Parts for your 2008 Honda Stream-Manifold gasket

2008 Honda Stream manifold gasket

Based on Honda technical sources — namely the Honda Stream RN6–RN9 workshop manual for the R18A/R20A engines and OEM parts catalogues (Honda EPC and dealer exploded diagrams) — the 2008 Honda Stream does use manifold gaskets. There’s an intake manifold gasket sealing the intake runners to the cylinder head, and an exhaust manifold gasket sealing the exhaust manifold to the head. So “manifold-gasket” absolutely applies to this model.

The manifold gaskets do a simple but critical job: they keep the intake airtight so the engine only breathes metered air, and they keep the exhaust sealed so hot gases don’t leak before the catalytic converter. On the intake side, a healthy gasket helps maintain smooth idle, proper fuel trims and decent fuel economy. On the exhaust side, a good seal prevents noisy ticking, exhaust odour under the bonnet, and incorrect oxygen-sensor readings that can throw the tune out.

While not a scheduled replacement item, these gaskets are best swapped any time the manifold is removed. On a 2008 Stream, that might be during work on the throttle body, EGR-related cleaning, or if chasing vacuum or exhaust leaks. Use quality OEM or equivalent gaskets, clean the mating faces thoroughly, and follow the Honda torque sequence and specification. Avoid random sealants unless the manual specifically calls for them.

• Common clues a manifold gasket is failing:
  • Intake: hissing at idle, rough idle or stumble, lean fault codes (e.g., P0171), higher fuel use.
  • Exhaust: ticking on cold start or acceleration, sooty marks at the flange, exhaust smell, occasional check engine light.

DIYers will find the intake side fairly straightforward with basic hand tools, label hoses and connectors and don’t pinch the new gasket during refit. The exhaust side often needs patience — soak fasteners with penetrant, work on a cool engine, and replace any tired studs or copper nuts. After reassembly, clear any stored codes, let the engine warm fully, and listen for leaks. A quick scan of fuel trims is a neat way to confirm the intake side is properly sealed.

Leaving a leak isn’t worth it. Besides the noise and smell, unmetered air can make the engine run off-song, and an upstream exhaust leak can skew sensor readings and impact emissions. Fresh gaskets restore quiet, smooth running and that easy-going Stream reliability.

Popular FAQs

Does the 2008 Honda Stream have both intake and exhaust manifold gaskets?
Yes. Technical diagrams and Honda workshop literature for the RN6–RN9 Stream (R18A/R20A) show a dedicated intake manifold gasket and an exhaust manifold gasket between the head and manifold flanges.

How much does manifold gasket replacement cost in Australia or New Zealand?
As a ballpark, intake manifold gaskets are typically AUD/NZD $25–$80 for parts, exhaust manifold gaskets are often AUD/NZD $40–$120. Labour varies by side and condition of hardware, commonly 1.5–3.0 hours for intake and 1.0–3.0 hours for exhaust. Corroded studs can add time.

Is it okay to keep driving with a leaking manifold gasket?
Not ideal. Intake leaks can cause rough running and fault codes, while exhaust leaks can be noisy, smelly, and may affect sensor readings. Prolonged driving with a bad exhaust leak can also stress nearby components. It’s best to sort it promptly.