Parts for your 2008 Holden Commodore-Fuel injectors

2008 Holden Commodore Fuel Injectors

Fuel injectors are absolutely relevant on the 2008 Holden Commodore. Technical references including the Holden VE Commodore Service Manual (Engine Controls for LY7 V6 and L98 V8), GM Global Service Information for 2008 VE, and mainstream OE supplier data all specify electronically controlled, sequential multi‑port fuel injection on these engines. There’s no carburettor or throttle‑body injection on this model year, and direct injection (SIDI) didn’t arrive until later models.

On a 2008 Commodore, the injectors’ job is to meter the right amount of fuel and atomise it finely at each intake port, so the engine starts cleanly, idles smoothly, and delivers solid power without drinking heaps of fuel. Good injectors also help the car meet emissions rules and keep the catalytic converters happy. Whether it’s the 3.6‑litre Alloytec V6 or the 6.0‑litre V8, healthy injectors make a noticeable difference in throttle response and fuel economy.

They’re not a scheduled replacement item in Holden’s standard servicing, but they do benefit from periodic attention—especially as kilometres climb or if the car does lots of short trips. A practical approach is:

• Use quality petrol and, every 20–30,000 km, a reputable injector cleaner.
• Every 60–100,000 km, consider professional ultrasonic cleaning and flow testing.
• Inspect and replace injector O‑rings and rail seals whenever the rail is removed—always lube new seals lightly with clean engine oil.
• If an injector is replaced, match flow rates and keep the set balanced, on high‑km engines, replacing as a set can restore even fueling.

Common signs of injector trouble include rough idle, hard starting, misfires under load, pinging, high fuel use, fuel smells, or sooty tailpipes. A scan tool look at misfire counters and fuel trims (short‑ and long‑term) is the quickest way to confirm. Workshops may run an injector balance/leakdown test to pinpoint a lazy or leaking unit.

DIY or pro, always depressurise the fuel system, disconnect the battery, and follow torque specs for the rail. If the vehicle runs LPG via an aftermarket system, note it will have separate LPG injectors with their own service needs—different parts, different tests.

Popular questions

Does a 2008 Commodore use direct injection?
No. The 2008 VE uses sequential multi‑port fuel injection. Holden’s SIDI (direct injection) V6 arrived in later model years, so 2008 cars have port injectors at the intake ports rather than DI injectors in the combustion chamber.

How often should the injectors be cleaned or replaced?
They don’t have a fixed replacement interval. Many owners see good results with cleaner every 20–30,000 km and professional cleaning/flow testing around 60–100,000 km. Replace only when faulty, and always fit new seals when the rail comes off.

What are the symptoms of a failing injector on a 2008 Commodore?
Look for rough idle, misfires, poor fuel economy, hesitation, fuel odour, or hard starts. A scan of fuel trims and misfire data will usually confirm it, and an injector balance test can isolate the culprit.