The main role of a spark plug is to produce an electric spark in the engine’s combustion chamber; therefore, when a spark plug is malfunctioning, the effects are often clearly shown by the engine response. This is a good indication that a spark plug needs to be changed.
The most common bad spark plug symptom is rough engine idle. When an engine is idling, it produces an ordinary smooth sound. However, if the engine sounds rough, and the vibration of the vehicle is greater than usual, a driver should inspect the plugs.
Another common symptom of faulty spark plugs is that the engine faces difficulty in starting. Apart from causes, such as running out of fuel or battery power, a faulty or worn spark plug can also cause the engine to have trouble starting. This is because it could not produce the spark needed to ignite the fuel and air mixture.
In addition, an engine misfire issue is also often rooted from a bad spark plug. Due to the faulty spark plug, the engine cylinder is not fired properly,leading to other symptoms, such as poor acceleration and higher fuel consumption. Furthermore, the engine may tend to start and stop suddenly, causing engine surging that can be dangerous when the vehicle is moving in heavy traffic.Learn More
The length of time that spark plugs last depends on the number of miles driven and the type of spark plug a vehicle has installed. Spark plugs are typically changed every 45,000 miles, but some spark plugs are advertised to last as long as 100,000 miles.Full Answer >
A spark plug is a device that produces an electrical spark, which ignites the mixture of fuel and air in the engine's combustion chambers. A spark plug initiates the combustion in the internal combustion engine.Full Answer >
There are a variety of signs of bad spark plugs including difficulty with starting an engine, a rough idle and an increased consumption of gas. Other signs include an engine that has a sudden surge when driving and difficulty with acceleration when applying the gas.Full Answer >
The most common cause of oil fouling on a spark plug is caused by badly worn piston rings or cylinder walls within the automobile's motor. Oil can also be pulled into the chamber because of excessive clearance in the valve stem guides.Full Answer >