Parts for your 2002 Daihatsu Gran move-Spark plugs

2002 Daihatsu Gran Move spark plugs — what they do and when to replace them

Yes, the 2002 Daihatsu Gran Move runs spark plugs. Technical references including the Daihatsu Gran Move/Pyzar service literature for the G303/G311 series (HD-EP 1.6‑litre petrol), plus AU/NZ application catalogues from NGK and Denso, list four spark plugs as standard fitment on this model. General servicing data providers (e.g., Autodata) also specify plug gaps and replacement intervals for this petrol engine, confirming spark plugs are relevant to the 2002 Gran Move.

Spark plugs are the tiny workhorses that light off the air–fuel mix in the Gran Move’s cylinders. When they’re healthy, the engine fires up quickly, idles smoothly, pulls cleanly through the revs, and sips less fuel. When they’re tired, drivers often notice hard starting, rough idle, flat spots under load, or higher fuel use.

As part of routine servicing of a 2002 Daihatsu Gran Move, spark plug inspection and timely replacement make a noticeable difference. Copper/nickel plugs typically suit shorter intervals (around 20,000–30,000 km), while long-life platinum or iridium options can stretch much further (often up to 100,000 km), provided the engine is in good nick. Always follow the specific interval and heat range recommended on the under‑bonnet label or in the owner’s manual, and stick with reputable brands that list the correct fit for the HD‑EP petrol engine.

Gap matters. The factory specification for this era of Daihatsu petrol engines commonly lands around 1.0–1.1 mm, confirm against the label or manual. Fitting is straightforward with a 16 mm spark plug socket, but a few habits help avoid dramas: thread each plug by hand first to prevent cross‑threading the alloy head, then torque to spec (typically around 18–25 Nm for M14 plugs in an aluminium head). Modern plated plugs generally don’t need anti‑seize, if it’s used, torque should be reduced accordingly.

It’s smart to give the whole ignition system a once‑over at the same time. Check the plug leads/boots for cracking, oil contamination from a rocker cover leak, or carbon tracking. A light mist of water over the leads in the dark (engine idling) can reveal stray arcing, which points to lead or boot replacement. If the plugs are soot‑black, the engine may be running rich, if they’re chalky white, it could be lean or overheating—either way, it’s worth a further look.

• Signs it’s time: harder starts, misfires under load, rough idle, higher fuel use.
• Service tip: replace all four plugs together and reset the service record with date and kilometres.

Popular questions about 2002 Daihatsu Gran Move spark plugs

What spark plug gap does a 2002 Gran Move use?
Most HD‑EP petrol engines of this model year use a gap around 1.0–1.1 mm. Always verify against the under‑bonnet emission/ignition sticker or the owner’s manual, and match the gap to the plug type supplied by NGK or Denso for the Gran Move.

How often should the spark plugs be changed?
For standard copper plugs, expect roughly 20,000–30,000 km. For platinum or iridium plugs listed for the 2002 Gran Move, intervals can extend up to about 100,000 km. If the car sees lots of short trips or feels down on power, bring replacement forward.

What symptoms point to worn spark plugs on a Gran Move?
Tell‑tales include hard starting, a lumpy idle, misfire under load, and a noticeable uptick in fuel consumption. A quick inspection can confirm fouling or worn electrodes, replacing the set usually restores smooth running.