Temperature Sensors

The temperature of the intake air and the engine coolant are constantly monitored. This information is fed directly to the ECU. The air temperature sensor has very little effect on injection duration. Because of this, the air temperature sensor should be considered a fine-tuning device.

The air temperature signal modifies the manifold pressure signal to indicate the weight (density) of the air in the intake system. This helps the control unit maintain the most efficient air/fuel ratio.

The coolant temperature sensor has greater direct control on engine operation, although its primary function is to aid in engine warm-up. This sensor combines with the cold start system and the auxiliary air valve to form the equivalent of the carburetor's automatic choke.