Parts for your 2008 Honda Accord-Manifold gasket

2008 Honda Accord manifold gasket: what it does and when to replace it

Yes — a manifold gasket is absolutely used on the 2008 Honda Accord. Technical references including the Honda factory service manual and Honda EPC (parts catalogue) for the 2008 Accord show both intake manifold gaskets and exhaust manifold gaskets fitted across the 2.4‑litre i‑VTEC four‑cylinder and 3.5‑litre i‑VTEC V6 engines. Major OEM gasket suppliers list direct‑fit intake and exhaust manifold gaskets for this model as well, confirming fitment.

This gasket’s job is simple but vital: it seals the joint between the engine and its manifolds. The intake manifold gasket keeps unmetered air from sneaking into the engine, so the Accord can control its air–fuel mix, idle smoothly and sip petrol efficiently. The exhaust manifold gasket locks exhaust gases inside the manifold so they flow through the catalytic converter, not out into the engine bay. On the V6 there’s also an upper intake plenum gasket between the two‑piece manifold sections.

When a manifold gasket starts to fail, the Accord can show a rough or high idle, a hiss or whistle, lean‑condition fault codes, black soot around the exhaust flange, or a tick on cold start. Left too long, an exhaust leak can cook nearby components and an intake leak can cause poor fuel economy and lacklustre performance.

Manifold gaskets aren’t a scheduled replacement item, but they should be renewed any time the manifold is removed, or if there are leak symptoms. A competent workshop will clean the mating faces, inspect for warpage, and fit new OEM‑quality gaskets, following Honda’s torque specs and tightening sequence. On higher‑kilometre cars (say 150,000 km and up), it’s smart preventative maintenance when doing related jobs like spark plugs, EGR cleaning, or catalytic converter work.

• Always replace, don’t re‑use, manifold gaskets once disturbed.
• Use the correct gasket style for the engine variant (2.4L vs 3.5L, upper plenum vs lower manifold).
• Check and replace any disturbed O‑rings, PCV and vacuum hoses, and the exhaust “donut” gasket at the front pipe if removed.
• After refit, smoke‑test for intake leaks and check fuel trims, for exhaust, listen for ticks and look for soot.

Popular questions about 2008 Honda Accord manifold gaskets

What are the signs of a bad manifold gasket on a 2008 Accord?
Owners often notice a hissing or whistling at idle, a rough or high idle, poor fuel economy, or a check‑engine light from lean running if the intake gasket leaks. An exhaust gasket leak can sound like a ticking on cold start, may leave sooty marks near the manifold flange, and can make the cabin smell exhausty.

How often should the manifold gaskets be replaced?
There’s no fixed kilometre interval. Replace them whenever a manifold is removed or if test results and symptoms point to a leak. On higher‑mileage cars, proactively fitting new gaskets during related jobs saves double labour and helps prevent vacuum or exhaust leaks down the track.

Is it OK to drive with a leaking manifold gasket?
It’s best not to. An intake leak can cause lean running that affects performance and emissions, while an exhaust leak can heat‑soak nearby parts and allow fumes into the cabin. Short trips to a workshop are usually fine, but booking prompt repair is the sensible move.