How to change the ignition coil of a car? (2022)

9 Min Read
Ignition coil of a car

The ignition coil is a component of the engine that is of the utmost significance. If there is a problem with this component, it could immediately impact how the engine works.

It is essential to locate the issue and make the necessary adjustments as soon as possible.

Ignition coil of a car

This post will explain how to change the ignition coil and will highlight the particular parts that require your attention.

The ignition coil and the role it plays in the functioning of the engine

The ignition coil functions in the vehicle as a kind of transformer and is responsible for the ignition of the fuel.

It supplies the necessary high voltage, transmitted along the ignition wires to the spark plugs, sparks the combustion process, and begins the cycle.

The number of ignition coils installed in an engine is variable according to the automobile’s make and model of the car.

In more recent automobiles, for instance, a single ignition coil may be in charge of two cylinders, or it may even be responsible for a single cylinder alone. Because of this, it is even more challenging to pinpoint the source of a faulty or defective coil.

How is an ignition coil put together?

An ignition coil is made up of two wires that are wound in a different pattern around a laminated iron core.

When there is a flow of electric current through the primary and secondary windings of the ignition coil, there is a development of an electromagnetic field within the cring

It is possible to generate the high ignition voltage of approximately 30,000 volts in this manner, which is both desired and required for the process.

If the coil sustains any damage, it will no longer be possible to carry out this process. Due to the failure to achieve the required ignition voltage, the coil-activated spark plugs are unable to ignite the gasoline.

Indications that there is a problem with the ignition coil

Finding a faulty ignition coil is frequently not as simple as one might hope. However, a wide variety of warning signs indicate that the engine’s ignition coils are broken.

Some instances of these symptoms include the following:

– The vehicle will not start correctly. This indicates that the ignition process does not always work perfectly on the first try.

-It seems as though the engine is not running correctly, and it makes strange noises. Check for any changes in the way the engine is making noises regularly.

-On the dashboard, the warning light for the engine, also known as the check engine light, illuminates.

Why does an ignition coil become less effective over time?

Ignition coils are another vehicle component that is subject to wear and tear. Spark plugs will eventually wear out if they are subjected to consistent use and resistance.

The greater the number of miles put on the vehicle, the greater the likelihood that the car will have a problem with the ignition coil.

On the other hand, a faulty voltage supply or moisture can also cause long-term damage, which can ultimately fail.

Do you make your adjustments at home or in a workshop?

In most cases, it is not necessary to bring the car to a shop to change the ignition coil.

It is up to you to decide, considering that replacing the ignition coil does not take a lot of time and that the components can typically be reached without much difficulty.

Even a repair shop like a garage can’t get away with charging too much for this work. If you have the replacement ignition coil on hand, you can save significant money.

This is an excellent way to save a little money, provided you are brave enough to perform the replacement at home.

Performing each step of the ignition coil replacement in order

The procedure for replacing something may be different depending on the manufacturer.

The fundamental steps, on the other hand, are standard across all brands and varieties of the product.

Since you will be working on the vehicle’s electrical system, you should always ensure that the battery is completely disconnected from the power circuit.

The engine cover has been taken off at this point. You may need specialized equipment, but that depends on the car.

Taking the wires off of the ignition coil is the first step. If required, you should label the wires or take a picture of the cables on the ignition coil.

Now unscrew the ignition coil and take it out of the car.

– Install the replacement coil

– You can stuff the coil

– You need to reattach the wires. Check to see where the cables are positioned. It is essential to pay close attention to the specific configuration of the wires on the ignition coil.

– Fasten the engine cover to the engine

– Make sure the battery is reconnected.

– Verify the engine’s proper operation.

The engine should start immediately and operate with a great deal less jerkiness. You should be able to tell from the sound itself whether or not all of the cylinders start up and whether or not the adjustment was successful.

How to change the ignition coil of a car

When you are replacing the ignition coil, you must pay attention to the following:

Even though changing the ignition coil might appear to be a straightforward and uncomplicated process, you should pay attention to the following essential points:

Always ensure that you have disconnected the vehicle’s battery when working on the car’s electronic system.

Batteries, the ignition distributor, and spark plugs are all connected to the ignition coils. Make sure to mark all of the contacts carefully.

Errors in the connections can result in the cylinder not firing correctly, which means the mixture of gasoline and air cannot be ignited. Attempts to fix the problem by replacing the coil will be fruitless in this scenario.

Please use the opportunity to either mark the connections with a marker or take pictures of the ignition coil while it is still installed and all the wires are connected. In this manner, you will avoid becoming confused.

Important: There is no requirement that both of the ignition coils be replaced at the same time. In contrast to spark plugs, coils are easily replaceable individually.

However, this does not apply if your vehicle’s manufacturer is already aware of any known flaws in the car. If this is the case, it is in your best interest to replace all of the ignition coils so that you do not need to make any additional repairs in the future.


The ignition coils themselves do not come at an exceptionally high cost.

A new ignition coil can cost anywhere from 60 to 180$, depending on the make and model of the vehicle as well as the manufacturer.

Even if everything is changed, replacement costs won’t exceed what is considered reasonable.

This is primarily because expensive ignition coils are typically used for several cylinders simultaneously, reducing the number of waves in the system.

In addition, the costs associated with going to the workshop are not prohibitive by any means. The labor cost in each seminar can range from sixty to one hundred and fifty euros on average.

A trip to the repair shop is economically justifiable if you either do not wish to replace the ignition coil yourself or are unable to do so.

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