will ignition coil stop car starting

by:Haiyan     2023-07-11

Will Ignition Coil Stop Car Starting


The ignition coil is a vital component of a car's ignition system, responsible for providing the necessary spark to ignite the fuel-air mixture in the engine cylinders. Without a functioning ignition coil, a car may experience issues when starting, leading to possible engine failure. In this article, we will explore the role of the ignition coil in a car's starting process and discuss what happens when it fails. Additionally, we will delve into symptoms of a faulty ignition coil and guide you on how to diagnose and replace it if necessary.

Understanding the Ignition Coil

The ignition coil is an essential component that converts low-voltage electricity from the car battery into high-voltage electrical pulses. These pulses, often referred to as sparks, are transmitted to the spark plugs, igniting the fuel-air mixture within the engine. Without these sparks, the engine would not start, resulting in a vehicle that is immobilized.

Subheading 1: Symptoms of a Faulty Ignition Coil

When an ignition coil begins to malfunction, several signs may indicate a problem. Recognizing these symptoms early on can prevent further damage to the engine and save you from costly repairs. Here are some common signs of a faulty ignition coil:

1. Difficulty Starting the Car: When an ignition coil is failing, you may experience difficulty starting your vehicle. It may take several attempts before the engine finally starts, or it may not start at all.

2. Engine Misfires: An ignition coil that is losing its efficiency can cause engine misfires. This occurs when the fuel-air mixture within the cylinders fails to ignite properly, resulting in a rough-running engine or occasional power loss while driving.

3. Stalling and Poor Performance: A faulty ignition coil can also lead to frequent stalling and a significant decrease in the vehicle's overall performance. You may notice reduced power during acceleration or a hesitating engine response.

4. Decreased Fuel Efficiency: If your car's gas mileage suddenly drops, it could be due to a faulty ignition coil. A weak spark produced by a failing coil can result in incomplete combustion, leading to wasted fuel and decreased efficiency.

5. Illuminated Check Engine Light: Modern vehicles are equipped with onboard diagnostic systems that monitor various engine functions. When an ignition coil fails, it often triggers the check engine light on your dashboard. Using an OBD scanner can help you identify the specific issue related to the ignition coil failure.

Subheading 2: Diagnosing a Faulty Ignition Coil

If you suspect that your ignition coil is at fault, it is essential to perform a thorough diagnosis to confirm the issue. Here are the steps to diagnose a faulty ignition coil:

1. Check for Trouble Codes: Begin by connecting an OBD scanner to your car's diagnostic port and retrieve any trouble codes related to the ignition system. These codes will provide further insight into the problem.

2. Conduct Visual Inspection: Inspect the ignition coil visually for any signs of damage, such as cracks or corrosion. Additionally, check for loose connections or frayed wires.

3. Test Resistance: Using a multimeter, measure the resistance between the coil terminals. Consult a repair manual or the manufacturer's specifications for the correct resistance values. If the resistance falls outside the specified range, the ignition coil may be faulty.

4. Perform Spark Test: Disconnect the ignition coil from the spark plug and use a spark tester tool to check for spark generation. If there is no spark or the spark is weak, the ignition coil may need to be replaced.

Subheading 3: Replacing the Ignition Coil

If you have diagnosed a faulty ignition coil and determined it needs to be replaced, here are the steps to follow:

1. Gather Necessary Tools and Materials: Before starting the replacement process, gather the required tools and materials, including a new ignition coil, a socket set, and a screwdriver.

2. Locate and Remove the Old Ignition Coil: Depending on your car's make and model, the ignition coil may be located either on the engine block or attached to the engine firewall. Once located, disconnect any electrical connectors and remove the mounting bolts securing the coil in place.

3. Install the New Ignition Coil: Position the new ignition coil in the mounting location and secure it using the previously removed bolts. Reconnect the electrical connectors, ensuring a snug fit.

4. Test the New Ignition Coil: After replacing the ignition coil, start the engine to verify that the problem is resolved. Check for any abnormal engine behavior and listen for smooth running.


The ignition coil plays a crucial role in a car's starting process, and a faulty coil can lead to significant engine issues. Understanding the symptoms, diagnosing the problem, and replacing the coil when necessary is essential for maintaining a well-functioning vehicle. If you suspect a faulty ignition coil, be sure to consult a professional mechanic for further assistance.

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