Will Replacing Spark Plugs Reduce Fuel Consumption?
2 Answers
Replacing spark plugs can reduce fuel consumption. If a spark plug is damaged, it can directly cause issues such as leakage in the vehicle's ignition system, increased fuel consumption, and reduced power output. The most significant problem is difficulty in ignition, which affects the normal operation of the vehicle. Severe erosion of the spark plug, such as scarring, damage, or melting and erosion of the electrodes, indicates that the spark plug is damaged and should be replaced. Spark Plug Location: Spark plugs are installed on the side or top of the engine. In earlier models, spark plugs were connected to the distributor via ignition cables. Over the past decade, most car engines have been modified to connect the ignition coil directly to the spark plug. Spark Plug Replacement Interval: Under normal maintenance conditions, spark plugs should be replaced every 40,000 to 60,000 kilometers. However, this may vary depending on the brand and engine type. It is recommended to follow the vehicle's manual. Generally, platinum spark plugs should be replaced at 40,000 kilometers, ordinary nickel alloy spark plugs at 20,000 kilometers, and iridium spark plugs at 60,000 to 80,000 kilometers.
I've been in auto repair for over a decade, and replacing worn spark plugs can indeed reduce fuel consumption. When spark plugs age, they don't ignite properly, leading to incomplete combustion and wasted fuel. For example, last time I encountered a car with rough idling and a 20% increase in fuel consumption. Upon inspection, the spark plug electrodes were eroded. After replacing them, the ignition improved, combustion stabilized, and fuel consumption returned to normal. However, this depends on the situation—if the spark plugs are still new, replacing them won't help. Additionally, fuel consumption is also affected by the air filter and driving habits. Aggressive acceleration will still consume more fuel. I recommend regular inspections and replacing spark plugs based on the manual's mileage guidelines or symptoms, such as difficulty starting or weak acceleration. Proper maintenance can save you some fuel costs and prevent other related issues.
