Spark Plug Gap Chart by Vehicle (2000–2026)

There is no single universal gap. Modern naturally aspirated engines typically specify 0.040" to 0.044" (1.0 to 1.1 mm), whereas high-boost turbocharged engines run tighter gaps between 0.028" and 0.032" (0.7 to 0.8 mm). Always check your exact vehicle specification in this database.

A gap that is too wide increases electrical resistance. The ignition coil must generate elevated voltage to jump the gap. Under heavy acceleration or boost, the spark can be extinguished (spark blowout), causing hesitation, severe misfires (P0300), and premature ignition coil failure.

A gap that is too narrow creates a physically smaller spark with reduced exposure to the air-fuel mixture. This leads to a weaker flame kernel, incomplete combustion, unburnt fuel emissions, carbon fouling on the electrodes, and poor fuel efficiency.

Coin-style ramp tools pry directly against the center electrode. Precious metal plugs (iridium, platinum, ruthenium) feature an ultra-fine wire center electrode as thin as 0.4mm to 0.6mm. Forcing a ramp tool against this tip can easily fracture or shear the precious metal welding, destroying the plug.

While pre-gapped at the factory, shipping vibrations and box handling can shift the ground strap. Furthermore, a single plug part number often fits multiple engine families with differing gap requirements. Always check with a flat feeler gauge before final installation.

Most modern vehicles with aluminum cylinder heads specify between 11 and 18 ft·lb (15 to 25 N·m) of torque. Overtightening damages the soft aluminum threads, requiring expensive Timesert or Heli-Coil repairs. Always torque dry into clean cylinder head threads.