If you are looking for the best spark plugs for Chevy Equinox, the most important thing is getting the correct plug for your specific engine. The Chevrolet Equinox has used several engines over the years, so the spark plug that works for a newer 1.5L turbocharged Equinox may not be the right choice for an older 2.4L model.
For compatible newer Equinox applications, my primary recommendation is the ACDelco GM Original Equipment 41-156 Iridium Spark Plug. It is a GM OE-related iridium spark plug designed for specific Chevrolet applications and is listed for Equinox models using the 1.5L engine.
For older 2.4L Equinox models, I would look at the NGK 4344 Iridium IX Spark Plug or the DENSO 5338 Iridium Power Spark Plug. Both are established iridium options for compatible 2.4L applications.
The key is not simply choosing an iridium spark plug. You need to verify your Equinox’s model year, engine, spark plug number, gap, thread size, reach, and seat design before ordering.
Best Spark Plugs for Chevy Equinox
| Image | Product Name | Check Price |
|---|---|---|
Best Choice | ACDelco GM Original Equipment 41-156 Iridium Spark Plug | Check Price |
Second Best | NGK 4344 Iridium IX Spark Plug | Check Price |
Third Choice | DENSO 5338 Iridium Power Spark Plug | Check Price |
I selected these three spark plugs because they cover important Equinox applications and give buyers options from GM/ACDelco, NGK, and DENSO. They are not universal replacements for every Equinox, so always verify the exact fitment for your vehicle.
1. ACDelco GM Original Equipment 41-156 Iridium Spark Plug
Key Features
- GM Original Equipment spark plug
- ACDelco part number 41-156
- GM part number 12683541
- Iridium center electrode
- 0.030-inch factory gap
- 14 mm hex size
- 0.98-inch reach
- Tapered seat
- Heat range 8
- Designed for specific 1.5L Equinox applications
Detailed Review
The ACDelco GM Original Equipment 41-156 is my first choice for a compatible newer Chevrolet Equinox because it follows the original-equipment specification rather than trying to turn a spark plug replacement into a performance modification.
This plug uses an iridium center electrode, which is well suited to modern gasoline engines. Iridium has excellent high-temperature resistance and good wear resistance, allowing the center electrode to remain relatively fine while maintaining durability.
The 41-156 is particularly relevant to the 2018-and-newer Equinox 1.5L application. GM lists part 12683541, which corresponds to ACDelco 41-156, for multiple Equinox model years. That makes this plug a straightforward option when the vehicle’s exact parts information calls for this number.
The plug has a 0.030-inch gap, a 14 mm hex, approximately 0.98-inch reach, and a tapered seat. These specifications are important because spark plugs are not interchangeable simply because they have the same brand or electrode material.
One feature I particularly like is that ACDelco supplies this type of GM OE iridium plug pre-gapped. That makes installation simpler, but it also means you should not casually bend the electrode to change the gap. If the plug is incorrectly gapped, it is better to replace it with the correctly specified plug than risk damaging the fine electrode.
The iridium construction also makes this plug a good match for an owner who wants a dependable replacement rather than an experimental performance part. It is designed to work with the ignition system and combustion requirements of the specified GM engine.
Installation should still be done carefully. The engine should be cool, the area around the spark plug should be clean, and the plug should be started by hand before tightening. Use the torque specification for the exact Equinox engine rather than applying a generic spark-plug torque value.
The biggest limitation is compatibility. This is not the right spark plug for every Equinox. Older 2.4L and V6 applications use different spark-plug specifications.
What I Like
- Strong OE-oriented choice for compatible Equinox models
- Iridium center electrode
- Factory-specified 0.030-inch gap
- Tapered seat and application-specific dimensions
- Good choice for daily driving
- Directly associated with GM’s original-equipment parts program
What I Do Not Like
- Not compatible with every Equinox engine
- Buyers must verify the exact application
- Not intended as a universal performance upgrade
- Older Equinox owners may need a completely different plug
Product-Specific Verdict
I would choose the ACDelco 41-156 first for a compatible Equinox 1.5L application. Its OE-oriented specifications and iridium construction make it a practical replacement for owners who want to stay close to the original engine configuration. If your Equinox does not call for 41-156, however, choose the correct application-specific plug instead.
