What Causes Increased Fuel Consumption After Replacing Spark Plugs?

[RemingtonLee]

Reasons for increased fuel consumption after replacing spark plugs are as follows: Loose spark plugs: When encountering increased fuel consumption after replacing spark plugs, most car owners tend to blame the spark plugs themselves. However, the real issue is often that the spark plugs were not tightened properly during installation. This can lead to leakage of high-pressure gases, resulting in reduced cylinder pressure. The engine then struggles to perform efficiently, leading to unstable idling or frequent stalling, which naturally increases fuel consumption. In severe cases, this may even damage the engine. Excessive engine oil: During spark plug replacement, if too much engine oil is added for various reasons, it can also cause increased vehicle fuel consumption. Excessive oil can submerge the crankshaft, leading to increased resistance. The engine then requires more power to compensate, resulting in higher fuel consumption. This situation has no direct relation to the spark plugs. Poor quality or incorrect spark plug type: Purchasing inferior quality spark plugs or using spark plugs with incorrect specifications can both lead to increased fuel consumption.