Six spark plugs in total—one for each cylinder in the 3.0-liter V6 engine.
The Accord's 3.0-liter V6 uses a coil-on-plug ignition system with six individual ignition coils, so maintenance typically involves replacing all six plugs at the same time to keep the engine firing evenly.
Engine architecture and ignition setup
The 2008 Accord's V-6 is a 3.0-liter J-series engine (J30A) with dual overhead cams, 24 valves, and i-VTEC on most versions. Each cylinder receives its own ignition coil mounted directly atop the spark plug (coil-on-plug), which means six spark plugs in total.
The layout supports efficient combustion and easy diagnostics during routine service. Mechanics typically replace all six plugs in a single service interval to maintain even performance across the engine.
What to know about spark plugs in this model
Before examining the details, here are the essential points about the spark plugs in this engine:
- Six spark plugs total, one per cylinder in the six-cylinder V6.
- Coil-on-plug ignition with six individual ignition coils, each paired with a spark plug.
- Common replacement interval is around 105,000 miles when using iridium or platinum plugs, but always confirm with the owner's manual or dealer service bulletin—intervals can vary by plug type and maintenance history.
- Recommended plug types for longevity typically include iridium or platinum variants, chosen for durability in modern engines.
In practice, owners often reach the 100,000-mile mark before replacement, and many owners choose to replace all six plugs in one session to maintain balanced performance across the cylinders.
Maintenance considerations and symptoms
If the engine starts exhibiting signs of worn spark plugs, such as rough idle, misfires, reduced fuel efficiency, or sluggish acceleration, a spark plug inspection or replacement is a prudent step as part of routine maintenance.
Common symptoms of worn spark plugs
- Rough idle or misfires, especially under load
- Reduced power and acceleration
- Decreased fuel economy
- Difficulty starting or continued engine hesitation
Professional diagnosis and replacement should be performed by qualified technicians to ensure the ignition system remains properly calibrated with the engine control unit (ECU).
Summary
Bottom line: the 2008 Honda Accord V-6 houses six spark plugs—one for each cylinder in its 3.0-liter V6—set up with a coil-on-plug ignition system. Regular maintenance involves replacing all six at the recommended interval to preserve smooth operation, efficiency, and power.