Best Spark Plugs for Older Chevy Equinox Models
Older Equinox models require a different approach. The 2010–2017 Equinox 2.4L four-cylinder, for example, has its own spark-plug specifications. For those applications, NGK and DENSO offer strong iridium alternatives.
2. NGK 4344 Iridium IX Spark Plug
Key Features
- NGK Iridium IX design
- NGK part number 4344
- LTR5IX-11
- Iridium fine-wire center electrode
- 14 mm thread
- 25 mm reach
- Application-specific design
- Listed for compatible 2010–2017 Equinox 2.4L applications
Detailed Review
The NGK 4344 Iridium IX is a strong aftermarket option for owners of compatible Chevrolet Equinox 2.4L models.
NGK has a long history of producing spark plugs for original-equipment and replacement applications, and the Iridium IX line is designed around a fine-wire iridium center electrode. The goal is to provide reliable ignition while maintaining good electrode durability.
For the Equinox, the important point is that NGK 4344 is an application-specific plug. It should not be treated as a universal replacement for every Chevrolet engine.
The 4344 uses an iridium center electrode and a tapered-cut ground electrode. The design is intended to provide consistent ignition characteristics while reducing the amount of electrode material exposed to the combustion environment.
For compatible 2010–2017 2.4L Equinox applications, the plug provides an aftermarket alternative to an OE-style replacement. This can be useful if you prefer NGK products or want to compare an aftermarket iridium plug with an ACDelco replacement.
The plug uses a 14 mm thread and approximately 25 mm of reach. Its application-specific gap should be confirmed before installation. Do not assume the gap is the same as a different NGK model or a different Equinox engine.
Installation is straightforward in principle but still requires care. Clean around the ignition coil and spark-plug well before removing the old plug. Dirt falling into the cylinder-head opening can create unnecessary problems.
When installing the new plug, start it by hand. If the plug does not thread smoothly, stop rather than forcing it. Cross-threading a spark-plug hole can turn a simple maintenance job into a much more expensive repair.
I also recommend inspecting the old spark plugs before throwing them away. If the plugs show heavy oil contamination, severe carbon deposits, or unusual electrode wear, the condition may point to an engine problem rather than normal spark-plug aging.
What I Like
- Well-established NGK spark-plug design
- Iridium fine-wire center electrode
- Strong choice for compatible 2.4L Equinox applications
- Good alternative to an OE-branded plug
- Durable construction
- Straightforward replacement design
What I Do Not Like
- Not suitable for every Equinox engine
- Exact application should be verified before ordering
- Gap should not be assumed from another NGK application
- Older and newer Equinox engines require different plugs
Product-Specific Verdict
The NGK 4344 is a good choice for a compatible 2010–2017 Equinox 2.4L. I would choose it when I want an established aftermarket iridium plug and have verified the exact application. It is a particularly useful alternative for owners who prefer NGK over an OE-branded spark plug.
3. DENSO 5338 Iridium Power Spark Plug
Key Features
- DENSO Iridium Power design
- DENSO part number 5338
- Model ITV16
- 0.4 mm iridium center electrode
- Iridium electrode material
- U-groove ground electrode design
- 14 mm thread
- Application-specific construction
- Listed for compatible 2010–2017 Equinox 2.4L applications
Detailed Review
The DENSO 5338 Iridium Power is another strong option for the 2.4L Chevrolet Equinox applications that specify this plug.
DENSO’s Iridium Power design uses a fine 0.4 mm iridium center electrode. A smaller electrode can help concentrate the spark at the firing point, while the iridium material provides good resistance to heat and electrode wear.
The DENSO 5338 is also listed as ITV16. For compatible Equinox applications, it is designed around the dimensions and operating requirements of the 2.4L engine.
