2008 Highlander 3.5 Spark Plug Gap and Torque
2008 Highlander 3.5 Spark Plug Gap and Torque with application table, generation boundaries, verification steps, cautions and official manufacturer lookup.
For the 2008 Highlander 3.5L 2GR-FE, Toyota lists a new-plug reference gap of 1.0–1.1 mm (0.039–0.043 in), a 1.4-mm (0.055-in) maximum used-plug gap and 18 N·m (13 lb-ft) installation torque.
For the 2008 Highlander 3.5L 2GR-FE, Toyota lists a new-plug reference gap of 1.0–1.1 mm (0.039–0.043 in), a 1.4-mm (0.055-in) maximum used-plug gap and 18 N·m (13 lb-ft) installation torque.
This exact row covers the 2008 Highlander 4WD 2GR-FE application. Hybrid service access, later turbo engines and other model years must be checked separately even when a displacement badge appears familiar.
Interactive 2008 Highlander 3.5L specification guide
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Use this visual as an orientation aid. The exact VIN, engine, trim and manufacturer document control the specification.
Toyota Highlander Spark Plug Gap Chart
| APPLICATION / ITEM | SPECIFICATION | NOTES |
|---|---|---|
| New-plug reference gap | 1.0–1.1 mm | 0.039–0.043 in |
| Used-plug maximum | 1.4 mm | 0.055 in; inspection limit |
| Installation torque | 18 N·m | 13 lb-ft |
| Engine | 3.5L 2GR-FE | 2008 Highlander 4WD |
The used-plug maximum is an inspection limit, not a target for opening a new plug. Match the Toyota-approved part number and follow its fine-wire electrode handling instructions.
New-plug reference versus used-plug limit
Toyota provides two different measurements in this 2GR-FE row. The new-plug reference is 1.0–1.1 mm, while 1.4 mm is the maximum used-plug gap. Treating 1.4 mm as a setup target would intentionally install an over-wide gap.
Fine-wire plugs should be inspected without striking the center electrode. Replace cracked, contaminated or excessively worn plugs and keep the approved part numbers together as a set; gap alone does not establish heat range or reach.
Access and installation on the transverse V6
The rear bank's restricted access can turn a simple measurement into an intake-component service. Follow the exact removal procedure, protect open ports and replace any gasket or single-use item the manual identifies rather than forcing tools between components.
Hand-start all six plugs and use the cited 18-N·m torque on the specified thread condition. Reconnect vacuum hoses, electrical connectors and intake seals methodically; a post-service lean code may come from an air leak rather than from the new plugs.
Application boundaries for 2008 Highlander 3.5L
This exact row covers the 2008 Highlander 4WD 2GR-FE application. Hybrid service access, later turbo engines and other model years must be checked separately even when a displacement badge appears familiar.
The used-plug maximum is an inspection limit, not a target for opening a new plug. Match the Toyota-approved part number and follow its fine-wire electrode handling instructions.
Toyota 2008 Highlander 3.5L specifications can change by model year, engine, platform, wheel, and installed component. Confirm the VIN or engine identity, part numbers, fastener condition, and the current manufacturer instructions before service.
Procedures used with this specification
These steps are the same for every vehicle in this family, so they are documented once rather than repeated on each page. The values above remain specific to this Toyota 2008 Highlander 3.5L.
2008 Highlander 3.5 Spark Plug Gap and Torque FAQs
What is the new spark plug gap for a 2008 Highlander 3.5L?+
Toyota lists 1.0–1.1 mm, or 0.039–0.043 inch, as the new-plug reference.
What does the 1.4-mm figure mean?+
It is the maximum electrode gap for a used plug, not the setting for a new plug.
What is the 2008 2GR-FE spark plug torque?+
18 N·m, equal to 13 lb-ft, in the cited service data.
Can this gap be used for a later turbo Highlander?+
No. This answer is scoped to the 2008 3.5L 2GR-FE application.
Technical sources
TorqueSheet favors engine- and component-specific manufacturer instructions over unsourced universal values.
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