The right spark plugs for a 2008 Honda Accord depend on the engine: both the 2.4L four-cylinder and the 3.5L V6 typically use iridium spark plugs from NGK or Denso, with a common gap of around 0.043 inches. Expect life on iridium plugs to be up to about 100,000 miles, depending on driving conditions and maintenance.
In 2008 the Accord offered two main powertrains: a 2.4-liter four-cylinder (K24Z3) and a 3.5-liter V6 (J35A). Which plugs you buy should align with your exact engine and your preference for OEM-equivalent or reputable aftermarket options. The following sections break down recommendations by engine and then provide installation guidance.
Engine configurations and plug recommendations
Below is a concise guide to the two engines commonly found in the 2008 Accord and the plug choices that service shops frequently recommend.
2.4L four-cylinder (K24Z3)
- Plug type: NGK Iridium IX or Denso Iridium TT (iridium plugs are favored for longevity and reliability in this engine).
- Gap: 0.043 inches (1.1 mm).
- Torque: 13–16 ft-lbs (18–22 Nm).
- Replacement interval: up to about 100,000 miles with iridium plugs, depending on conditions.
3.5L V6 (J35A)
- Plug type: NGK Iridium IX or Denso Iridium TT.
- Gap: 0.043 inches (1.1 mm).
- Torque: 15–18 ft-lbs (20–24 Nm).
- Replacement interval: up to about 100,000 miles with iridium plugs, subject to driving style and conditions.
Note: If you opt for platinum or copper plugs instead of iridium, expect shorter service life and potentially different heat-range recommendations. Always confirm gap and torque on the packaging or in the vehicle service manual.
Choosing the right plug and installation tips
These practical tips help ensure a proper fit and reliable performance when you replace the spark plugs.
- Confirm your exact engine code (K24Z3 or J35A) to ensure the correct plug type and gap.
- Choose a reputable brand: NGK or Denso iridium plugs are widely recommended for the Honda 2008 Accord.
- Check or set the gap to 0.043 inches (1.1 mm) if the plugs are not pre-gapped.
- Torque the plugs to the manufacturer’s specification (typically around 13–18 Nm, depending on engine and plug design).
- Reconnect coil packs or ignition wires, and perform a test run to verify smooth idle and absence of misfires.
In summary, iridium plugs from NGK or Denso provide robust performance for both the 2.4L and 3.5L engines in the 2008 Accord, with a typical gap of 0.043 inches and a long service life when properly installed. If you’re unsure which engine you have or which exact part numbers apply in your region, consult the owner's manual or a local Honda service center for precise recommendations.
Summary
For a 2008 Honda Accord, the practical choice is iridium spark plugs from NGK or Denso, suitable for both the 2.4L four-cylinder and the 3.5L V6. Use a 0.043-inch gap and torque per the service manual, with replacement intervals up to about 100,000 miles under typical conditions. Always verify your engine code and refer to official guidelines or a trusted technician to confirm exact part numbers and specifications.