my own
    connector from a cable harness from a dead tv set (little inline plug
    I just bought my second SC2. I got a GREAT deal on it was because the
    original owner's "shade tree" mechanic didnt know what was going on
    with it. As I'd had experience with this sensor problem with my first
    Saturn - I realized when I test-drove it exactly what was going on!
    This applies to SC and SL Saturns from 91 to at least 96.
    wavy, Apr 17, 2006
  4. MARK

    MARK Guest

    Thank you very much.That did alot to clear things up....I owe ya one... Mark
    MARK, Apr 18, 2006
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