How many spark plugs does a 2005 Acura TSX have?
The 2005 Acura TSX has four spark plugs—one for each cylinder of its four-cylinder engine.
Engine configuration and spark plug layout
The 2005 TSX uses Honda’s 2.4-liter inline-four K-series engine (K24A4/K24A3 family). As a four-cylinder powerplant, it relies on four spark plugs, with one plug installed per cylinder. The ignition system typically uses four coil-on-plug units mounted on the valve cover, providing a dedicated coil for each spark plug.
Coil-on-plug ignition
In this setup, each cylinder has its own ignition coil directly above the spark plug. This arrangement improves ignition reliability and simplifies wiring compared with older distributor-based systems.
Maintenance considerations
When servicing ignition components, you generally replace all four spark plugs at the same time, unless a specific diagnosis suggests otherwise. Replacement intervals depend on the type of plugs installed (copper vs. iridium/platinum) and driving conditions. For iridium or platinum plugs, Honda-suggested intervals on K-series engines often extend to around 100,000 miles or more; copper plugs typically require more frequent changes. Always consult the owner's manual or a dealer for the recommended interval for your exact plug type.
Why this matters for owners
Knowing there are four plugs helps you budget maintenance and identify the correct parts. If you notice misfires, rough idle, or reduced fuel economy, a plug or coil issue could be involved, and a professional inspection should cover all four cylinders.
Summary
In short, the 2005 Acura TSX features four spark plugs—one per cylinder—with a coil-on-plug ignition arrangement. Replacement intervals vary by plug type and driving conditions, so refer to the owner's manual for the exact interval.
