What Is the Spark Plug Gap on a 2008 Honda Accord 3.5 V6?
It’s 0.043 inches (1.1 mm). The 2008 Honda Accord with the 3.5-liter V6 (J35 series) uses fine-tip iridium spark plugs that are factory pre-gapped to 1.1 mm, and Honda advises not to adjust the gap. If you’re installing new plugs, verify they match the OEM spec and avoid bending the electrodes, as doing so can damage the iridium tip and shorten plug life.
Contents
Factory Specification and Recommended Plugs
Honda’s specification for the 2008 Accord V6 calls for a spark plug gap of 1.1 mm (0.043 in). The commonly specified OEM-equivalent plugs are NGK IZFR6K11 and Denso SKJ20DR-M11—note the “11” suffix indicates the 1.1 mm gap. These plugs are designed to be installed as-is without regapping.
Acceptable Range and Why It Matters
While the factory target is 1.1 mm, an operational range of roughly 1.0–1.1 mm (0.039–0.043 in) is generally acceptable. Excessive gap can lead to misfires under load, while a smaller-than-spec gap can reduce combustion efficiency and increase emissions. Using the correct, pre-gapped iridium plug ensures reliable ignition and optimal fuel economy.
Installation Notes and Best Practices
If you choose to check the gap, use a wire-style gauge, not a coin/feeler wedge that can damage the fine-wire center electrode. Do not pry on the center electrode. If a plug is visibly out of spec, replace it rather than attempting adjustment. Install into a cool aluminum head and torque to approximately 13 lb-ft (18 N·m) with a new crush washer. A small dab of dielectric grease inside the coil boot can aid future service; avoid anti-seize on plug threads unless the plug maker specifies it, as it can alter torque readings.
Where to Verify the Spec
You can confirm the gap and plug type in the owner’s manual, the under-hood emissions/engine label, or parts catalogs from NGK/Denso using the exact vehicle details (year, model, engine). Matching the plug’s part number suffix helps ensure the correct factory gap and heat range.
Summary
The correct spark plug gap for a 2008 Honda Accord 3.5 V6 is 0.043 in (1.1 mm). Use OEM-spec iridium plugs (e.g., NGK IZFR6K11 or Denso SKJ20DR-M11), avoid adjusting the factory gap, and torque to about 13 lb-ft (18 N·m) for reliable performance and longevity.
What is the spark plug gap on a Honda 3.5 V6?
0.044″
6 pc NGK Laser Iridium Spark Plugs for 2008-2017 Honda Accord 3.5L V6
| Year Range | Make | Notes |
|---|---|---|
| 2014 | Honda | 3.5L V6 |
| 2015 | Honda | 3.5L V6;Gap 0.044″;Actual Oe Manufacturer |
| 2016 | Honda | 3.5L V6;Gap 0.044″;Actual Oe Manufacturer |
| 2017 | Honda | 3.5L V6;Gap 0.044″;Actual Oe Manufacturer |
What is the torque on spark plugs for Honda 3.5 V6?
If I was really revving the engine all the way out.
What is the gap on the spark plug for a Honda Accord?
The recommended spark plug gap for most Honda Accords is 0.044 inches (1.1 mm). It’s crucial to verify the gap before installing new spark plugs, as it can affect engine performance and fuel economy.
This video explains the spark plug gap for different Honda Accord models: 1mMotor MavYouTube · Feb 16, 2023
Elaboration:
- Importance of Proper Gap: The spark plug gap is the distance between the electrode and the ground terminal. If the gap is too wide, it can cause misfires, loss of power, and poor fuel economy. If it’s too narrow, it can also lead to misfires, especially under load.
- Checking the Gap: Use a feeler gauge to measure the gap. If the gap is incorrect, you can carefully adjust it by gently bending the ground electrode.
- Specific Models and Recommendations: While 0.044 inches is a common spec, it’s always best to consult your owner’s manual or a reliable parts source, like AutoZone or NGK Spark Plugs, to confirm the exact gap for your specific Honda Accord model and engine.
- Example: For the 2018 Accord 2.0T, the recommended gap is 0.044 inches (1.1 mm).
You can watch this video to see how to check the spark plug gap: 1mHerr KutzYouTube · Jan 23, 2021
Are Honda NGK spark plugs pre-gapped?
Although the NGK factory will set the gap to a preselected setting, this may not be the right gap for your particular engine. The incorrect plug gap for your engine can contribute to a high rate of misfires, loss of power, plug fouling, poor fuel economy and accelerated plug wear.
