A Guide to the 2003-2009 Hummer H2 Engine Intake Manifold Gasket Set
Experiencing coolant leaks or a rough engine idle? Your H2's intake manifold gaskets could be the problem.
- A failing intake manifold gasket on an H2 will cause either a coolant leak, a vacuum leak, or both, leading to overheating, rough idle, and lean codes (P0171, P0174).
- This is a labor-intensive job. It is highly recommended to also replace the knock sensors and their wiring harness at the same time to avoid future repeat labor.
- Aftermarket gaskets from brands like Fel-Pro often feature an upgraded metal-core design (e.g., MS98016T) that is more durable than the original plastic-frame OEM gaskets.
- Always verify the gasket part number for your specific engine (6.0L or 6.2L), as intake port shapes can differ between model years.
Is Your Hummer H2's Intake Gasket Failing?
A failing intake manifold gasket on a 2003-2009 Hummer H2 is a common issue, but one that can cause significant problems if ignored. These gaskets live in a harsh environment of constant temperature changes, which can cause the original plastic and rubber components to become brittle, crack, and leak over time. The two main types of leaks are vacuum leaks and coolant leaks, each with its own set of symptoms.
Symptoms of a Bad Intake Manifold Gasket
- Coolant Leaks: This is a major sign. You might notice a sweet smell of antifreeze after a drive or see puddles of coolant under your truck. The leak often appears at the front or rear of the engine, where the manifold meets the cylinder heads.
- Engine Overheating: A significant coolant leak will lead to low coolant levels and can cause your H2's engine to overheat, which can result in severe engine damage.
- Rough Idle and Misfires: A vacuum leak allows extra, unmeasured air into the engine. This throws off the air-fuel mixture, causing a shaky or unstable idle, and can lead to engine misfires (often felt as a shudder).
- Check Engine Light: A vacuum leak will almost always trigger the Check Engine Light. Common codes include P0171 and P0174, which indicate the engine is running too lean (too much air, not enough fuel). Misfire codes, like P0300, are also possible.
- Reduced Power and Fuel Economy: With the air-fuel mixture out of balance, your H2 will feel sluggish, especially when accelerating, and you'll notice you're using more fuel than usual.
A Note on Knock Sensors
The knock sensors on the H2's V8 engine are located in the engine valley, underneath the intake manifold. This area is notorious for collecting water and debris, which corrodes the sensors and their wiring harness, leading to fault codes (P0327, P0332) and poor performance. Since replacing the intake manifold gaskets requires removing the manifold, it is highly recommended to replace the knock sensors and the wiring harness at the same time. Doing so is a smart, preventative measure that saves you from having to do the same labor-intensive job twice.
Choosing the Right Aftermarket Gasket Set
When it comes to replacing your intake manifold gaskets, you have several aftermarket options. The original factory gaskets were often a plastic carrier design that could become brittle. Many aftermarket brands offer an upgraded design for better durability.
Brand Quality Tiers
- Premium Aftermarket (Upgrade): Brands like Fel-Pro are highly regarded for this specific repair. Their PermaDryPlus gaskets (like part number MS98016T) feature a more durable aluminized steel carrier instead of plastic. This design is more resistant to heat and provides a better, longer-lasting seal, especially on engines with high mileage where the sealing surfaces may not be perfect. Many mechanics and H2 owners consider this an upgrade over the original part.
- OEM-Equivalent: ACDelco is the original equipment manufacturer for GM. Choosing ACDelco ensures you get a part that fits exactly like the original. However, depending on the part number, it may be the original plastic design, which could be prone to the same failure over time. Victor Reinz (Reinz) is another brand often considered to be of OEM quality.
- Standard Aftermarket: Brands like Dorman, Apex, and other private labels offer cost-effective solutions. Dorman sometimes provides kits that include extra hardware, which can be convenient. While these gaskets will get the job done, they may not feature the upgraded metal-carrier design of premium brands. They are a solid choice for budget-conscious repairs.
Pro Tip: For the 6.0L and 6.2L V8s in the Hummer H2, the Fel-Pro MS98016T gasket set is a popular and well-reviewed choice that provides an upgraded metal frame for improved durability over the OEM plastic design.
Cost of Replacing Hummer H2 Intake Manifold Gaskets
| Part/Service | Estimated Cost |
|---|---|
| New Aftermarket Gasket Set | $32 - $145 |
| Shop Labor | $317 - $465 |
| Total Estimated Cost | $349 - $610 |
Frequently Asked Questions
Do I need to replace the intake manifold bolts?
It is not always required, but it is good practice. Some gasket kits may come with new bolts. The most important thing is to tighten the original or new bolts in the correct sequence and to the proper torque specifications to ensure the gasket seals evenly and to avoid damaging the intake manifold.
What else should I replace while the intake manifold is off?
Because accessing the intake manifold is labor-intensive, it's smart to replace other parts located underneath it. This includes both knock sensors and the knock sensor wiring harness, which are common failure points due to water intrusion. It's also a good time to inspect and potentially replace the oil pressure sending unit, which is located at the back of the engine block behind the manifold.
Is this a DIY-friendly job?
For an experienced DIY mechanic, this is a manageable job that takes several hours. It requires disconnecting fuel lines, electrical connectors, and hoses, and carefully cleaning the gasket surfaces. However, due to the number of steps and the need for a torque wrench for reassembly, beginners may want to leave this job to a professional.
My H2 has a 6.0L V8. Will these gaskets fit the 6.2L V8?
The 2003-2007 H2 used the 6.0L V8, while the 2008-2009 models used the 6.2L V8. While many gaskets are similar, the intake port shapes can differ ('cathedral' vs. 'rectangle'). Always confirm the part fitment for your specific year and engine size before purchasing. For example, the Fel-Pro MS98016T fits the 6.0L and the 2009 6.2L with cathedral ports.
Technical Specifications
OEM Part Numbers: 89060413 89017589 19207929
Fits 2003-2009 Hummer H2 with 6.0L LQ4 or 6.2L L92 V8 engines. Gasket material is typically molded rubber over a plastic or aluminized steel carrier. Set includes two gaskets (left and right bank).
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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.
- Hummer H2: