1985-1993 Chevrolet Cavalier Intake Air Temperature Sensor Guide
If your Cavalier is experiencing poor performance or bad gas mileage, the intake air temperature sensor might be the reason.
- A bad IAT sensor on a 1985-1993 Cavalier will cause a Check Engine Light with OBD-I codes 23 or 25.
- Symptoms include rough idle, poor gas mileage, and hesitation.
- Replacement is very easy for a DIYer and can be done in minutes.
- A quality aftermarket brand like Standard Ignition is a reliable and cost-effective choice for this repair.
Symptoms of a Failing IAT Sensor in a 1985-1993 Cavalier
Since these second-generation Cavaliers use an OBD-I computer system, a failing IAT sensor will trigger the 'Check Engine' or 'Service Engine Soon' light. You can retrieve the diagnostic trouble codes by jumping the 'A' and 'B' terminals on the diagnostic port under the steering wheel with a paperclip and counting the flashes of the check engine light. 🎬 Watch this video to see how to jump the terminals. For the IAT sensor, look for Code 23 (indicating a low temperature reading) or Code 25 (indicating a high temperature reading).
Common performance issues include:
- Rough or Surging Idle: The engine may idle erratically, too high, or too low.
- Poor Fuel Economy: An incorrect temperature reading can cause the ECU to send too much fuel, wasting gas.
- Hesitation or Poor Acceleration: The car may feel sluggish or lack power because the air-fuel mixture is incorrect. 🎬 Learn more about common symptoms of a bad IAT sensor.
- Hard Starting: Especially in cold weather, the engine may be difficult to start if the ECU isn't enriching the fuel mixture properly.
Pro Tip: Check for Simple Fixes First
Sometimes, a trouble code can be triggered by a simple issue. A disconnected sensor, often unplugged during an air filter change, is a common cause for a Code 23. Also, inspect the wiring and connector for any corrosion or damage before replacing the sensor itself.
Choosing the Right Aftermarket IAT Sensor
For a vehicle of this age, finding a new original equipment (OEM) sensor from GM can be difficult and expensive. Aftermarket parts are the most common and practical solution. Brands like Standard Ignition are a well-regarded choice for replacement sensors and are widely available. Customer reviews for Standard Ignition IAT sensors are generally positive, citing good fit and function at a fair price. For a simple component like an IAT sensor (which is a type of resistor called a thermistor), a quality aftermarket part from a reputable brand is a reliable and cost-effective choice.
Cost of Replacing the IAT Sensor
| Part Type | Estimated Cost |
|---|---|
| New Aftermarket (e.g., Standard Ignition) | $30 - $45 |
| New OEM | $45 - $75+ (if available) |
| Shop Labor | $50 - $100 |
Frequently Asked Questions (FAQ)
Where is the IAT sensor located on a 1985-1993 Cavalier?
The IAT sensor is typically located in the air intake system. You can usually find it screwed into the intake manifold or pushed into the air filter housing. It's a small sensor with a two-wire electrical connector.
Can I drive my Cavalier with a bad IAT sensor?
Yes, you can usually drive the vehicle. However, you will likely experience poor engine performance, reduced fuel economy, and increased emissions until it is fixed. It's best to address the issue to avoid long-term problems like carbon buildup.
How difficult is it to replace the IAT sensor?
This is a very simple repair that most DIY mechanics can perform in under 30 minutes. It typically involves unplugging the electrical connector and unscrewing the old sensor. No special tools are usually required beyond basic hand tools.
Is an aftermarket sensor good enough for my Cavalier?
Yes. For this specific part and vehicle, a quality aftermarket sensor from a brand like Standard Ignition is a perfectly acceptable and reliable option. Given the age of the vehicle, it is the most practical and cost-effective choice.
🎬 See a breakdown of IAT sensor symptoms and replacement costs.Helpful Videos
Technical Specifications
OEM Part Numbers: 25036751 25037309 12160244 25171651
The IAT sensor is a thermistor, a resistor that changes its resistance based on temperature. It is a 2-terminal sensor that screws or pushes into the intake tract.
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The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
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