It presents oil leaking in the engine and reaching to valve sealings and another components.
Dry: When the end of the spark plug is dry and sandy it is not a good sign. Evenly Worn-Out Electrodes: Worn-out electrodes with no deposit or debris represents normal engine condition. This coolant is steam cleaning the spark plug and making it spotless. Clean Plug: A completely clean and spotless spark plug shows coolant leakage in cylinders. Black and Dry: A black and dry spark plug represent a leaky fuel injector or fuel control problem. It does not represent any alarming engine condition. Worn-Out Electrode: It is common that electrodes get worn out. Different conditions of spark plug elaborating the engine’s condition Image Credit: YouTube (MotorWeek) Here we have mentioned a few spark plug conditions and what they denote about engine health. It is often used by professionals to gauge the current engine condition. Inspecting a Faulty Spark PlugsĪ faulty spark plug can elaborate a lot about the engine and its component’s health. Generally slow or no acceleration is felt due to a faulty spark plug. When spark plugs fail to combust properly less energy is generated which creates a negative impact on acceleration. Spark plugs are responsible for combusting fuel and generating energy to run petrol or diesel engines. Therefore, either you hear engine knocking or misfiring. The unburnt mixture catches fire and detonates when the piston is at the opposite position. It happens when spark plugs fail to combust air and fuel ratio properly. You can witness engine knocking and misfire usually during acceleration. Spark plug failure symptoms also include engine misfiring and knocking. Check plug light will illuminate on dashboard to notify problem in spark plug Engine Knocking and Misfiring It will also create a car backfire leading to cuts providing an uncomfortable driving experience. Modern cars have self-fault detection technology that can identify malfunctioning spark plugs. Illuminating Engine LightĪn engine warning light will illuminate immediately to indicate a faulty spark plug. The presence of these pollutants in the chamber also causes car exhaust to emit black or different color smoke. Old spark plugs start passing the deposited debris inside the combustion chamber which creates an impact on fuel-burning efficiency. A bad spark plug can decrease your fuel economy by 30%. It is the most common side effect of bad spark plugs. Problem in car ignition caused by a bad spark plug Lower Fuel Economy Moreover, it will also cause the engine to idle due to differences in cylinder position and spark. Due to this, the car starts for a second then dies and requires multiple attempts to start properly. Worn-out and malfunctioning spark plugs have problems in creating enough spark to ignite the mixture inside the combustion chamber. Trouble in Car IgnitionĪ faulty spark plug can cause ignition switch problems. Here is the list of symptoms that represent a bad spark plug. It is sensitive to debris and starts malfunctioning when affected by dirt or debris built-up. Spark plugs are counted among engine components that require proper maintenance and care. In this guide, we have enlisted some of the common bad spark plug symptoms that will help in diagnosing the issue more conveniently. 
Not replacing or ignoring the symptoms can cause a number of issues in the smooth functioning of a car. Therefore, faulty spark plugs start showing symptoms at an early stage. The spark plugs are used to ignite air and fuel mixture inside the combustion chamber.
Spark plugs play a critical role in the working of internal combustion engines.
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