The spark plug gap for a 2008 Honda Fit is 0.043 inches (1.1 millimeters). This figure comes from Honda's service guidance for the 1.5-liter i-VTEC engine used in that year. The article below explains the spec, how to verify it, and practical steps for replacing plugs correctly.
Official specification
For the 1.5L i-VTEC engine in the 2008 Fit, Honda recommends a spark plug gap of 0.043 inches (1.1 mm). This gap helps ensure reliable ignition, good fuel economy, and smooth engine performance. When installing or gapping aftermarket plugs, set or verify the gap to 0.043 in (1.1 mm) unless the plug manufacturer's instructions specify a different value for that plug type. Always confirm with the specific plug brand you are using.
How to check and adjust the gap
To verify the gap on your 2008 Honda Fit and adjust if needed, follow these steps:
- Gather tools: spark plug gap gauge (feeler gauge), the correct spark plugs, and a torque wrench or driver for installation.
- Safety first: disconnect the battery's negative terminal and ensure the engine is cool.
- Remove one spark plug at a time to avoid mixing up cylinder order; clean around the plug well.
- Measure the gap with the gauge and compare to 0.043 inches (1.1 mm).
- If the gap is too small, carefully widen the inner electrode with the appropriate gap tool; if too large, gently bend the side electrode back until the gauge fits at 0.043 inches.
- Reinstall the plug and torque to the factory specification, then reinstall ignition coils or wires.
Note: Some plugs are pre-gapped by the manufacturer and should be installed as-is; others may require minor adjustment. If in doubt, replace with new plugs that come pre-gapped to spec and verify with a gauge.
Plug types and practical considerations
Common options include copper-core, platinum, and iridium plugs. Regardless of material, the target gap for the 2008 Fit remains 0.043 inches (1.1 mm). Premium plugs often retain the same gap but may come pre-gapped and require no adjustment; always check the manufacturer's instructions and Honda's guidelines. Avoid over-tightening and ensure proper sealing to prevent compression leaks.
Why the gap matters
The spark plug gap affects ignition timing, flame kernel growth, and overall combustion efficiency. An incorrect gap can lead to misfires, reduced power, stiffer acceleration, and lower fuel economy. Keeping the gap at the factory spec helps the engine run as designed by Honda.
Summary
For a 2008 Honda Fit, the recommended spark plug gap is 0.043 inches (1.1 mm). Verify and adjust with a feeler gauge when replacing plugs, and follow the plug maker’s instructions for any deviations. Using the correct gap supports optimal ignition, performance, and efficiency of the 1.5L i-VTEC engine.