Parts for your 2009 Honda Stream-Manifold gasket

2009 Honda Stream manifold gasket — what it does and when to replace it

Yes, the 2009 Honda Stream uses manifold gaskets. The factory service information for the RN6–RN9 Stream (R18A 1.8‑litre and R20A 2.0‑litre engines) specifies both an intake manifold gasket and an exhaust manifold gasket, and Honda’s Electronic Parts Catalogue lists them as separate service parts for this model. Reputable workshop data providers and gasket catalogues also show replacement part numbers for both, confirming they’re standard fitment on this vehicle.

On this Stream, the manifold gaskets seal the join between the cylinder head and the intake manifold (air side) and between the head and the exhaust manifold/catalyst (hot side). They stop unmetered air sneaking in on the intake and prevent exhaust gas and noise escaping on the exhaust. When they’re healthy, the engine breathes properly, fuel trims stay tidy, emissions kit works as intended, and the cabin stays quiet and fume‑free.

There’s no fixed replacement interval, they’re typically changed when a manifold comes off for other work, or if there are leak symptoms. For servicing the 2009 Honda Stream, a sensible approach is:

• Inspect for leaks during scheduled services, especially after 100,000 km or any time the manifolds have been disturbed.
• Replace gaskets whenever the manifold is removed — they’re designed to crush once and seal precisely.
• Use OEM or high‑quality equivalents, clean the mating faces, and follow the service manual torque values and tightening sequence.
• After refit, run the engine to operating temperature and recheck for any hiss, tick, or whiff of exhaust, snug fasteners if the manual permits.

Common clues a Stream’s manifold gasket is on the way out include a ticking noise on cold start that softens warm, a sharp hiss under load, sooty staining around the exhaust flange, a rough or high idle, lean fuel trims, or a check‑engine light (often for mixture or catalyst efficiency). Intake leaks can mess with drivability and economy, while exhaust leaks can heat nearby components and affect O2 sensor readings.

DIY‑inclined owners can tackle intake gaskets with basic tools, the exhaust side can be trickier thanks to tight access and heat‑baked fasteners. A workshop will typically recommend new nuts/studs and may add a quick manifold face check to make sure everything’s true. Done right, fresh gaskets restore smooth running and keep the Stream compliant with local emissions and noise rules.

• Popular questions

Does the 2009 Honda Stream have intake and exhaust manifold gaskets?
Yes. The RN6–RN9 Stream with the R18A/R20A engines uses dedicated intake and exhaust manifold gaskets, as shown in Honda’s service literature and parts catalogue for this model.

What are the symptoms of a blown manifold gasket on a 2009 Stream?
Expect a ticking or hissing noise, exhaust smell, soot marks near the flange, rough idle, lean fuel trims, and sometimes a check‑engine light. Intake leaks affect drivability, exhaust leaks can upset O2 readings and make the cabin noisy or smelly.

Should the manifold gasket be replaced every time the manifold comes off?
Absolutely. They’re crush‑type seals designed for one‑time use. Best practice is to fit new gaskets, clean mating surfaces, and torque in the specified sequence to avoid repeat leaks.