What is the spark plug torque spec for a 2009 Acura TSX?
The spark plug torque specification for the 2009 Acura TSX is 13 ft-lbs (18 N·m).
In this article we outline the official torque value, why it matters for the 2.4-liter K-series engine used in the TSX, and practical steps for installing plugs correctly. We’ll also cover plug types and common installation considerations to help you get it right the first time.
Official torque specification and context
The standard torque for spark plugs on the 2009 TSX’s 2.4L K-series engine is 13 ft-lbs (18 N·m). This target applies to OEM plugs and many aftermarket equivalents designed for the same thread size and heat range. Exceeding this torque can risk head or thread damage, while under-torquing can lead to poor sealing and heat buildup.
Note: Plug gap and thread condition matter too. Always verify the gap for the specific plug model you install and ensure threads are clean and dry before tightening.
Installation steps
Follow these steps to install spark plugs to the correct torque, with proper preparation and safety.
- Disconnect the negative battery terminal and, if present, remove any engine covers to access the coil-on-plug assemblies.
- Carefully disconnect the ignition coils and set them aside in a safe area to access the spark plugs.
- Inspect the spark plug wells and threads; clean any debris from the head using compressed air if needed.
- Check the gap on the new plugs according to the plug manufacturer’s specification (verify the exact gap value for your chosen plug).
- Thread the plugs by hand to avoid cross-threading, then tighten with a torque wrench to 13 ft-lbs (18 N·m).
- Reconnect the ignition coils, reassemble any components you removed, reconnect the battery, and start the engine to verify proper operation.
Concluding: Adhering to the 13 ft-lbs (18 N·m) torque specification helps ensure a proper seal and reliable ignition performance. Avoid overtightening to prevent thread damage.
Plug types and additional considerations
While the torque target remains 13 ft-lbs (18 Nm) for the 2009 TSX across common plug types, there are practical installation notes to keep in mind.
- Plug types: Copper, platinum, or iridium plugs used in the K-series engine generally share the same torque target of 13 ft-lbs (18 Nm).
- Anti-seize: Honda/Acura guidance typically discourages applying anti-seize on modern spark plugs, as it can alter the effective seating torque. If a plug requires anti-seize per manufacturer instructions, follow those guidelines and adjust torque accordingly.
- Re-torque check: For first-time replacements or after a long interval, some technicians re-check torque after the initial 60–100 miles to ensure seating has occurred.
Concluding: Use the correct torque and follow plug manufacturer guidance for gaps and any special instructions. If in doubt, consult the official service manual or a certified technician.
Summary
The 2009 Acura TSX’s spark plugs should be torqued to 13 ft-lbs (18 Nm). Use a proper torque wrench, ensure threads are clean, verify the correct plug gap, and avoid overtightening. Most plug types used in the K-series engine share this torque target, but always refer to the plug manufacturer’s instructions and the vehicle service manual for precise guidance.
What is the spark plug gap on a 2009 Acura TSX?
Notes: Ruthenium HX high ignitability spark plug. Gap 0.044". Quantity per car: 4.
What is the torque spec for spark plugs?
The torque spec for spark plugs varies depending on the size and seat type, but a common range for M14 (14mm) spark plugs is about 15−25 ft-lbs15 minus 25 ft-lbs15−25 ft-lbs (20−30 Nm20 minus 30 Nm20−30 Nm), and for M12 (12mm) spark plugs it's approximately 11−18 ft-lbs11 minus 18 ft-lbs11−18 ft-lbs (15−25 Nm15 minus 25 Nm15−25 Nm). Always check your vehicle's service manual for the exact specification.
This video demonstrates how to properly torque spark plugs: 58sToyota MaintenanceYouTube · Sep 22, 2023
General guidelines
This video shows how to torque spark plugs with a torque wrench: 1mPhillips VisionYouTube · Jun 29, 2021
- Consult the service manual: The most accurate information will always be in your vehicle's specific service manual.
- Use a torque wrench: This is the best way to ensure proper tightness, which is crucial for heat transfer and sealing.
- Install by hand first: Always start threading the spark plug by hand to avoid cross-threading.
- Clean threads are key: Ensure spark plug threads are clean and dry to prevent over-torqueing and potential engine damage.
- Anti-seize affects torque: If using anti-seize compound, keep in mind that it can affect the required torque value, so be extra careful to use the correct spec.
Examples by spark plug type
- M14 (Gasket Seat): Approximately 15−25 ft-lbs15 minus 25 ft-lbs15−25 ft-lbs or 20−30 Nm20 minus 30 Nm20−30 Nm.
- M12 (Gasket Seat): Approximately 11−18 ft-lbs11 minus 18 ft-lbs11−18 ft-lbs or 15−25 Nm15 minus 25 Nm15−25 Nm.
- Tapered Seat Plugs: These often require a specific fractional turn after finger-tightening, typically around 1/161 / 161/16 of a turn, instead of a torque value.
This video explains the importance of proper torque for spark plugs: 22sNGK Spark Plugs USAYouTube · Oct 15, 2010
What is the torque spec for spark plugs on Acura TL?
13 lbf.ft (1.8 kgf.m, 18 N.m)
Tighten the spark plugs carefully. A spark plug that is too loose can overheat and damage the engine.
What size socket for TSX spark plugs?
Use the ratchet extension and 5/8" socket to reach the spark plug and loosen it.
