Set the parking brakes, park your Hyundai in a secure location, and let the engine cool.
Closed Hood Open the hood next. Clean the region around the ignition coils and the vicinity of the spark plugs.
- Negative battery terminal disconnected. It is safe to unplug the negative battery terminal as you will be dealing with the electrical system.
- Engine cover removal. Up to four 10mm bolts, which are accessible from the top of the engine, are used to secure it in place. Open up the engine cover if there are no bolts on the top.
Eliminate the ignition coils. The ignition coils should then be disconnected after removing the engine cover. By depressing the locking tab and drawing the connector away, you can unplug the ignition coil connector.
- To remove the bolt holding the coil in place, use a 10 mm socket. This car has a coil-on-plug layout. Therefore, each spark plug will have one coil. Pull the ignition coils out after removing the bolt and connector. If the ignition coil still won’t rise, try raising it up and out after a slight twist.
Delete the spark plug. Before removing the spark plugs, blow debris out of the recess.
- To remove the spark plugs from the engine, use the spark plug removal tool, ratchet, and 3/8″ extension. To take out the spark plug, turn counterclockwise. A magnetic pickup tool may be required to remove the spark plug.
Replace the spark plugs. Installing the new spark plug is now necessary. Using a spark plug gapping tool to check the gap is a recommended practice. While some spark plugs, like copper plugs, might be pre-gapped, others might not.
- The electrical connector should be attached to each ignition coil after installation. Put the engine cover back on.
- Remove all of the engine’s tools.
- Start the car’s engine and give it a test drive.
Use an OBD-II scanner to erase any codes if a faulty spark plug or ignition coil caused the check engine light to come on.
In This Article...
How frequently should a Hyundai Sonata have its spark plugs changed?
30,000 miles every Similar to the Elantra, the Sonata should have its coolant replaced no later than 120,000 miles and its spark plugs replaced around 95,000 miles.
How many spark plugs are required for a Hyundai Sonata?
The timetable for vehicle maintenance should be followed when replacing. This will be mentioned in the owner’s manual for the car. At 30, 60, or 100k miles, some vehicles need to be regularly replaced. Spark plug failure before the service schedule is occasionally possible, however it is not frequently the case.
Putting off replacing your spark plugs can lead to:
- having trouble starting your car.
- Check for a misfire code on the check engine light.
- When the check engine light flashes during acceleration because of a misfire, the engine may be harmed.
- reduced power and/or fuel efficiency.
- rough idle, and/or inexplicable vibration of the engine.
- State emission tests failed.
Spark plugs should always be replaced in sets, even if just one is determined to be broken. In most engines, 4, 6, or 8 spark plugs are used.
How long do Hyundai Sonata spark plugs last?
30,000 miles every Spark plug replacement for the Sonata should occur at 95,000 miles, and coolant replacement should occur no later than 120,000 miles.
Can I replace my own spark plugs?
For a four-cylinder engine, changing spark plugs takes approximately an hour, and you can do it yourself and save at least $100 in labor costs. Most of the time, it’s a straightforward task that will help to maintain optimum performance and the best gas mileage.
Do 2015 Hyundai Sonatas have issues with their engines?
The powertrain of the 2015 Sonata is by far the most serious issue. The throttle control system is causing havoc despite the fact that the engines and transmissions are fine on their own. More than 300 reports describe problems with stalling, unwanted acceleration, engine hesitancy, and wildly variable rpms.
Numerous accounts also discuss check engine lights and high oil use. One owner said that after having their ECU reset to address the issue, the problem soon reappeared. Unfortunately, the throttle system still has no factory remedy.
Are the engines in 2015 Hyundai Sonatas subject to a recall?
- Due to defective connecting-rod bearings that may wear out too quickly and harm the engine, Hyundai has recalled 128,948 vehicles.
- The 2012 Santa Fe, the 2015–2016 Veloster, the 2011–2013, and the 2016 Sonata Hybrid are all included in the recall.
- Beginning on January 22, 2021, owners of the impacted vehicles will get notifications, and those whose engines exhibit bearing deterioration will have their engines replaced.
According to the National Highway Traffic Safety Administration, connecting-rod bearings in Hyundai Motor America’s 128,948 vehicles, including the 2012 Santa Fe, the 2011 to 2013 and 2016 Sonata Hybrid, and the 2015 to 2016 Veloster, could prematurely wear out and harm the engine. The engine damage may ultimately raise the risk of a fire or an engine stall, both of which may cause an accident.
Beginning on January 22, 2021, owners will receive notices about the recall and instructions to take their cars to a Hyundai dealer. The engine will be replaced if the dealer discovers bearing damage. Through a software update, dealers will also install a new Knock Sensor Detection System (KSDS); the system will monitor engine vibrations to find signs of damage or early wear.
Owners of these cars should watch out for any of the following before receiving notification of the recall because they may be signs that the engine’s connecting-rod bearings are wearing down: odd engine knocking sounds, diminished power or hesitation, the “check engine” or “engine oil pressure” warning lights coming on, or a burning smell, oil leaks, or smoke.
Hyundai owners can see if their car is subject to the recall by visiting the NHTSA website or downloading the new recall app.
