Question about 1990 Chevrolet C1500

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I have a 1990 chevy cheyenne. The engine will turn over and start but i have to continue to play with the gas to keep it running. I cannot keep it running for long because it will die. It has a 4.3 V6 in it and is 2wd. I have a code reader for it and it shows code 15 which is "coolant temperature sensor fault - signal voltage high" What do you think is the problem and where is the coolant sensor and where can I test it at?

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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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SOURCE: no voltage at the engine coolant temperature

ever since 1995 you have to turn off useing a obd2 scanner, if you do not have one, you can go to any auto parts store and they will erase the code for free. by having the light still on the computer thinks it still has an error. good luck Toolman,

Posted on Jan 26, 2010

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SOURCE: engine coolant temperature sensor

it is on the left side cylinder head...about mid way...between number 2 and number 4 Ignition coils...but lower...below but not under valve cover.

Posted on Sep 21, 2010

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SOURCE: i have a 1990 chevy

starter jump from big termal to small one shood crank

Posted on Feb 04, 2011

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SOURCE: "1991 Chevy Cheyenne 4X4 K1500

The Engine Coolant Temperature (ECT) sensor is mounted in the intake manifold and sends engine temperature information to the ECM. The ECM supplies 5 volts to the coolant temperature sensor circuit. The sensor is a thermistor which changes internal resistance as temperature changes. When the sensor is cold (internal resistance high), the ECM monitors a high signal voltage which it interprets as a cold engine. As the sensor warms (internal resistance low), the ECM monitors a low signal voltage which it interprets as warm engine.


Fig. 1: Engine Coolant Temperature (ECT) sensor location-4.3L, 5.0L and 5.7L engines


  1. Remove the ECT sensor from the vehicle.
  2. Immerse the tip of the sensor in container of water.
  3. Connect a digital ohmmeter to the two terminals of the sensor.
  4. Using a calibrated thermometer, compare the resistance of the sensor to the temperature of the water. Refer to the engine coolant sensor temperature vs. resistance illustration.
  5. Repeat the test at two other temperature points, heating or cooling the water as necessary.
  6. If the sensor does not met specification shown in the temperature versus resistance chart, it must be replaced.
  7. The sensor may also be checked in the vehicle. Unplug the sensor and attach a digital ohmmeter to the two terminals of the sensor.
  8. Using a calibrated thermometer, compare the resistance of the sensor to the ambient air temperature.
  9. Repeat the test at two other temperature points, heating or cooling the water as necessary.
  10. If the sensor does not met specification shown in the temperature versus resistance chart, it must be replaced.

Fig. 3: The ECT sensor is usually located near the thermostat housing


Fig. : Engine Coolant Temperature (ECT) sensor wiring diagram


Fig. : Engine Coolant Temperature (ECT) sensor temperature vs. resistance values

Keep us updated.

Posted on May 28, 2011

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SOURCE: my 1990 chevy cheyenne pickup

Have you sprayed just a "touch" of starting fluid in the air ram, that takes the air to the throttle body. If you do that & it fires, you have a fuel delivery problem. If that fails, do you have spark?? That can easily be checked, by placing the "inductive arm"over any plug wire, attach to the battery & crank. DON'T worry about timeing, YET. If when the engine cranks, trigger pulled on the timing light & hthe light "flickers", your getting spark. The only thing left then, would be that you could have thrown a timing chain. Removing the oil fill cap, see if using a narrow light, if you can see a rocker arm/ Then have an assistant crank the motor, & see if they move. If that is in accessable, remove a valve cover, lay a towel, cloth over the top of the rockers that contact the push rods, (unless you like an oil bath,,,ha,ha) . But, seriously, then have an assistant crank the motor, NO MOTION= Thrown timing chain.

Posted on Sep 14, 2011

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