A Guide to Spark Plugs for the 2019-2024 Chevrolet Blazer
Learn to spot failing spark plugs and choose the right replacement for your Blazer's specific engine.
- The replacement procedure for the 3.6L V6 is much more difficult than for the 4-cylinder engines because the intake manifold must be removed.
- Replacement intervals are engine-specific: 60,000 miles for the 2.0L Turbo and 97,500 miles for the 3.6L V6.
- ACDelco (OEM) and NGK are top-tier choices, with NGK often being the manufacturer for ACDelco plugs.
- A P0300 engine code is a strong indicator that your spark plugs may be failing.
Is It Time for New Spark Plugs?
Worn-out spark plugs can cause noticeable problems with your Blazer's performance. Because they are so vital for clean combustion, a failing plug will often make the engine run poorly. If you ignore the symptoms for too long, you risk damaging more expensive components like your catalytic converter due to unburnt fuel passing through the exhaust.
Symptoms of Failing Spark Plugs:
- Check Engine Light: A flashing or solid check engine light is the most common sign. It's often paired with a code like P0300 for a random misfire. 🎬 Watch: Understanding and fixing the P0300 misfire code.
- Rough Idle: The engine may shake or vibrate more than usual when you're stopped.
- Poor Acceleration: You might feel a hesitation or lack of power when you press the gas pedal.
- Reduced Fuel Economy: If you're filling up your tank more often, failing plugs could be the cause. Worn plugs can decrease fuel economy by up to 30%.
- Trouble Starting: A weak spark makes it harder for the engine to start, especially in cold weather.
Known Issues and Technical Service Bulletins (TSBs)
While there are no specific recalls for spark plugs on the 2019-2024 Blazer, GM has issued service bulletins related to misfire conditions. TSB #18NA115 addresses cold start misfires with a P0300 code. TSB #PIP5095G notes that technicians may find oil or coolant in a spark plug tube, which can cause a misfire and requires fixing the underlying leak (like a valve cover gasket) before replacing the plug.
Choosing the Right Aftermarket Spark Plugs
Your Blazer came from the factory with ACDelco Iridium spark plugs. When shopping for replacements, you have several good options that meet or exceed original quality.
Tier 1: OEM & OEM-Equivalent
These brands provide the same quality and lifespan as the parts your vehicle was built with. Many owners prefer to stick with these for guaranteed compatibility and performance.
- ACDelco: As the original GM parts brand, their Iridium plugs are the factory-correct choice and a reliable benchmark for quality.
- NGK: NGK is a known supplier for ACDelco, and you might even find "NGK" stamped on an ACDelco plug. Their Laser Iridium and Iridium IX lines are considered direct OEM-quality replacements.
Tier 2: Premium Aftermarket
These brands are well-respected and produce high-quality iridium and platinum plugs that offer excellent performance and longevity, often at a competitive price.
- Denso: A major OEM supplier for many Japanese automakers, Denso makes excellent Iridium spark plugs that are a strong alternative to ACDelco or NGK.
- Bosch: Known for their engineering, Bosch Double Iridium and Double Platinum plugs are a popular and durable choice designed for long life.
Tier 3: Standard Replacement
If you're on a tighter budget, these brands offer dependable plugs that get the job done. They may use copper or platinum materials and might not last as long as iridium plugs, but they are a reliable choice for regular maintenance.
- Autolite: Their XP Iridium and Platinum plugs are a common and trusted replacement option.
- Champion: Champion offers a range of plugs from basic copper to iridium, providing a cost-effective solution.
A Note on Spark Plug Gap
Modern iridium and platinum spark plugs, like the ACDelco GM OE plugs, come pre-gapped from the factory for your specific engine. You should never try to adjust the gap on a fine-wire iridium plug, as you can easily damage the delicate electrode. It's still a good practice to gently check the gap with a wire-style gauge to ensure it wasn't damaged in shipping, but do not force it.
Replacement Cost for Chevrolet Blazer Spark Plugs
| Category | Estimated Cost |
|---|---|
| New Aftermarket Spark Plugs (per plug) | $4.09 - $22.14 |
| New OEM (ACDelco Iridium, per plug) | $11.00 - $25.00 |
| Shop Labor | $150 - $500 |
Frequently Asked Questions
How often should I replace the spark plugs on my Chevrolet Blazer?
The replacement interval depends on your engine. For Blazers with the 2.0L Turbo engine, 🎬 See this step-by-step spark plug replacement for 2.0L engines. Chevrolet recommends replacement every 60,000 miles. For the 3.6L V6 engine, the interval is 97,500 miles. For the 2.5L engine, a general guideline of 60,000-100,000 miles for iridium plugs is appropriate.
Is replacing the spark plugs a DIY job?
It depends on your engine. For the 2.5L and 2.0L 4-cylinder engines, the spark plugs are easily accessible, making it a straightforward DIY job for someone with basic tools. However, on the 3.6L V6 engine, the three rear spark plugs are located under the upper intake manifold, which must be removed for access. This is a more complex and time-consuming job that may be best for an experienced DIYer or a professional mechanic.
Should I replace the ignition coils at the same time as the spark plugs?
It is not required. Ignition coils typically last much longer than spark plugs and are replaced only when they fail. However, if you have a high-mileage vehicle or are already paying for the labor to access the rear plugs on a V6, you might consider replacing the coils as a preventative measure to save on future labor costs.
What is the difference between Iridium and Platinum spark plugs?
Iridium is a harder, more durable material than platinum with a higher melting point. This allows for a very fine center electrode, which creates a more focused and consistent spark. Iridium plugs generally offer the best performance and longest life, which is why they are used as original equipment in modern engines like the Blazer's.
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Technical Specifications
OEM Part Numbers: 12681664 41-130 12683541
Material: Iridium. Gap: Pre-set from the factory, do not adjust. Socket Size: Varies by engine, 14mm noted for some V6 models.
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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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