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.
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HOMESERVICE MANUALSFORD1990RANGER 4WD L4-140 2.3L SOHCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSAIR TEMPERATURE SENSOR ( AMBIENT / INTAKE )DESCRIPTION AND OPERATION
1990 Ford Ranger 4WD L4-140 2.3L SOHC
Air Temperature Sensor ( Ambient / Intake ): Description and Operation
1990 Ford Ranger 4WD L4-140 2.3L SOHCSECTION Description and Operation
Fig. 2 Air charge temperature (ACT) sensor:
This sensor, Fig. 2, provides the EFI system with air/fuel mixture temperature information. The air charge temperature sensor is used both as a density corrector to air flow calculation and to proportion the cold enrichment fuel flow. This sensor is similar in construction to the engine coolant temperature sensor and is mounted on an intake manifold runner or on the air cleaner.
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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.