The 2008 Scion tC uses four iridium-tipped spark plugs for its 2.4-liter 2AZ-FE engine with a coil‑on‑plug ignition. Replacement plugs are available from NGK or Denso and should match the OEM heat range and gap, which is typically about 0.043 inches (1.1 mm).
Engine and ignition overview
The tC’s 2AZ-FE engine employs four individual ignition coils (coil‑on‑plug), one per cylinder. This setup requires four spark plugs that can withstand the engine’s heat and firing conditions. Iridium or platinum tips are common in modern replacements to extend life compared with copper cores.
Replacement options
When replacing, you can choose OEM-equivalent iridium plugs from NGK or Denso, or aftermarket plugs that cross-reference to the 2AZ-FE’s heat range and thread size. The exact part numbers vary by market, but both brands offer lines designed to align with the factory specification.
- NGK Iridium IX spark plugs (cross-reference to the 2AZ-FE OEM spec)
- Denso Iridium Power / Iridium TT spark plugs (cross-reference to the 2AZ-FE OEM spec)
- OEM-grade replacements from Toyota-approved suppliers (with brand cross-reference to NGK/Denso)
In practice, many owners opt for NGK or Denso iridium plugs that are marketed as compatible with the 2AZ-FE, installed with the correct gap and torque per the service manual.
Installation considerations
Before buying or installing plugs, confirm the correct heat range, thread size, and gap for your vehicle. The factory service manual or a dealer can verify the exact OEM spec. Gap new plugs to the recommended setting and torque to the manufacturer’s specification when installing, then test for proper ignition and performance.
- Check the owner’s manual or service guide to confirm the exact plug type and gap for the 2AZ-FE engine.
- Choose NGK or Denso iridium plugs that cross-reference to the recommended OEM spec.
- Ensure the gap matches the specified setting (commonly around 0.043 inches, but verify).
- Install with the proper torque and inspect for proper combustion after replacement.
Using the right plug helps ensure optimal combustion and longevity for the 2008 Scion tC’s engine.
Summary
For a 2008 Scion tC, the spark plugs are four iridium-tipped plugs used with a coil-on-plug ignition on the 2AZ-FE engine. Replacement options include NGK or Denso iridium plugs that cross-reference to the OEM specifications. Always verify the exact heat range and gap from the service manual or a dealer, and opt for OEM-grade replacements for best reliability.