The gap for the most common 2014 Civic engines is 0.043 inches (1.1 mm) for the 1.8-liter variant, while the 2014 Civic Si with the 2.4-liter engine uses a gap of 0.040 inches (1.0 mm). Always verify the exact figure for your specific engine and plug type using the owner’s manual or the spark plug packaging.
Engine variants and their recommended gaps
The 2014 Honda Civic line came with more than one engine option, so the spark plug gap can vary by powertrain. The figures below are the typical OEM-recommended gaps for common configurations.
- 1.8L inline-4 engine (LX, EX, EX-L, and related trims): 0.043 in (1.1 mm).
- 2.4L inline-4 engine (Civic Si): 0.040 in (1.0 mm).
Note that plug type (copper, iridium, or platinum), heat range, and the manufacturer’s recommendations can influence the exact gap. When in doubt, check the plug packaging and the vehicle’s service manual for the precise specification.
How to check and set the spark plug gap
Before adjusting the gap, prepare the tools and ensure you’re working on the correct engine variant. A correctly gapped plug helps prevent misfires and ensures optimal combustion and fuel efficiency.
- Remove the spark plug from the engine and inspect for wear or damage.
- Measure the current gap with a spark plug gap tool or feeler gauge and compare it to the vehicle’s specified gap (0.043 in or 0.040 in, depending on the engine).
- If the gap is out of spec, carefully bend the ground electrode using the gap tool to the correct measurement. Do not bend the center electrode.
- Reinstall the plug, ensuring it is clean and torqued to the manufacturer’s specification. Repeat for any additional plugs if replacing multiple.
Always reinstall with clean threads, use anti-seize or a light coat of antiseize compound if recommended by the plug manufacturer, and torque to the factory specification to avoid overtightening or under-tightening.
Important reminders
Gaps can vary slightly by plug brand and heat range. For example, some NGK or Denso plugs may have a slightly different recommended gap than the OEM copper plugs. Always align the gap to the exact specification printed on the plug box or in the service manual for your engine code and trim.
Summary
In short, the 2014 Honda Civic’s spark plug gap typically is 0.043 inches (1.1 mm) for the 1.8L engines and 0.040 inches (1.0 mm) for the 2.4L Civic Si. Verify the exact figure for your vehicle’s engine and plug type, and follow proper measurement, adjustment, and torque procedures to ensure reliable combustion and engine performance.