Parts for your 2002 Toyota Caldina-Spark plugs

2002 Toyota Caldina spark plugs — what they do and when to change them

Based on technical references — Toyota service literature for the T240-series Caldina (2002), Toyota New Car Features for the 1ZZ-FE, 1AZ-FSE (D-4) and 3S-GTE engines, plus Denso/NGK application catalogues — the 2002 Toyota Caldina is petrol-powered and uses spark plugs. The direct-injection 1AZ-FSE is still a petrol engine and also relies on spark plugs for ignition. So spark plugs are absolutely relevant on this model.

On a 2002 Caldina, spark plugs ignite the air–fuel mix at precisely the right moment so the engine runs smoothly, starts easily, and sips fuel rather than guzzles it. Most variants run coil-on-plug ignition, so each plug gets a strong, clean spark. Iridium or platinum fine-wire plugs were common from factory, chosen for long life and stable spark under Aussie and Kiwi conditions.

For regular servicing, fresh plugs keep the Caldina perky and efficient. As a rule of thumb, iridium plugs in the 1ZZ-FE and 1AZ-FSE are typically due around 100,000 km, while the higher-heat turbo 3S-GTE often benefits from shorter intervals (around 20,000–40,000 km depending on tune and driving). Always match the interval to the engine code and driving style, then confirm against the owner’s manual or a Toyota repair guide.

• Tell-tales of tired plugs: harder starting, rough idle, hesitation, misfires under load, higher fuel use, and sooty or worn electrodes.
• Fitment tips: blow out debris before removal, work on a cold engine, and thread plugs in by hand first to avoid cross-threading.
• Torque: typical Toyota alloy heads call for roughly 18–25 Nm for gasketed plugs, but follow the exact spec for the engine.
• Gap: most iridium plugs are pre-gapped around 1.0–1.1 mm