One of the more interesting features is DENSO’s U-groove ground-electrode design. The shape is intended to improve the ignition characteristics of the plug while maintaining a durable ground electrode.
The plug is listed with a 0.044-inch gap for the relevant 2.4L Equinox application. However, I would still verify the gap against the exact vehicle and plug information before installation. Spark-plug specifications can change between engines and model years.
The DENSO 5338 is a good alternative if you want something different from the ACDelco and NGK options. It is not necessarily going to make a healthy Equinox dramatically faster, but a correctly specified replacement plug can help maintain normal ignition performance when the original plugs are worn.
As with any spark plug, installation quality matters. The plug should be kept clean, installed carefully, and tightened according to the vehicle-specific specification.
I would also avoid using aggressive claims about fuel economy or horsepower. Spark plugs are primarily maintenance components. Replacing worn plugs can restore normal operation, but a new plug should not be presented as a guaranteed performance modification.
What I Like
- DENSO Iridium Power technology
- Fine 0.4 mm iridium center electrode
- U-groove ground-electrode design
- Good option for compatible 2.4L Equinox models
- Established spark-plug manufacturer
- Useful alternative to NGK and ACDelco
What I Do Not Like
- Limited to specific applications
- Not appropriate for every Equinox engine
- Gap must be verified
- Buyers need to distinguish the 5338 from other DENSO spark-plug numbers
Product-Specific Verdict
I would consider the DENSO 5338 for a compatible 2010–2017 Equinox 2.4L when I want an iridium aftermarket alternative. Its fine-wire electrode and application-specific construction make it a solid option, but fitment should always be confirmed before ordering.
Chevy Equinox Spark Plug Comparison
| Product | Product Type | Electrode Material | Gap | Reach | Seat Type | Compatible Application | Main Strength | Main Limitation |
| ACDelco 41-156 | GM OE | Iridium | 0.030 in | 0.98 in | Tapered | Select 2018+ 1.5L Equinox | OE-oriented replacement | Not for every Equinox |
| NGK 4344 | Aftermarket | Iridium | Application-specific | 25 mm | Tapered | Select 2010–2017 2.4L Equinox | Fine-wire iridium design | Engine-specific |
| DENSO 5338 | Aftermarket | Iridium | 0.044 in for listed application | Application-specific | Application-specific | Select 2010–2017 2.4L Equinox | Fine 0.4 mm electrode | Engine-specific |
The most important difference is application compatibility. The ACDelco 41-156 is aimed at newer 1.5L Equinox applications, while NGK 4344 and DENSO 5338 are options for compatible older 2.4L applications.
That means there is no single “best” plug based only on brand. The best choice is the one that matches the engine’s original specification.
How to Choose Spark Plugs for a Chevy Equinox
Before ordering a replacement, identify your exact Equinox.
Start with the model year and engine size. If possible, use the VIN to confirm the engine and parts application.
Then check the following specifications:
- Spark-plug part number
- Thread diameter
- Thread reach
- Hex size
- Seat type
- Electrode material
- Heat range
- Spark-plug gap
- Ground-electrode design
This is especially important because Equinox engines have changed significantly over the years.
For a newer 1.5L Equinox, the ACDelco 41-156 may be appropriate when the vehicle’s application calls for GM 12683541.
For a 2010–2017 2.4L Equinox, NGK 4344 and DENSO 5338 can be considered when their respective application information matches the vehicle.
Never assume that a spark plug fits simply because the product page contains the words “Chevy Equinox.”
Iridium vs. Platinum Spark Plugs
Iridium is commonly used in modern spark plugs because it can withstand high temperatures and wear while supporting a fine center electrode.
A fine electrode can help create a concentrated ignition point and allows manufacturers to design compact firing ends.
Platinum is also a durable electrode material, and platinum spark plugs can work very well in applications designed for them.
However, I would not choose between iridium and platinum solely based on which material sounds better.
The engine manufacturer’s specified spark-plug design should come first.
Why Spark Plug Gap Matters
The spark plug gap is the distance between the center electrode and ground electrode.
The ignition system needs enough voltage to jump this gap and create the spark that ignites the air-fuel mixture.
