1987-1991 Ford Country Squire Engine Intake Manifold Temperature Sensor Guide
Keep your classic wagon running smoothly by understanding this critical engine sensor.
- A bad IAT sensor can cause poor fuel economy, rough idle, and Check Engine Light codes 24 or 54.
- Replacement is simple, requiring only basic hand tools, and is located on the intake manifold.
- Standard Ignition is a well-regarded aftermarket brand for this part, while True Tech offers a budget-friendly alternative.
- Since OEM parts are no longer made, a quality aftermarket part is the only option for a new sensor.
Understanding the Intake Air Temperature Sensor in Your Ford Wagon
For the fuel-injected 5.0L V8 engine in your 1987-1991 Ford Country Squire, the Intake Air Temperature (IAT) sensor is a small but vital component. It's a simple thermistor—a resistor that changes its resistance based on temperature. This signal is read by your car's Electronic Engine Control (EEC-IV) computer to make constant adjustments to the air/fuel ratio and spark timing, ensuring the engine runs efficiently under all conditions. A failing sensor can lead to a range of drivability issues, from poor fuel mileage to rough running.
Choosing the Right Aftermarket IAT Sensor
For a vehicle from this era, new OEM parts from Ford are generally unavailable. Aftermarket manufacturers are the primary source for these sensors. The key difference between available brands often comes down to manufacturing consistency and quality control.
Aftermarket Brand Tiers
| Brand Tier | Brands | General Quality & Price |
|---|---|---|
| Quality Aftermarket | Standard Ignition (Standard Motor Products) | A long-established brand known for producing parts that meet or exceed original specifications. Often a preferred choice for professional mechanics, offering reliable performance and durability. Expect to pay a bit more for this quality. |
| Standard / Economy | True Tech | This brand falls into the economy category, offering a cost-effective solution. While functional, the long-term reliability and consistency may not match that of higher-tier brands. It can be a suitable choice for budget-conscious repairs. |
Pro Tip: Check the Connector
Before ordering, inspect your original sensor's electrical connector. While most are standard for this model, it's a good practice to visually match the new part to your old one. The connector pigtail is also sold as a separate part if yours is cracked or damaged.
Frequently Asked Questions
Where is the IAT sensor located on a 1987-1991 Country Squire?
On the 5.0L V8 engine, the IAT sensor is typically screwed into one of the intake manifold runners. It's a small, two-wire sensor that threads directly into the manifold to measure the temperature of the air as it heads toward the cylinders.
Are there any recalls or TSBs for this part?
No, searches of the National Highway Traffic Safety Administration (NHTSA) database and technical service bulletin archives did not reveal any specific recalls or TSBs for the Intake Air Temperature sensor on the 1987-1991 Ford Country Squire or its platform mates like the LTD Crown Victoria.
What are the EEC-IV trouble codes for a bad IAT sensor?
Your vehicle uses the EEC-IV diagnostic system. A faulty IAT sensor can trigger specific codes that can be read with a simple code reader. The most common codes are Code 24 and Code 54, which indicate a problem with the IAT sensor circuit.
Can I clean the IAT sensor instead of replacing it?
Sometimes, the sensor tip can become coated with oil or carbon, which insulates it and causes incorrect readings. You can try cleaning it carefully with a dedicated mass air flow sensor cleaner. However, if the sensor has failed internally due to age, cleaning will not fix it and replacement is necessary.
Technical Specifications
OEM Part Numbers: E0AE12A697AA
Terminal Quantity: 2, Terminal Type: Pin, Terminal Gender: Male
We Have This Part in Stock
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.
- Ford Country Squire: