Parts for your 2006 Holden Commodore-Manifold gasket

2006 Holden Commodore manifold gasket — what it does and when to replace it

Technical sources confirm a manifold gasket is definitely used on the 2006 Holden Commodore. Factory service manuals for VZ and early VE models (e.g., Gregory’s Holden Commodore VY–VZ 2002–2006, Holden VE Commodore Workshop Manual), plus OEM/aftermarket catalogues (ACDelco/GM parts listings, Permaseal and Victor Reinz gasket catalogues) all list intake and exhaust manifold gaskets for the 3.6L Alloytec V6 and LS‑series V8 engines. So yes — manifold gaskets are relevant, fitted, and serviceable on this model year.

On a 2006 Commodore, the manifold gaskets seal two key areas: the intake manifold (air path into the engine) and the exhaust manifolds (hot gases out). The intake manifold gasket keeps unmetered air from sneaking past the runners, which protects idle quality and fuel trims. The exhaust manifold gaskets, usually multi‑layer steel on these engines, keep exhaust gas where it belongs — inside the headers — preventing that sharp “ticking” on cold start, soot marks, and any fumes in the engine bay.

These gaskets aren’t a scheduled replacement item, they’re changed on condition or any time the manifolds come off for other work. For the intake side on the Alloytec, expect moulded rubber/composite gaskets that like clean, flat mating surfaces. On the LS‑V8, the intake uses reusable style seals but they should be replaced if crushed, nicked, or flattened. Exhaust gaskets should be renewed whenever the manifolds are removed, combine this with fresh studs/nuts if they’re corroded.

Tell‑tale signs it’s time for attention include a rough or hunting idle, hissing under the bonnet, lean fault codes, a cold‑start tick that quietens as it warms, whiffs of exhaust in the bay, or a drop in fuel economy. Any visible sooting around the exhaust flange is a giveaway. Left unattended, leaks can skew fuelling, cost power and economy, and in the case of exhaust leaks, cook nearby components.

Good servicing practice on a 2006 Commodore is to replace the manifold gaskets whenever the intake is removed for spark plugs/coils or when chasing vacuum leaks, and to fit new exhaust gaskets if the headers come off for oxygen sensors or catalytic work. Use quality gaskets (MLS for exhaust, OE‑style moulded seals for intake), clean both faces carefully, and follow the workshop manual torque specs and tightening sequence. A torque wrench, patience, and letting the engine cool completely before starting the job will save busted studs and rework. After refitting, a quick scan‑tool check of fuel trims and an idle test drive helps confirm it’s sealed up sweet as.

• Watch for: rough idle, hissing or ticking noises, fuel trim codes, exhaust smell/soot, and reduced economy.
• Best practice: new gaskets on reassembly, correct torque and sequence, recheck fasteners after a few heat cycles if specified by the manual.

Does a 2006 Holden Commodore have a manifold gasket?

Yes. Both the intake and exhaust manifolds use gaskets on 2006 VZ and early VE Commodores. This is documented in Holden’s service manuals and reflected in OEM and aftermarket parts catalogues for the 3.6L Alloytec V6 and LS‑series V8s.

What symptoms point to a bad manifold gasket on a 2006 Commodore?

For the intake side: rough or high idle, a hissing sound, and lean codes can show up. For the exhaust side: a sharp ticking on cold start, exhaust smell in the engine bay, black sooty marks near the flange, and sometimes a slight loss of low‑down torque and economy.

Can a handy DIYer replace the manifold gasket at home?

Generally, yes for confident DIYers with a torque wrench and a good manual. Intake gaskets are a moderate job, label hoses and electrical plugs, keep everything clean, and follow the torque sequence. Exhaust gaskets can be tougher due to heat‑baked fasteners — soak with penetrating oil, work on a stone‑cold engine, and be prepared to replace studs/nuts. If a stud snaps, it’s a job for a pro. Labour time ranges from a couple of hours for intake refresh to several hours if exhaust hardware fights back.