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Intake manifold temperature sensor in GMC Envoy is responsible for measuring temperature of the airflow in order to maintain efficiency of the engine. All this information is sent to the Powertrain Control Module (PCM) which in turn changes the fuel injector timing so as to enable the correct air/fuel mixture for combustion. Various sensors could have been used in the different Envoy models depending on the model and one common sensor was the Mass Air Flow (MAF) sensor. The calibration of the MAF sensor is adjusted to a particular settings of air flow rates and fuel injectors so that things like performance air intake systems can be installed without requiring the use of a new sensor. However, increased air flows as provided by intake and exhaust modifications may overwhelm this sensor and lead to problems in flow performance. In summary, the Intake Manifold Temperature Sensor is an important component that determines whether the air and fuel are in a correct proportion that determines the efficiency of the engine and its overall performance.