![]() After that, we will learn how to check spark plugs. Then we will discuss the bad spark plug symptoms and learn more about what will happen when they fail. And in this article, we are going to help you to learn precisely that.įirst, we are going to learn what are spark plugs and why they are so important. All you need to do is to learn to read them. And frankly, a spark plug can tell a lot of stories. This is why learning how to check spark plugs is really important for you to know if you want to make sure that your spark plugs perform as they should all of the time. But still, there could be spark plug damage and after a ton of miles, the spark plugs will start deteriorating and will make you unable to start your car in the worst case. Having a problem like this with the spark plugs is not that present now the way it was present in the past since modern engines keep spark plugs in fairly good condition. If you are not comfortable with testing your spark plug wires on your own, a certified mechanic from YourMechanic will be glad to come out and test your spark plug wires and your ignition system for you.Have you started noticing some weird starting issues with your car and you want to learn how to check spark plugs? If that is the case, then you are at the right place because there will be a lot to cover on this topic. Spark plug wires can also be upgraded to high performance replacements if modifications are made to the ignition system. ![]() Therefore, it is important to change the spark plug wires are every tune-up interval. Spark plug wires that are failing can cause a series of running issues such as engine misfires, low power, stalling, and Check Engine Light illumination. Verify that there are no running issues with your vehicle. Again, you should feel it snap into place. Step 11: Push the spark plug wire onto the coil or distributor cap. Step 10: Push the spark plug wire onto the spark plug until you feel it snap into place. Step 9: Place the spark plug wire firmly into the same wire clips and lock them in place. Make sure that the spark plug wire does not get too close to other electronics, or on anything hot such as the exhaust. Step 8: Install the spark plug wire using the same routing that it was originally in. Place a small amount of spark plug wire grease into each end of the spark plug wire boot.Īpplying spark plug wire grease will make it easier to remove the spark plug wires next time. In some cases, spark plug wires should also be checked when the engine is hot, as the resistance can change due to heat. If your spark plug wires do not meet the manufacturer’s specifications for internal resistance readings, or if they show signs of cracking or melting, then they need to be replaced. Tip: When testing the wire, you must make sure that the tester leads are touching the metal contacts inside both ends of the spark plug wire.Step 6: Check the resistance of the wire. Look for any signs of melting or cracking. Step 5: Visually check the spark plug wire for damage. Step 4: Unclip the spark plug wire from the retaining clips. You will detach the wire either at the coil pack or at the distributor cap by twisting it slightly and pulling on it. If this occurs, the wire must be replaced. In some cases, the spark plug wire’s internal connector will break and remain on the spark plug, as shown above. Tip: Use a slight twisting motion to loosen the spark plug wire from the spark plug.Use the pliers as close to the end of the spark plug boot as possible. Step 2: Remove the spark plug wire at the spark plug. Step 1: Park your vehicle and allow the engine to cool. Part 1 of 1: Visual inspection and testing of the wire ![]() If your car is equipped with spark plug wires, they typically need to be replaced at tune-up intervals, but knowing how to test them can help you to diagnose small problems before they become large ones. If either of these instances occur, there will not be enough voltage to produce a spark at the spark plug. Over time the spark plug wire may melt and short out to a metal part of the engine or it may be worn, causing high internal resistance. That voltage needs to be high enough to produce a spark that is strong enough to jump the gap of the spark plug. The spark plug wire needs to carry thousands of volts of electricity to the spark plug. Spark plug wires are typically constructed with a silicone jacket that keeps them insulated and resistant to high temperatures, and have internal shielding which keeps them from producing any electrical interference. The wire can be several inches or several feet in length. On engines that are equipped with a distributor or a remote coil pack, spark plug wires are used to transfer the spark from the coil to the spark plug. With the introduction of coil-on-plug ignition, there is no long wire that is needed to connect a coil to the spark plug. Spark plug wires have become nearly non-existent on many modern vehicles.
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