SOURCE: Coolant Temp Sensor 03 Malibu
coolant sensor maybe 19 mm key its near the upper radiator hose in the engine thanks pierre
SOURCE: coolant fan temp sensor location on a 2003 chevy venture
located in thermostat housing or in intake nearby (where top hose connects from radiator to engine)
SOURCE: 91 chevy 4.3 v-6 runs extremely rich when engine
DTC - 13
Oxygen sensor circuit open or no activity
DTC - 33
MAP sensor circuit error (signal high indicating low vacuum)
DTC - 54
Fuel pump circuit low voltage
Start with checking the wire leads to the O2 sensors and MAP sensor. Look for any damages to the wire harness and replace any parts damaged or faulty.
The O2 and MAP sensor take reading and sends it to the ECM to recalibrate the fuel injector pulse to adjust the amount of fuel entering the cylinders. When there is an issue to the O2 sensor or MAP sensor and even both, the ECM will be set a a factory default to run rich to keep the engine running and at times the engine may not even run. Normal fuel to air ratio is 14.7:1 - 14.7 air to 1 parts fuel and at default it could be as high as 12.5:1. Good luck and keep me posted, be glad to help you get your truck running 100% again soon and please rate. replacing the thermostat and temperature sensor would also be a good thing since the 4.3 runs best at 190".
SOURCE: what are the symptoms if my car has a bad engine
More specifically you will have trouble starting the car. When the ECTS is bad the PCM reads it that the engine is at -40F. This means that it will dump tons of fuel into the engine in order to warm it up. You may also experience rough idling due to the rich fuel mixture and black smoke from the exhaust (which is an indication of running rich, burnt fuel).
SOURCE: 2006 chevy impala coolant temp sensor
The coolant temp sensor located ( below the thermostat housing in the intake manifold )
hope this can help. good luck
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