What is the torque spec for Toyota 3.5 spark plugs?
The typical torque specification for spark plugs on Toyota’s 3.5-liter V6 engines (the 2GR-FE family) is 18 N·m (13 ft-lb) for most OEM iridium/platinum plugs. Always verify the exact figure for your vehicle’s year, engine code, and plug type in the official service manual or Toyota’s Technical Information System, as variations can occur by market or update.
This article explains the standard torque figure, notes where variations may appear, and outlines how to apply the torque safely during a plug replacement on popular 3.5L Toyota models such as the Camry, Highlander, Avalon, and Sienna.
Engine context
The 3.5-liter V6, commonly referred to as the 2GR-FE, powers a wide range of Toyota models. Spark plugs on this family of engines are accessible from the sides of the engine, typically use 14 mm threads, and the service manual provides the exact torque for each plug type and vehicle application.
Torque guidelines for the 3.5L engine
Before applying the torque, these guidelines help ensure a proper seal and avoid thread damage. Always follow the spec in your manual if it differs.
- Use the correct plug type and thread size specified for your engine and model year. OE iridium/platinum plugs are the common choice for the 3.5L 2GR-FE.
- Apply the specified torque with a calibrated torque wrench. For most OE iridium/platinum plugs on the 2GR-FE, the target is 18 N·m (13 ft-lb). Do not exceed the recommended torque to avoid head or thread damage, particularly on aluminum blocks.
- Do not rely on lubricants or anti-seize on modern spark plugs unless explicitly instructed by Toyota or the plug manufacturer, as these can alter the effective torque.
- After installation, ensure the ignition coils or wires seat properly and there are no signs of misfires or leaks once the engine is started.
These guidelines emphasize proper seating, thermal transfer, and long-term reliability for the 3.5L family across various Toyota models.
Summary
For Toyota’s 3.5L V6 engines (2GR-FE), the typical spark plug torque is around 18 N·m (13 ft-lb) for OEM iridium/platinum plugs. Verify the exact value in your vehicle’s service manual for your year and plug type. Use a torque wrench, avoid overtightening, and follow the manufacturer’s guidance for lubrication or anti-seize if specified. Correct torque helps prevent threaded damage and ensures reliable ignition across Camry, Highlander, Sienna, Avalon, and related models.
