Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Inlet Air Temperature (IAT) Sensor
The inlet air temperature sensor is similar in construction to the coolant temperature sensor. Sensor is mounted in the air cleaner body, near inlet duct. See Figure. As air temperature rises, the resistance of the sensing thermistor decreases.
The ECA applies a 9-volt reference voltage to sensor and monitors the resultant voltage drop across sensor. By this method, the ECA can determine proper spark advance and Thermactor air injection flow. At high inlet temperatures (above 90°F), the ECA will modify timing advance as necessary to prevent spark knock.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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