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Do I have to unplug the battery to replace the spark plugs?
When trying to replace the spark plugs in their car, this is a common query that individuals have. The battery does not need to be disconnected in order to replace the spark plugs, is the response. You may just detach the spark plug from the engine and then remove the spark plug wire from it.
Additionally, when working on anything electrical, it’s crucial to disconnect the negative connection of your automobile battery. Any mishaps will be less likely as a result. Before changing your spark plugs, make sure the engine of your automobile has completely cooled. By doing this, it will be simpler to remove the plugs and the ignition coil boot or spark plug wire.
What is the most effective tool for removing spark plugs?
Just a few tools are required to replace the spark plugs in your car. The most crucial equipment is a spark plug socket and an extension for a socket wrench. There are two sizes available for spark plug sockets: 5/8 inches and 13/16 inches. The rubber insert included in most spark plug sockets keeps the plug firmly in place.
If it’s tough to get to your spark plugs, you could also require a universal joint. The wrench can be turned in one axis and converted into a rotation around another axis using universal joints, which are articulated joints. A universal joint might be useful if you can’t fit a wrench and extension in the area surrounding your spark plugs.
It’s crucial to avoid overtightening the spark plugs when changing them. The threads in the cylinder head or the spark plug may be harmed if it is overtightened. Make sure you don’t overtighten your plugs by using a torque wrench. The torque you apply when twisting a torque wrench is indicated via a gauge on the tool.
While the majority of contemporary spark plugs are pre-gapped from the factory, having a gapping tool on hand is a smart idea. Using a gapping tool, you can check if the gap between the ground electrode above the spark plug’s center electrode is the appropriate size. The spark on your spark plug ignites here.
A pair of boot pliers, a length of rubber tube, a clean rag, some rubbing alcohol, a tube of anti-seize, compressed air, or a wet/dry vacuum may also be useful to have on hand. Although not necessary for a straightforward spark plug replacement task, these supplies can make sure that everything goes according to plan.
Should I switch to spark plugs instead of ignition coils?
Spark plugs and ignition coils work in tandem. The other cannot work correctly if either one fails. So, should spark plugs be used in place of coil packs? It varies.
The spark plugs are the part that needs to be changed the most frequently along with the ignition coils. Coils can be overworked by worn spark plugs, and the effort needed to replace both parts is frequently overlapped. It is advisable to repair both parts at once if your worn-out spark plugs caused your ignition coils to fail.
However, unless there are indications that they are malfunctioning, replacing your ignition coils at the same time that you replace your spark plugs as part of routine maintenance is not necessary.
It is advised to replace the wires in ignition/spark plug systems if they look to be brittle, worn, or broken. If moisture (such as an oil leak) has harmed the ignition coils, the moisture source should also be fixed in order to prevent the problem from reappearing too soon.
The moment you notice a problem with your ignition coil, call a professional. Should I replace my ignition coils with spark plugs? is one of the first queries you should put to your expert. Have your mechanic check your car to see whether the ignition coils and spark plugs need to be replaced.
How can a faulty spark plug be identified?
1) Your car starts slowly. It makes sense that we typically blame the battery for a car’s inability to start. However, worn-out spark plugs can also be the issue. Your automobile won’t move if there is no ignition, which means there will be no spark. 2) Your automobile idles poorly. Even if your automobile does start, faulty spark plugs will continue to cause issues for a long time. In a perfect world, your automobile shouldn’t rattle while idling and its engine should sound smooth. However, faulty spark plugs will result in a jerky and harsh idle. 3) Your engine may occasionally misfire. Have you ever noticed that your automobile briefly stops or hesitates when you’re driving? This might be the case as a result of improper cylinder firing, which frequently results from a bad spark plug. 4) The engine revs up. Similarly, you can occasionally experience your automobile jerking before slowing down or seeming to start and stop. This is another sign of a faulty plug since it sometimes indicates that more air is being taken in during the combustion process. 5) You are using more fuel than normal. Because it occasionally performs an incomplete combustion, a faulty spark plug uses fuel inefficiently, effectively wasting the fuel it is intended to burn. This may result in a 30% reduction in fuel efficiency. 6) Your vehicle isn’t accelerating properly. A defective spark plug may also be to blame if you press the gas and don’t get the reaction you’re used to. All of this proves, as you can see, that a functioning, clean-burning spark plug is vitally necessary to your car’s continued performance.
What happens during a tune-up on a 2015 Hyundai Sonata?
There are a number of Hyundai Sonata engine tune-up options available at your neighborhood Firestone Complete Auto Care.
Along with a visual check of your engine’s parts and the installation of new spark plugs, this service also comes with a lifetime parts warranty*.
Your Sonata’s filters are given extra attention via a different servicing option. We specifically change the air and fuel filters.
Another service is fuel system cleaning, which entails clearing out varnish, debris, and carbon buildup from your Sonata’s fuel injectors, throttle body, and throttle plate.
Here’s something to keep in mind when selecting services: the type of service your Sonata requires might be determined by the vehicle’s mileage and service history.
To find out more about the particular requirements for your car, discuss your driving habits, mileage, and service history with a technician.