Engine Intake Manifold Temperature Sensor Guide for 1987-1997 Ford F-350
If your F-350 is running rough, has poor fuel economy, or is hard to start, this small sensor could be the culprit.
- This sensor is also known as the Air Charge Temperature (ACT) sensor on these trucks.
- Symptoms of failure include poor MPG, sluggish performance, and hard cold starts.
- It's a simple, inexpensive DIY replacement that can solve major running issues.
- Location varies: check the intake manifold on gas engines and the air filter box on diesels.
Is a Failing Intake Air Temperature Sensor a Big Deal?
Yes, it can be. While the truck may still run, a bad sensor sends incorrect information to the engine computer. This can lead to a range of performance issues, from annoying to potentially damaging in the long run. The computer might think the air is colder or warmer than it actually is, causing it to inject the wrong amount of fuel. This can result in poor fuel economy, failed emissions tests, and a frustrating driving experience.
What to Know Before You Buy
On 1987-1997 Ford F-350s, this sensor is often called the Air Charge Temperature (ACT) sensor. Depending on the year and engine (5.8L, 7.3L, etc.), its location can vary. On earlier models and some gas engines, it's often screwed into a runner of the lower intake manifold. On later models, especially those with Mass Airflow (MAF), it might be located in the air filter box. Always verify the location on your specific truck before ordering.
Choosing the Right Aftermarket Sensor
For a part like this, you don't necessarily need to go to a Ford dealer. Aftermarket brands offer a reliable and cost-effective alternative. The two main tiers available are:
- Tier 1 Aftermarket (e.g., Standard Ignition): Standard Motor Products (SMP), who makes Standard Ignition parts, is a well-respected brand known for producing quality components that often meet or exceed original equipment (OE) specifications. They are a trusted choice for both professional mechanics and DIYers, offering a direct fit and reliable performance.
- Value-Oriented Brands (e.g., True Tech): While searches for "True Tech" auto parts often lead to reviews for repair shops rather than the parts brand itself, this tier generally represents a budget-friendly option. For a simple sensor like the ACT/IAT, these parts can perform adequately, but may not have the same level of quality control or longevity as a Tier 1 brand.
Pro Tip: Given the low cost of this part and its importance for engine performance, opting for a well-known brand like Standard Ignition is a smart investment for long-term reliability.
Cost of Replacing the Intake Temperature Sensor
| Item | Estimated Cost |
|---|---|
| New Aftermarket Sensor | $15 - $45 |
| Shop Labor | $50 - $100 |
| Total Estimated Cost (Installed) | $65 - $145 |
Frequently Asked Questions
Where is the intake temperature sensor located on my F-350?
It varies by year and engine. For many gas engines like the 5.8L, check the lower intake manifold, on the driver's side, sometimes hidden 🎬 Watch how to locate and change the ACT sensor on a 5.8L V8. near the fuel injectors. For 7.3L Power Stroke engines, it is often found in the stock air filter box or hanging nearby if an aftermarket intake is installed. On some 7.3L models, a Manifold Air Temperature (MAT) sensor is located in the center of the intake manifold 'Y' pipe.
🎬 See how a faulty MAT sensor affects a 7.3L Power Stroke engine.Can I replace this sensor myself?
Yes, this is a great DIY job for beginners. In most cases, it involves unplugging the electrical connector, unscrewing the old sensor with a wrench (often 11/16"), and installing the new one. The most difficult part is often just reaching it, especially when it's on the lower intake manifold.
What happens if I don't replace a bad sensor?
You will likely continue to experience poor engine performance, reduced fuel economy, and possibly hard starting. The engine will run on incorrect fuel calculations, which can lead to other issues over time, such as fouled spark plugs from running too rich.
Is this the same as the coolant temperature sensor?
No. The Intake Air Temperature sensor measures air temperature, while the Engine Coolant Temperature (ECT) sensor measures the temperature of the engine's coolant. Both are critical inputs for the ECU, but they are separate parts with different locations and functions.
Helpful Videos
Technical Specifications
OEM Part Numbers: F62F-12A697-AA 9C1Z12A697B
Typically a two-terminal thermistor that screws into the intake path.
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 F-350: