What occurs if an engine has a rich condition due to high IAT voltage?

When an engine experiences a rich condition due to high Intake Air Temperature (IAT) voltage, it means that the engine control module (ECM) is interpreting that there is more air entering the engine than there actually is, which leads to the system injecting more fuel than necessary. This imbalance in the air-fuel mixture results in incomplete combustion, producing excessive fuel consumption and emissions, as well as reduced engine power.

The richness of the mixture makes it less efficient at producing power since the combustion process does not use the fuel optimally. With too much fuel and not enough air, engine performance suffers—specifically in terms of horsepower and torque. Therefore, the likely consequence of this rich condition due to inaccurate IAT signals is a decrease in engine power.

While rich conditions can sometimes improve throttle response temporarily by providing more immediate power under certain conditions, the overall impact of prolonged rich mixtures leads to inefficiency and power loss, supporting the answer that decreased engine power is the correct outcome when faced with this scenario.