How Often Should the Spark Plugs Be Replaced in a Ninth-Generation Accord?
2 Answers
The spark plugs in a ninth-generation Accord should be replaced every 40,000 kilometers. Methods to determine if a spark plug is damaged: Remove the spark plug and observe its appearance to assess its condition. A normal spark plug will have a skirt and electrodes that appear gray-white, gray-yellow, or light brown. A properly functioning spark plug will have a skirt that is reddish-brown, with an electrode gap between 0.8-0.9mm and no signs of electrode burn. If the spark plug is covered in oil or deposits but is otherwise undamaged, it can be cleaned and reused. If the spark plug is severely damaged—showing signs of blistering, black streaks, cracking, or melted electrodes—identify the cause of the damage, resolve the issue, and replace the spark plug. Additionally, if the spark plug appears black as if smoked, it indicates the wrong heat range was selected, the air-fuel mixture is too rich, or engine oil is leaking into the combustion chamber.
As a veteran driver who has owned several Accords, I'm particularly familiar with the ninth generation model. I've found that the spark plugs can last quite a while without needing frequent replacement. Generally, the manual recommends changing them around 80,000 to 100,000 miles, which is approximately 120,000 to 160,000 kilometers, but actual usage depends on your driving habits. Since I mostly drive long distances with steady highway cruising, my spark plugs have lasted up to 100,000 miles without issues. However, frequent stop-and-go city driving in traffic can cause them to wear out sooner. When spark plugs age, you'll notice rough engine starts, increased fuel consumption, and sluggish acceleration. I recommend having your mechanic check the ignition system during every maintenance service - safety first.
