Essential Guide to Spark Plugs for the 2017-2024 Chevrolet Malibu
Keep your Malibu's 1.5L or 2.0L engine running smoothly by understanding when and why to replace your spark plugs.
- Symptoms of bad spark plugs include a rough idle, poor acceleration, reduced fuel economy, and a Check Engine Light.
- For the 2017-2024 Malibu, OEM-equivalent Iridium plugs from ACDelco or NGK are the best choice for performance and longevity.
- Replacement is recommended around 60,000 miles for the 2.0L engine and 90,000-97,500 miles for the 1.5L engine.
- This is a straightforward DIY job that can be completed in about an hour with basic tools, saving on labor costs.
Symptoms of Failing Spark Plugs in a Malibu
When your spark plugs start to wear out, your Malibu will give you several warning signs. You might notice the car just feels 'off' at first. Common symptoms include:
- Check Engine Light: A failing spark plug can cause an engine misfire, which will trigger the Check Engine Light. A flashing light indicates a severe misfire that requires immediate attention.
- Rough Idle: Your car may shake or vibrate noticeably when stopped, a classic sign of a misfiring cylinder.
- Poor Acceleration: The car may feel sluggish or hesitant when you press the gas pedal.
- Reduced Fuel Economy: When a plug fails to ignite fuel properly, that fuel is wasted, causing you to fill up more often.
- Difficulty Starting: A weak spark can make it harder for the engine to turn over and start.
Known Issues: 1.5L LFV Engine
Some 2016-2017 Malibu models with the 1.5L LFV engine were subject to a customer satisfaction program (N182195660) for a condition that could cause pre-ignition, leading to poor performance, misfires, and potential piston damage. While the primary fix was piston replacement, the procedure also involved inspecting the spark plugs. A separate recall (N192221960) for 2018 Malibu models with the 1.5L engine involved a software error that could disable fuel injectors, causing a stall. While not a direct spark plug issue, the resulting engine problems can present similar symptoms.
Choosing the Right Aftermarket Spark Plugs
For the 2017-2024 Malibu, the original equipment (OE) plugs are typically Iridium ACDelco plugs. When choosing a replacement, you have several good options that meet or exceed OE quality.
OEM vs. Aftermarket Quality:
The term "OEM" (Original Equipment Manufacturer) for your Malibu's spark plugs is ACDelco. However, it's widely known in the auto industry that major plug manufacturers like NGK often produce the plugs that are then branded as ACDelco. This means buying a high-quality aftermarket plug from a brand like NGK is often equivalent to buying the OEM part, sometimes at a better price. Both ACDelco and top-tier aftermarket brands like NGK and Bosch use long-lasting materials like Iridium and Platinum, which are designed for modern turbocharged engines.
Brand Quality Tiers for Your Malibu:
- Top Tier (OEM-Equivalent): ACDelco and NGK are the top choices. They are often the original equipment manufacturer and provide excellent performance and longevity. Many owners and mechanics consider them interchangeable in terms of quality for GM vehicles.
- Excellent Alternatives: Bosch and Denso offer high-quality Iridium and Platinum plugs that are excellent replacements. They are engineered for long life and performance, often exceeding 100,000 miles.
- Standard/Economy: Autolite and Champion provide reliable spark plugs that are often more budget-friendly. While they may not have the same longevity as Iridium plugs from top-tier brands, they are a dependable choice for regular maintenance.
Pro Tip: Check the Gap
While most modern Iridium and Platinum spark plugs come pre-gapped, it's a crucial step to verify the gap with a feeler gauge before installation. The correct gap ensures the most efficient spark. An incorrect gap can lead to misfires and poor performance. The required gap for the 1.5L engine is typically around 0.036 inches.
Replacement Schedule and Costs
Chevrolet recommends replacing the spark plugs in the Malibu at different intervals depending on the engine. For the 2.0L engine, the interval is typically 60,000 miles. For the standard 1.5L engine, the interval is longer, often around 90,000 to 97,500 miles. However, driving conditions can affect plug life, so it's wise to inspect them if you notice any symptoms.
| Item | Estimated Cost |
|---|---|
| New Aftermarket Spark Plugs (Set of 4) | $40 - $85 |
| New OEM Spark Plugs (Set of 4) | $60 - $100 |
| Shop Labor Cost | $109 - $160 |
| Total Professional Replacement 🎬 Save on labor costs by following this DIY replacement walkthrough. | $172 - $264 |
Frequently Asked Questions
Can I replace the spark plugs on my Malibu myself?
Yes, this is a very feasible DIY job for someone with basic tools. The spark plugs are located on top of the engine, accessible by removing the engine cover and ignition coils. You will need a socket wrench with an extension, a 10mm socket, and a special 9/16" or 5/8" spark plug socket. Always work on a cool engine to prevent burns and avoid damaging the aluminum cylinder head.
🎬 Watch this step-by-step guide to replacing your Malibu's spark plugs.Should I replace the ignition coils at the same time as the spark plugs?
It is not required, but it is a good time for inspection. While you have the ignition coils removed to access the plugs, check them for any signs of cracking, swelling, or corrosion. If your car has high mileage or you've been experiencing severe misfires, replacing the coils along with the plugs can be a good preventative measure.
🎬 See how to properly inspect your ignition coils during replacement.What's the difference between Iridium and Platinum spark plugs?
Iridium and Platinum are precious metals used on the tip of the spark plug's electrode. Iridium is harder and has a higher melting point than platinum, which generally allows for a longer service life and a more consistent, stable spark. For the turbocharged engines in the Malibu, Iridium plugs (like the OEM ACDelco parts) are the recommended choice for longevity and performance.
What happens if I don't change my spark plugs?
Ignoring worn-out spark plugs will lead to worsening engine performance. You'll experience a rougher idle, poor acceleration, and lower gas mileage. More seriously, a consistent engine misfire can allow unburned fuel into the exhaust system, which can overheat and damage the expensive catalytic converter.
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Technical Specifications
OEM Part Numbers: 12681659 41-125 12683541 41-156 5549097R6
For the 1.5L LFV engine, the spark plug socket size is typically 9/16 inch. For the 2.0L LTG engine, it is often a 5/8 inch socket. The recommended spark plug type is Iridium for its longevity and performance in turbocharged engines.
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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.
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