A Guide to Spark Plug Replacement for the 2020-2024 Kia Forte
Eliminate rough idling and restore your Forte's performance by choosing the right new spark plugs for your engine.
- You must verify your engine type (2.0L MPI or 1.6L Turbo GDI) before buying parts, as they are not interchangeable.
- NGK is the OEM-equivalent brand and is highly recommended by owners for reliability and performance.
- This is a very easy DIY replacement that requires basic tools and can be completed in under an hour.
- Ignoring symptoms like misfiring can lead to more serious engine problems and damage to the catalytic converter.
Is Your Forte's Engine Running Rough? It Could Be the Spark Plugs
If your 2020-2024 Kia Forte is experiencing symptoms like a shaky idle, poor acceleration, or worse fuel mileage than usual, worn-out spark plugs are a likely culprit. These parts are critical for igniting the fuel in your engine, and when they start to fail, the engine's performance suffers. Other signs include difficulty starting the engine and the check engine light coming on, often with codes indicating an engine misfire (P0300-P0304).
🎬 Watch: Common symptoms and signs of failing spark plugsA Critical First Step: Identify Your Engine
The 2020-2024 Kia Forte comes with two different engines, and they use different spark plugs. Ordering the wrong part is a common and costly mistake. Before you buy, confirm if you have the standard 2.0L MPI engine or the more powerful 1.6L Turbo GDI engine found in the GT models. 🎬 Watch: How to replace spark plugs on the Forte GT Your owner's manual or the emissions label under the hood will have this information.
Choosing the Right Aftermarket Spark Plugs
When it comes to aftermarket spark plugs, quality can vary. For the Kia Forte, sticking with brands known for reliability is your best bet. Here’s how the available brands generally stack up based on mechanic and owner feedback.
Tier 1: OEM Quality & Top Performance
- NGK: This brand is widely considered the original equipment (OEM) supplier for Kia. Owners and mechanics consistently recommend NGK Iridium plugs for their long life and reliable performance, making them the safest and best choice for both the 2.0L and 1.6L Turbo engines.
Tier 2: Reliable Aftermarket Alternatives
- Bosch: Bosch is a well-respected German brand that produces quality Iridium and Platinum plugs. While some enthusiasts prefer NGK, Bosch is a solid choice that will perform well in your Forte.
Tier 3: Budget-Friendly Options
- Champion & Autolite: These brands offer more affordable spark plugs, often made with copper or platinum. While they will work, they may not offer the same longevity or performance as iridium plugs from NGK or Bosch. They can be a good choice if you are on a tight budget, but expect to replace them more frequently.
Pro Tip: Iridium is Worth the Investment
Modern engines like those in the Forte are designed for long-lasting iridium spark plugs. While they cost more upfront, they can last up to 100,000 miles, compared to 30,000 miles for standard copper plugs. This means fewer replacements and more consistent engine performance over time.
Known Issues and Service Bulletins
While there are no active recalls for spark plugs on the 2020-2024 Forte, Kia has issued Technical Service Bulletins (TSBs) for slightly older models with similar engines. TSB SA342 for the 2018 Forte noted that cracked spark plug porcelain could cause engine misfires. Another TSB, SA321, addressed ignition coil issues on 2017-2018 models that also led to misfires. These past issues highlight the importance of using quality parts to avoid similar problems.
Cost of Replacing Spark Plugs on a 2020-2024 Kia Forte
The cost will depend on the parts you choose and whether you do the job yourself. The replacement is a simple, DIY-friendly task that can be done in under an hour with basic tools.
| Item | Estimated Cost |
|---|---|
| New Aftermarket Spark Plugs (Set of 4) | $17 - $92 |
| New OEM Spark Plugs (Set of 4) | $72 - $180 |
| Shop Labor | $100 - $180 |
| Total DIY Cost (Aftermarket) | $17 - $92 |
| Total Professional Replacement (Aftermarket) | $117 - $272 |
Frequently Asked Questions
How often should I change the spark plugs on my Kia Forte?
The recommended replacement interval is typically every 60,000 miles, but you should always check your owner's manual for the specific schedule for your vehicle. If you use high-quality iridium plugs, they can often last up to 100,000 miles.
Is it hard to replace the spark plugs myself?
No, this is considered a very easy DIY job. The spark plugs are easily accessible on top of the engine. You will need a 10mm socket to remove the ignition coils and a 5/8-inch spark plug socket with an extension to remove the plugs themselves.
What's the difference between spark plugs for the 2.0L and 1.6L Turbo engines?
The 1.6L Turbo GDI engine runs at higher pressures and temperatures, so it requires a different type of spark plug (often a 'colder' heat range) than the standard 2.0L engine. Using the wrong plug can cause poor performance and even engine damage. Always verify the correct part number for your specific engine.
Should I put anti-seize on the new spark plugs?
Most modern spark plug manufacturers, like NGK, apply a special anti-corrosion plating to their plugs and recommend NOT using anti-seize. This is because anti-seize can act as a lubricant, causing you to over-tighten the plugs and potentially damage the cylinder head. Install them dry, and tighten to the torque specification in the service manual.
What is a spark plug gap and do I need to set it?
The gap is the small space between the center and ground electrodes. Most high-quality aftermarket plugs (like NGK and Bosch) come pre-gapped for your vehicle. It's always a good idea to double-check the gap with a feeler gauge before installation, but you should not have to adjust it.
Helpful Videos
Technical Specifications
OEM Part Numbers: 1886709095 (For 2.0L Nu Engine) 18849-08080 (For 1.6L Turbo Engine)
Material: Iridium is recommended for longevity and performance. Socket Size: 5/8 inch. Ignition Coils are held by a 10mm bolt.
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The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Kia Forte:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Is Your Forte's Engine Running Rough? It Could Be the Spark Plugs
- A Critical First Step: Identify Your Engine
- Choosing the Right Aftermarket Spark Plugs
- Tier 1: OEM Quality & Top Performance
- Tier 2: Reliable Aftermarket Alternatives
- Tier 3: Budget-Friendly Options
- Pro Tip: Iridium is Worth the Investment
- Known Issues and Service Bulletins
- Cost of Replacing Spark Plugs on a 2020-2024 Kia Forte
- Frequently Asked Questions
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