How to Test the Spark Plugs on Your Hyundai

 

Many Hyundai drivers may wonder how to test spark plugs if engine trouble occurs. Spark plugs are responsible for igniting the air-fuel mixture within your engine's cylinders, helping it start, so it's crucial to ensure they are working correctly. Testing them might seem intimidating at first, but we are here to guide you through the process. If you prefer, we also offer options for servicing at our location in New London, CT. Let's get started below!

What Are Spark Plugs?

Spark plugs are electrical devices located on the cylinder head, which sits at the top of the engine. They ignite the air-fuel mixture inside the engine's cylinders, allowing it to start each time you're ready to drive. About the size of your finger, they play a crucial role in everyday driving. Now, let's see how to test spark plugs.

Tools Needed for Testing Spark Plugs

To test your engine's spark plugs, Hyundai owners will need several essential tools. A multimeter is the easiest tester for spark plugs, but if you're replacing them, you will also need the following:

  • Your vehicle's owner's manual
  • A spark plug socket
  • A wobble socket
  • Spark plug boot puller pliers
  • A flexible handle ratchet
  • A torque wrench
  • A spark plug gap gauge

Once you have all these items, you can start testing and replacing your spark plugs. Your Hyundai manual is incredibly important for this process. If you can't locate it, we encourage you to contact your nearest Hyundai dealership for assistance.

A reading between 5K and 15K ohms on the multimeter indicates a functional spark plug.

Step-by-Step Guide to Test Spark Plugs

Preparation

The preparation for spark plug testing is minimal. You only need to gather the required tools and vehicle manual, then prop up your hood. Remember, the spark plugs are located on the engine's cylinder head.

Removing the Spark Plug Wires

To remove the spark plug wires, firmly grab the spark plug wire boot and twist it in either direction while pulling it off simultaneously.

Removing the Spark Plugs

After removing the spark plug wires, you'll need to remove the actual plugs. Since these are electrical components, handle them gently. Use your torque wrench with the spark plug socket to remove the spark plug from the engine.

Inspecting the Spark Plugs

Inspect the appearance and quality of the spark plugs. You should see brown or grayish-tan deposits on the side electrode, which are typical. However, black, oily deposits or black, dry soot on the electrodes and insulator tip are signs of trouble.

Testing Spark Plug Functionality

To test the spark plug's functionality, use the multimeter and follow these steps:

  • Set the Multimeter: Turn on the multimeter and set it to the 20K ohms setting (or the appropriate range for resistance measurement).
  • Remove the Spark Plug: Safely remove the spark plug from the engine for testing.
  • Test the Resistance:
    • Attach one probe of the multimeter to the tip of the spark plug (where the ignition wire connects).
    • Attach the other probe to the terminal at the bottom of the plug (the electrode).
  • Observe the reading on the multimeter: A good spark plug typically has a resistance between 5K and 15K ohms, though exact values may vary by vehicle.
  • Evaluate the Results:
    • If the resistance falls within the recommended range, the spark plug is likely functional.
    • If the reading is outside this range or shows no continuity, the spark plug may be faulty and should be replaced.

Reinstalling Spark Plugs

To reinstall your spark plugs, ensure your engine is cold and follow the steps in your Hyundai manual. Reattach the wires, and once everything is secure, try starting your car.

Interpreting Spark Plug Conditions

Before reinstalling your spark plugs, ensure they are clean and in good condition. Black soot or oily substances on the spark plug indicate that it should not be reinstalled.

Replacing Spark Plugs

Replacing spark plugs is simple, much like testing them, but it requires the proper tools and knowledge of Hyundai models. If you're uncomfortable handling this yourself, the team at Colonial Hyundai in New London, CT, is here to help. Reach out to our service center Monday through Friday for assistance.

Common Issues Related to Spark Plugs

There are several common signs of faulty or bad spark plugs, including lack of acceleration, trouble starting, overheating, misfiring, poor fuel economy, engine flooding, black exhaust smoke, engine surging, and a check engine light on the dashboard. If you notice any of these issues, it may be time to schedule a spark plug replacement with your local dealership. This service usually takes less than an hour and is one of the many services Colonial Hyundai offers.

Why Choose Our Hyundai Dealership for Maintenance

When it comes to maintaining your new or used Hyundai, there's no better place than Colonial Hyundai. Our state-of-the-art service center offers bumper-to-bumper repairs, replacements, and inspections for your engine's vital components. Our technicians are skilled in diagnosing problems quickly and starting repair work the same day. There's a reason New London rates us so highly - we love what we do, and we do it well!

Schedule Service at Colonial Hyundai

Now that you know how to test spark plugs in your Hyundai, consider scheduling a service with the professionals at Colonial Hyundai in New London, CT. We can handle inspections, replacements, and answer your engine-related questions. If you're not comfortable tackling your spark plugs yourself, let us take care of it!

Schedule Service