What is the normal gap for spark plugs?
2 Answers
Spark plug normal gap is generally 0.6~1.3 mm. Spark plug replacement procedure: Open the hood, lift the engine's plastic cover, remove the high-voltage distributor wires, and mark each cylinder's position to avoid confusion. Use a spark plug socket to remove the spark plugs one by one. When removing them, check for external debris like leaves or dust and ensure thorough cleaning. Place the new spark plug into the spark plug hole, hand-tighten it for several turns, then use the socket to tighten it further. Reinstall the removed high-voltage distributor wires according to the firing order, then snap the cover back into place. Spark plug replacement interval: Under normal maintenance conditions, replace every 40,000~60,000 km. However, this may vary depending on brand and engine type, so always refer to the owner's manual. Platinum spark plugs should be replaced at 40,000 km, standard nickel alloy spark plugs at 20,000 km, and iridium spark plugs at 60,000-80,000 km.
As a car owner who frequently does DIY maintenance, I have plenty of experience with spark plug gaps. For most family sedans, the ideal gap is between 0.7 and 1.0 millimeters – older cars may require slightly smaller gaps, while newer models might need larger ones. I always use a feeler gauge to check the gap before installing new spark plugs. Just last week, I adjusted the gap on my Toyota with 80,000 kilometers – the factory setting was 0.8mm, but it had widened to 1.1mm, no wonder it was coughing during cold starts. Too small a gap can lead to carbon buildup, while too large a gap causes unstable ignition. I recommend checking the gap every 50,000-60,000 kilometers – it takes just ten minutes but can prevent embarrassing roadside breakdowns.
