A Guide to the 2012-2018 Ford F-150 Engine Intake Manifold Gasket Set
Leaking coolant or hearing a hiss? Your F-150's intake manifold gasket might be the problem.
- Symptoms often include a Check Engine Light for lean codes (P0171/P0174), rough idle, and coolant leaks near the front of the engine.
- Inspect the plastic intake manifold for cracks and, on 5.0L engines, check for broken Intake Manifold Runner Control (IMRC) linkage, as this may require replacing the entire manifold.
- Aftermarket brands like Fel-Pro and Victor Reinz offer reliable, high-quality replacements that are trusted by professionals.
- The job is DIY-feasible for those with moderate experience, but requires a torque wrench and careful attention to the bolt tightening sequence.
Is Your F-150's Intake Manifold Gasket Failing?
A bad intake manifold gasket can cause problems ranging from annoying to serious. Because the gasket seals both air and, in many cases, coolant, a failure can result in either a vacuum leak, a coolant leak, or both. Catching the signs early can save you from more expensive engine repairs down the road.
Common Symptoms of a Bad Gasket:
- Rough Idle or Stalling: Extra air getting into the engine through a leak upsets the air-fuel balance, causing the engine to run rough, shake, or even stall at stops.
- Check Engine Light: A vacuum leak will often trigger lean condition codes like P0171 and P0174. Misfire codes (P0300 series) can also occur.
- Coolant Leaks: You might see puddles of red, green, or yellow coolant under your truck, especially near the front of the engine. On some F-150 engines, a common failure point is the coolant crossover tube on the intake manifold.
- Engine Overheating: A significant coolant leak will cause the engine to run hotter than normal and can lead to overheating, which risks serious damage like a blown head gasket.
- Hissing Sounds: A distinct hissing or whistling noise from the engine bay, especially when accelerating, is a classic sign of a vacuum leak. 🎬 Watch this video to see common symptoms of gasket failure.
A Note on F-150 Engine Variations
The 2012-2018 F-150 was available with several engines, including the 5.0L V8, 3.5L EcoBoost V6, and 3.7L V6. The exact design of the intake manifold and gaskets differs between them. For example, issues with the Intake Manifold Runner Control (IMRC) are a known problem on some 5.0L engines, which can cause power loss and may require replacing the entire manifold, not just the gaskets. Coolant leaks from turbocharger lines are a specific concern on 3.5L EcoBoost models. 🎬 Learn more about identifying coolant leaks on 3.5L EcoBoost engines. Always verify the correct part for your specific engine before ordering.
Choosing the Right Aftermarket Gasket Set
When it's time for a replacement, you have options. While OEM gaskets are available, the aftermarket offers quality alternatives that often provide excellent value and performance. Here’s a look at some popular brands.
- Fel-Pro: Often considered a top-tier aftermarket brand, Fel-Pro is a go-to for many professional mechanics and DIYers. They engineer their gaskets for the "real-world" repair environment, meaning they are designed to seal surfaces that may not be perfectly flat after years of use. They often feature improved materials over the original stock gaskets.
- Victor Gaskets (Victor Reinz): This brand is a well-respected OEM supplier for many manufacturers. Choosing Victor Reinz often means you are getting a part with quality equivalent to the one your truck came with from the factory. They are known for making high-quality, reliable gaskets.
- Cometic Gasket: Cometic is well-known in the high-performance and racing world. They offer gaskets made from advanced materials, like multi-layer steel (MLS) or specialized molded rubber, designed to handle high-compression, boosted, or nitrous applications. For a stock or lightly modified F-150, a Cometic gasket might be overkill, but it's a premium option for those who want maximum durability.
Pro Tip: While you're replacing the intake manifold gaskets, it's a good time to inspect the intake manifold itself for cracks, especially if it's a plastic one. It's also wise to replace the thermostat and any related O-rings or small hoses that are difficult to access otherwise.
Cost of Replacing an F-150 Intake Manifold Gasket Set
The cost can vary significantly based on your engine, location, and whether you do the work yourself. The job is more complex on EcoBoost engines compared to the 5.0L V8 due to the extra plumbing for the turbochargers.
| Item | Estimated Cost |
|---|---|
| New Aftermarket Gasket Set | $41 - $92 |
| Shop Labor | $378 - $554 |
| Total Professional Replacement | ~$420 - $650+ |
Frequently Asked Questions
Is this a DIY job?
For a mechanically inclined person with the right tools, yes. The difficulty is moderate. On a 5.0L V8, it can take 4-6 hours. You will need a torque wrench to tighten the manifold bolts in the correct sequence to ensure a proper seal. Draining some coolant is also required for engines where coolant flows through the manifold.
Do I need to replace the whole intake manifold?
Not always, but you should inspect it carefully. The original plastic manifolds can become brittle and crack over time. On some 5.0L engines, the intake manifold runner control (IMRC) linkage can break, which requires a full manifold replacement 🎬 See how to fix common Intake Manifold Runner Control issues. to fix. If the manifold is damaged, replacing it along with the gaskets is the smart move to avoid doing the job twice.
Are there any recalls for this issue?
As of early 2026, there are no specific NHTSA recalls for the intake manifold gaskets on 2012-2018 Ford F-150s. However, always check for the latest recalls and Technical Service Bulletins (TSBs) for your specific vehicle, as manufacturers release new information periodically.
Should I use RTV sealant with the new gaskets?
In most cases, modern gaskets are designed to be installed dry. However, some service manuals specify applying a small amount of RTV sealant in the corners or at joints where engine blocks and heads meet. Always follow the instructions included with your new gasket set or consult a factory service manual.
Helpful Videos
Technical Specifications
OEM Part Numbers: AT4Z-9H486-A
Gasket sets vary by engine (5.0L V8, 3.5L EcoBoost, 3.7L V6, etc.). Sets typically include upper and lower intake gaskets made of molded rubber or similar composite materials. Some kits may include a new thermostat gasket.
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.
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