If the gap is incorrect, ignition performance can be affected.
The correct gap depends on the engine and spark plug.
For example, the ACDelco 41-156 is listed with a 0.030-inch gap, while the DENSO 5338 is listed with a 0.044-inch gap for the relevant 2.4L application.
Those differences demonstrate why you should never assume that every Equinox uses the same spark-plug gap.
Understanding Spark Plug Heat Range
The heat range describes the spark plug’s ability to transfer heat away from its firing end.
A plug with an incorrect heat range may not operate within the intended temperature window.
For a stock Chevrolet Equinox, I recommend using the manufacturer’s specified heat range rather than experimenting with a hotter or colder plug.
Performance modifications can change spark-plug requirements, but a standard street-driven Equinox should generally remain with the application-specific specification.
Why Thread Reach Matters
Thread reach is the length of the threaded portion of the spark plug.
The correct reach allows the plug to sit at the intended position in the cylinder head.
Using a plug with an incorrect reach can cause serious problems.
This is another reason why you should not choose spark plugs based only on thread diameter.
Two plugs may have the same thread diameter but different reaches or seat designs.
OEM vs. Aftermarket Spark Plugs
OEM-style spark plugs are designed around the original vehicle application.
The ACDelco 41-156 is particularly attractive for compatible Equinox models because it is a GM Original Equipment spark plug.
NGK and DENSO provide strong aftermarket alternatives.
My approach is to choose the correct specification first and the brand second.
A correctly specified NGK plug is a better choice than an incorrectly specified ACDelco plug, and the same is true in reverse.
Spark Plug Installation Tips
Before installation, make sure the engine is cool.
Remove any dirt or debris around the spark-plug area.
When the old plug is removed, inspect its condition.
Look for:
- Heavy carbon deposits
- Oil contamination
- Damaged electrodes
- Cracked ceramic
- Unusual discoloration
- Excessive wear
Compare the new plug with the old one before installation.
Check the:
- Part number
- Thread
- Reach
- Seat
- Electrode design
- Gap
Start the replacement plug by hand.
If it does not turn smoothly, stop and check the threads.
After hand installation, tighten the plug according to the correct specification for your engine.
Do not use a generic torque value for every Equinox.
Signs Your Chevy Equinox Needs New Spark Plugs
Worn spark plugs can contribute to several drivability problems.
Common symptoms include:
- Rough idle
- Hard starting
- Engine hesitation
- Reduced acceleration
- Misfire
- Poor engine response
- Check-engine light
- Reduced fuel economy
However, these symptoms can also come from other problems.
An ignition coil, injector, wiring problem, vacuum leak, compression issue, or engine-management fault can create similar symptoms.
If replacing the correct spark plugs does not solve a misfire, continue diagnosing the vehicle rather than repeatedly replacing plugs.
Common Spark Plug Mistakes to Avoid
Buying by Vehicle Name Only
Searching for “Chevy Equinox spark plugs” without specifying the engine can result in the wrong product.
Always check the model year and engine.
Assuming All Equinox Models Use the Same Plug
They do not.
The Equinox has had multiple engines and spark-plug specifications.
Ignoring Spark Plug Gap
Never assume the gap.
Check the exact specification for the plug and vehicle.
Re-Gapping Fine-Wire Iridium Plugs Incorrectly
Fine-wire electrodes can be damaged by improper adjustment.
If the manufacturer supplies the plug pre-gapped and instructs you not to change it, leave it alone.
Over-Tightening the Spark Plug
Too much torque can damage the threads or cylinder head.
Use the correct specification for your vehicle.
Cross-Threading
Always start the plug by hand.
If it does not thread smoothly, remove it and inspect the threads.
Ignoring the Old Spark Plug
The old plug can provide useful information about engine condition.
Heavy oil deposits or unusual electrode damage should not simply be ignored.
Assuming Every Misfire Is a Spark Plug Problem
A misfire has many possible causes.
If the problem remains after installing the correct plugs, inspect the ignition coil, fuel system, wiring, and engine mechanical condition.
