DIY Auto Tune-Up: Mastering the Art of Changing Your Car's Spark Plugs
April 7, 2023
6 min read
Neglecting to change your car's spark plug can lead to unexpected and frustrating breakdowns, leaving you stranded on the side of the road. Not only that, but you'll spend more on gas as your car's performance decreases.
A new spark plug will improve your car's fuel efficiency, increase the engine's performance, and extend the life of your car's engine. In addition, it's an easy and inexpensive maintenance task that can save you money in the long run and prevent you from being stranded on the side of the road. So, don't neglect your car's spark plug; change it as part of your regular maintenance routine.
When To Change Your Car's Spark Plugs
Signs That Your Spark Plugs Need Changing
Spark plugs are an essential component of a car's ignition system, responsible for igniting the fuel in the engine. Unfortunately, over time, they wear out and need to be replaced.
Some signs that your spark plugs may need changing include difficulty starting your car, rough idling, reduced acceleration, decreased fuel efficiency, engine misfires, and a noticeable lack of power. If you notice any of these symptoms, it may be time to have your spark plugs checked and replaced by a mechanic.
Importance Of Checking Your Owner's Manual For Recommended Maintenance Schedule
Each car manufacturer has a recommended maintenance schedule for their vehicles, which is typically outlined in the owner's manual. This schedule includes recommended maintenance tasks and intervals, including when to change the spark plugs. Following this schedule is essential to keep your car running smoothly and avoid potential problems.
For example, refrain from replacing your spark plugs at the recommended interval to avoid reduced fuel efficiency, engine misfires, and other issues. By checking your owner's manual and following the recommended maintenance schedule, you can help ensure your car's longevity and optimal performance.
Step-By-Step Guide To Changing Spark Plugs
- Access The Spark Plugs
The first step in changing spark plugs is to locate them. The spark plugs may be easily visible or hidden beneath a plastic cover, depending on the engine. You may need to remove the engine cover or air filter to gain access to the spark plugs. In addition, you may need a specialized tool, such as a spark plug socket, to reach the plugs. Once you have identified the location of the spark plugs, you can proceed to remove them.
- __Remove The Old Spark Plugs __
To remove the old spark plugs, use a socket wrench and a spark plug socket to loosen the plugs. Be sure to turn the socket counterclockwise to avoid damaging the plugs or the threads. Once the plugs are loose, gently pull them out of the engine. If the plugs are difficult to remove, use a twisting motion to avoid breaking them.
- Properly Gap The New Spark Plugs
Before installing the new spark plugs, gaping them properly is essential. The gap refers to the distance between the center and the ground electrode. Use a spark plug gap tool to measure the opening and adjust it as needed. Refer to the vehicle's owner manual or the spark plug manufacturer's instructions for the correct gap measurement.
- Install The New Spark Plugs
When installing the new spark plugs, it's essential to avoid cross-threading. Start by hand tightening the plugs, then use the socket wrench to narrow them until they are gently snug. Do not overtighten the plugs, as this can damage the engine. Once all plugs are in place, double-check to ensure they are securely tightened.
- __Properly Torque The Spark Plugs __
To ensure that the spark plugs are correctly tightened, use a torque wrench to apply the correct amount of torque. Again, refer to the vehicle's owner's manual or the spark plug manufacturer's instructions for the proper torque measurement. Properly torquing the spark plugs ensures a secure fit and prevents them from loosening.
- __Reconnect The Spark Plug Wires __
Once the new spark plugs are installed and torqued, reconnect the spark plug wires in the correct order. The wires should be firmly pressed onto the plugs until they click into place. Again, keep the order of the wires, as this can cause the engine to misfire. Finally, replace any removed engine covers or air filters and start the engine to ensure everything runs smoothly.
Test Your Car After Changing Spark Plugs
How to Test Your Car to Ensure the New Spark Plugs Are Functioning Properly
After replacing the spark plugs in your car, testing them to ensure they function correctly is crucial. Start by starting your engine and letting it idle for a few minutes. Then, listen to the engine to ensure it runs smoothly, without any misfires or strange noises. You can also use a diagnostic tool to check the performance of the spark plugs.
For example, check for any warning lights on your dashboard, as these may indicate a problem with the spark plugs. Additionally, you can perform a simple acceleration test by revving the engine and checking for any hesitation or stuttering. If everything appears normal, then your new spark plugs are functioning correctly.
Troubleshooting Tips for Issues That May Arise
Encounter any issues after replacing your spark plugs; there are a few things you can do to troubleshoot the problem. Start by checking the spark plug connections to ensure they are tight and secure. If the links are loose, this may cause misfires or other issues.
Also, check the spark plug wires for any damage or signs of wear, as this may cause issues. If you notice any problems, you may need to replace the wires. Finally, if your car is still experiencing issues, you can use a diagnostic tool to identify any error codes that may be present. This will help you pinpoint the problem and take the necessary steps to fix it.
Tips For Changing Spark Plugs
Importance Of Not Over-Tightening Or Under-Tightening The Spark Plugs Ensuring they are appropriately tightened and under-tightened when changing spark plugs is crucial. Over-tightening can cause the spark plug to become seized, making it difficult to remove later.
On the other hand, under-tightening can cause the spark plug to loosen over time, leading to misfires and potential engine damage. Therefore, it's essential to use a torque wrench to tighten the spark plug to the manufacturer's recommended specifications.
How To Avoid Cross-Threading The Spark Plugs
Cross-threading is a common problem when changing spark plugs, which occurs when the threads on the spark plug and the engine cylinder head don't align properly. To avoid cross-threading, it's essential to start threading the spark plug by hand and make sure it spins freely before using a wrench. Additionally, it's best to use anti-seize lubricant on the spark plug threads to prevent them from binding and cross-threading.
Common Mistakes To Avoid When Changing Spark Plugs
Some common mistakes to avoid when changing spark plugs include;
not disconnecting the battery before starting the job,
not replacing the spark plug wires or coils if needed, and
not checking the gap on the new spark plugs before installing them.
It's also essential to use the correct type of spark plug for your vehicle and to follow the manufacturer's recommended maintenance schedule. Lastly, clean the area around the spark plugs before removing them to prevent dirt and debris from falling into the engine.
