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Parts for your 2017 Holden Colorado-Spark plugs
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2017 Holden Colorado spark plugs — what’s actually fitted and what to service
Chasing spark plugs for a 2017 Holden Colorado? Here’s the straight talk: this ute doesn’t use spark plugs. The 2017 Colorado sold in Australia and New Zealand runs a 2.8L Duramax turbo‑diesel engine, which relies on compression ignition rather than a spark to fire the mixture. That’s why there’s a glow plug light on the dash at cold start, and no spark plug item listed in the factory service schedule.
Why no spark plugs? In a diesel, air is squeezed to very high pressure so it gets hot enough to ignite fuel the moment it’s injected. Glow plugs only help the engine warm up and start cleanly when it’s cold, but they don’t continuously ignite the charge like spark plugs do in a petrol engine.
What should owners look after instead of spark plugs? For reliable starting and smooth running, it pays to keep on top of:
- Glow plugs and the glow plug control module (tested if cold starts get rough, smoky, or slow)
- Battery health and starter condition (diesels need strong cranking speed)
- Fuel filter changes on schedule, and quality diesel to protect the common‑rail system
- Air filter condition to keep airflow up and soot down
- Periodic EGR/DPF checks if doing lots of short trips
If a glow plug fails, the engine may still start but it’ll be lumpy and a bit smoky when cold. A scan tool will usually log a specific cylinder fault. Replacement is best done with the engine warm (not hot) to reduce the risk of a seized plug. Many techs replace them as a set to keep cold‑start performance consistent. Use parts that match the OEM spec and proper torque, and avoid forcing a stuck plug—snapping one off turns a simple job into a cylinder‑head saga.
Technical sources referenced: 2017 Holden Colorado Owner’s Manual (diesel models show a glow plug indicator and list no spark plug service item), Holden Colorado RG Service and Warranty booklet (maintenance schedule for the 2.8L turbo‑diesel), GM Global Propulsion Systems technical overview for the 2.8L Duramax turbo‑diesel (compression‑ignition design employing glow plugs), and general diesel ignition principles as outlined by Bosch Automotive Diesel Systems literature. On the strength of these sources, spark plugs are not used on the 2017 Holden Colorado.
Popular questions about 2017 Holden Colorado spark plugs
Does a 2017 Holden Colorado have spark plugs?
No. The 2017 Colorado is a turbo‑diesel, so it uses compression ignition with glow plugs for cold starts. There are no spark plugs fitted or scheduled for replacement.
What should be serviced instead of spark plugs on a 2017 Colorado?
Focus on glow plugs, battery and starter condition, fuel and air filters, and ensuring the diesel injection system stays clean. These have a much bigger impact on starting, smoke, and overall drivability than anything “spark” related.
How often do the glow plugs need replacing?
There’s no fixed kilometre interval like petrol spark plugs. Glow plugs are checked when symptoms appear (hard cold starts, misfire when cold, or a glow plug warning). Many last well over 100,000 km, replace any failed units promptly, and consider doing them as a matched set.
