Parts for your 2008 Honda Odyssey-Manifold gasket

2008 Honda Odyssey manifold gasket — what it is and when to replace it

Yes, a manifold gasket is absolutely relevant and used on the 2008 Honda Odyssey. Technical sources including the Honda Service Manual (engine—intake and exhaust manifold procedures) and OEM parts catalogues for the 2005–2010 Odyssey confirm the vehicle uses both intake manifold gaskets and exhaust manifold gaskets on its J‑series V6 engine.

On this Odyssey, the manifold gaskets do the quiet, important work of sealing. Intake manifold gaskets keep unmetered air from sneaking into the engine and, on this model, also help seal coolant passages that run through parts of the intake assembly. Exhaust manifold gaskets seal the hot high‑pressure gases as they leave the cylinder head, preventing that tell‑tale ticking, fumes under the bonnet, and loss of torque. Because they live through thousands of heat cycles and vibrations, these gaskets eventually harden, flatten, or crack—especially if the engine has overheated or the manifolds have been off before.

As part of routine servicing, it’s smart for a technician to check for manifold gasket issues whenever there are drivability niggles or noises. Common signs include:

• Hissing or whistling at idle, rough running, or lean codes from the intake side
• Ticking on cold start, exhaust smell in the cabin, or soot marks near the manifold on the exhaust side

If the intake or exhaust manifold is removed on a 2008 Odyssey, replace the gaskets—don’t reuse them. Genuine or high‑quality equivalents match the manifold’s surface finish and bolt load, which helps avoid repeat leaks. A careful clean of the mating faces (no gouging), following the Honda torque sequence and specs, and checking the manifold for warpage are key steps. RTV sealant should only be used where the service manual explicitly calls for it, modern Odyssey gaskets are designed to seal dry.

While there’s no kilometre-based replacement interval, preventative replacement is sensible when you’re already in there for related work (spark plugs, rocker cover gaskets, EGR cleaning, or catalytic converter/manifold service). For owners, keeping cooling system health in check (fresh coolant, no overheating) helps the intake gaskets live longer, and fixing any engine mounts or exhaust hangers that allow excess movement protects the exhaust gaskets.

Done properly, a fresh set of manifold gaskets restores smooth idle, quiet starts, and proper fuel trims, keeping the Odyssey cruising happily across Australia and New Zealand.

Popular questions about 2008 Honda Odyssey manifold gaskets

Do all 2008 Odysseys have both intake and exhaust manifold gaskets?
Yes. The J‑series V6 in the 2008 Odyssey uses intake manifold gaskets between the upper/lower intake sections and the cylinder heads, and exhaust manifold gaskets between each manifold (with integral cat) and the heads. These are standard service items referenced in Honda workshop procedures and parts catalogues.

What are the typical symptoms of a failing manifold gasket on this model?
Intake leaks often show up as a rough idle, a hissing sound, high or unstable idle, and lean fuel trim codes. Exhaust leaks tend to cause a ticking noise on cold start that softens as it warms, an exhaust smell under the bonnet, or visible soot near the manifold flange. Fuel economy and low‑rpm torque can also suffer.

How much does replacement usually cost?
Costs vary with which side is leaking and access. Intake manifold gasket replacement is commonly 1.5–3.0 hours plus parts, exhaust manifold gasket work can take longer on the rear bank due to access and heat‑seized hardware. As a rough guide in AU/NZ, expect a few hundred dollars for intake gasket service and potentially more for exhaust work, depending on labour and parts quality.