Ignition coils are parts of a vehicle’s ignition system, responsible for transforming low-voltage electrical power from the battery into high-voltage power needed to spark the spark plugs.
This spark is important for igniting the air-fuel mixture in the engine’s combustion chambers, initiating the combustion process that powers the engine.
Over time, the ignition coils can go bad and need a replacement. Once the replacement is successfully done, there are several important tasks you must do to complete the replacement process. So what are they? What should you do after changing ignition coils?
What to Do After Changing Ignition Coils
Here’s what to do after changing your ignition coils in your car:
1. Check the Installation
The first thing to do after changing your ignition coils is to look back and inspect the installation process to ensure that the coils are properly tightened with the torque needed to keep them working.
You should also ensure that all electrical components such as the wires attached to the coils are properly connected correctly.
If you lose other engine components such as the cold air intake, mass air flow sensor, etc., to be able to replace the coils, ensure they are properly installed the right way it should to avoid having other engine-related problems. This is very important.
2. Inspect Spark Plugs
After changing ignition coils, it’s important to inspect and, if necessary, replace the spark plugs. This is what you should probably do while replacing the coils rather than after replacing them.
Ignition coils and spark plugs work in tandem to ignite the air-fuel mixture in the combustion chamber. Worn-out spark plugs can compromise the effectiveness of the new ignition coils, hindering overall engine performance.
So, checking the spark plugs to be sure it’s working well can help maximize the efficiency of the newly installed coils. You never can tell. You may end up finding fouled spark plugs that need cleaning or replacement.
3. Check for Fault Codes and Perform a Reset
The second important thing to do after changing ignition coils is to check for error codes left in the car’s computer by the replaced coils.
You should use an OBD-II scanner to check the codes stored in the vehicle’s computer system and clear them. This is to allow the car’s ECU to start using information from the new coil.
Also, some vehicles benefit from an Electronic Control Unit (ECU) reset after significant changes, such as replacing ignition coils.
This process can help the ECU adapt to the newly replaced component and optimize engine performance. If you don’t have an OBD-II scanner, then disconnect the battery for 15 minutes and reconnect it back.
4. Perform a Test Drive
Take your vehicle for a test drive to assess the impact of the new ignition coils on overall performance. Pay attention to acceleration, smoothness, and fuel efficiency. If you notice any irregularities or hesitation, further investigation may be required.
5. Monitor Fuel Consumption
Keep an eye on your car’s fuel consumption after changing ignition coils. Improved ignition coil efficiency should contribute to better fuel combustion, resulting in increased fuel efficiency.
If you notice a sudden drop in fuel economy, it may indicate additional issues that need attention.
6. Evaluate Engine Smoothness
A well-functioning ignition system should contribute to a smoother-running engine. Pay attention to any vibrations, rough idling, misfires, or poor acceleration. If you encounter these issues, it could be a sign of a lingering problem or a need for fine-tuning.
7. Check Battery Voltage
After replacing the ignition coils, it’s good to check your battery voltage. Confirm that your car’s battery is in good condition and maintaining the appropriate voltage.
Ignition coils rely on a steady power supply, and a weak or failing battery can affect their performance. However, replace the battery if it shows signs of degradation.
Car Shakes After Changing Ignition Coil
If you start to experience engine shaking or vibrations after changing an ignition coil, it could be indicative of several issues such as:
- Faulty Ignition Coil: Even though you’ve replaced the ignition coil, there may still be an issue with one or more of the new coils. Check if the replaced coils are functioning correctly and ensure they are compatible with your vehicle. This has happened to me in the past and it happened that the new coils I purchased were fake.
- Bad Spark Plugs: Ignition coils work in conjunction with spark plugs to ignite the air-fuel mixture in the engine. If the spark plugs are old, fouled, worn out, or incompatible with the new ignition coils, it can lead to misfires and engine shaking. Ensure that the spark plugs are in good condition and properly gapped.
- Incorrect Installation: If the new ignition coil is not installed correctly or if there are loose connections, it can result in poor electrical contact, leading to misfires and engine vibrations. Double-check the installation to ensure all components are securely in place.
- Vacuum Leaks: Vacuum leaks can cause irregular combustion and lead to engine shaking. The process of changing ignition coils may have inadvertently disturbed vacuum hoses or components. Inspect the vacuum system for leaks and fix any issues.
- Fuel Delivery Issues: Inadequate fuel delivery or a malfunctioning fuel injector can contribute to engine misfires and shaking. Check the fuel injectors and fuel system for proper functioning, and ensure there are no clogs or leaks.
- Timing Issues: Timing plays an important role in engine performance. If the timing is off, it can lead to misfires and shaking. Ensure that the ignition timing and camshaft/crankshaft timing are correctly set according to your vehicle’s specifications.
- Engine Control Unit (ECU) Adaptation: After changing ignition coils, the Engine Control Unit (ECU) may take some time to adapt to the new components. Consider driving the vehicle for a short period to allow the ECU to adjust to the changes. If the shaking persists, there might be an underlying issue that needs further investigation.
- Other Mechanical Issues: It’s also possible that the shaking is unrelated to the ignition coil replacement. Check other components such as the exhaust system, engine mounts, and the overall condition of the engine for issues.
Can I Replace the Ignition Coil Myself?
Yes, you can change the ignition coil yourself if you have the mechanical skills and the right tools. If you’re comfortable with basic car repairs and have the necessary equipment, you can attempt the replacement yourself following proper safety guidelines and your vehicle’s manual.
Also, there may be tons of YouTube videos to aid with the replacement. With the right tools and a little mechanical knowledge, you can successfully replace the coils yourself.
Why Won’t My Car Start After Replacing the Ignition Coils?
If your car won’t start after replacing the ignition coil, it could be a result of a faulty ignition coil or improper installation.
If you perform the replacement with a fake new ignition coil or if the replacement process is not properly done, it will affect the car’s ignition system and cause the car not to start.
You must perform the replacement with original ignition coils and ensure the installation is properly done by checking the electrical connections are secure, and inspecting related components like spark plugs.
Conclusion
Changing ignition coils is a positive step toward maintaining a healthy and efficient engine. However, there are certain important things you must do after changing your coils such as inspecting the spark plugs, clearing the error codes caused by the old coil, and resetting the ECU to adapt to the new coils.
Doing this will help ensure that your efforts result in optimal performance, improved fuel efficiency, and a smoother driving experience.
