The spark plug gap for the 2008 Honda Odyssey with a 3.5-liter V6 is typically 0.043–0.047 inches (about 1.09–1.19 mm).
For the 2008 Odyssey’s 3.5 L V6 (J35A), maintaining the correct gap is important for efficient combustion, smooth idle, and good fuel economy. While OEM plugs generally use this range, always verify the exact gap recommended for the specific plug model you install, especially if using aftermarket iridium or platinum plugs.
Gap specification
The official specification for most engines in this family specifies a gap of 0.043–0.047 inches (1.09–1.19 mm). This range is commonly applied to OEM and many aftermarket plugs used in the 3.5 L V6, but always confirm with the plug maker’s data for your chosen part.
To help you understand how to verify or adjust the gap, consider the practical steps below.
To help you check or adjust spark plug gap correctly, use the following steps:
- Prepare tools: a spark plug socket, a torque wrench, and a feeler gauge that covers 0.039–0.060 inches (0.99–1.52 mm).
- Confirm plug type and gap: verify the recommended gap for your chosen plug model (commonly 0.043–0.047 in for the 3.5 L J35A engine).
- Inspect the plugs: remove old plugs or inspect pre-installed ones for damage; replace if threads are damaged or electrodes are worn.
- Measure and adjust gap: use a suitable feeler gauge to measure the gap; if outside the 0.043–0.047 in range, adjust by gently bending the ground electrode ends or by using the gap tool to bring to spec. Do not pry or bend the center electrode if it is a platinum or iridium design beyond the designed bend location (be careful).
- Reinstall with proper torque: torque the plugs to around 13 ft-lbs (18 N·m) after a light seat; do not over-tighten to avoid thread damage.
- Verify function: reinstall connectors, run engine and check for smooth idle and absence of misfires.
Concluding: The gap specification for the 2008 Honda Odyssey 3.5 L is 0.043–0.047 inches (1.09–1.19 mm). Use the specified gap for the plug you choose and torque correctly to ensure reliable combustion and longevity.
Summary
Short answer: The spark plug gap is 0.043–0.047 inches (1.09–1.19 mm). For routine maintenance, confirm the gap for the exact plug model you install and torque to about 13 ft-lbs (18 N·m). Always consult the service manual or the plug manufacturer's specifications for any variations tied to aftermarket parts.