Frequently Asked Questions
What are the best spark plugs for Chevy Equinox?
The best spark plugs for Chevy Equinox depend on the model year and engine. For compatible newer 1.5L applications, I would choose the ACDelco 41-156 because it is a GM Original Equipment iridium plug.
For compatible 2010–2017 2.4L models, NGK 4344 and DENSO 5338 are strong aftermarket iridium choices. The most important factor is exact compatibility. Before ordering, verify the vehicle year, engine, spark-plug number, gap, reach, and seat design.
Does every Chevy Equinox use the same spark plug?
No. The Chevrolet Equinox has been sold with several engines, and different engines require different spark-plug specifications. A newer 1.5L turbocharged Equinox does not necessarily use the same plug as an older 2.4L four-cylinder or V6 model.
This is why I recommend checking the VIN or exact engine information before ordering. Choosing by vehicle name alone can easily result in an incorrect plug.
Are iridium spark plugs good for a Chevy Equinox?
Yes, when iridium is specified for the particular Equinox application. Iridium offers excellent heat resistance and good wear resistance, making it useful for fine-wire spark-plug designs. The ACDelco 41-156, NGK 4344, and DENSO 5338 all use iridium center-electrode technology. However, an iridium plug is not automatically compatible with every Equinox. The complete spark-plug specification must match the engine.
What is the correct spark plug gap for a Chevy Equinox?
There is no single gap for every Chevrolet Equinox. The required gap depends on the engine and spark plug. For example, the ACDelco 41-156 is specified at 0.030 inch, while the DENSO 5338 is listed at 0.044 inch for its relevant 2.4L application. These differences show why using a generic Equinox gap value can be a mistake. Always verify the gap for your exact vehicle and plug.
How often should Chevy Equinox spark plugs be replaced?
The replacement interval depends on the specific Equinox engine and its maintenance schedule. Different generations have different recommendations, so I would not use one mileage number for every Equinox. Driving conditions and engine condition can also affect spark-plug wear. If the vehicle develops rough running, hesitation, hard starting, or a misfire, the spark plugs may need inspection before the scheduled interval.
Can bad spark plugs cause a Chevy Equinox to misfire?
Yes. Worn, fouled, damaged, or incorrectly gapped spark plugs can cause ignition problems and contribute to misfires. However, spark plugs are not the only possible cause. Ignition coils, fuel injectors, wiring, vacuum leaks, compression problems, and other engine faults can also cause a misfire. If replacing the plugs does not resolve the problem, the ignition and fuel systems should be diagnosed instead of repeatedly replacing spark plugs.
Should I use OEM or aftermarket spark plugs?
Both can be good choices when the exact specification is correct. I prefer an OEM or OE-related plug when I want the closest match to the original application. That is why the ACDelco 41-156 is my first choice for compatible newer Equinox applications. NGK and DENSO are strong alternatives for compatible applications. The most important factor is correct fitment rather than simply choosing OEM or aftermarket.
Can spark plugs improve Chevy Equinox fuel economy?
Replacing worn spark plugs can restore normal ignition performance if the old plugs are degraded. That may help the engine return to its normal fuel consumption. However, I would not describe spark plugs as a guaranteed fuel-economy upgrade. Fuel economy depends on many factors, including driving style, tire pressure, engine condition, weather, vehicle load, and fuel quality. A properly maintained engine with the correct spark plugs should operate as intended.
How do I know which spark plug fits my Equinox?
Start with the model year and engine. Then verify the original-equipment spark-plug number or use VIN-based vehicle fitment information. Compare the replacement plug’s thread size, reach, seat, heat range, electrode configuration, and gap. Don’t rely on a listing that simply says “fits Chevy Equinox.” The exact engine and model year should match the spark plug’s application.
Should new iridium spark plugs be re-gapped?
Not automatically. Some iridium spark plugs are supplied with the correct factory gap, and manufacturers may specifically instruct users not to adjust them. Fine-wire electrodes can be damaged by improper bending. Check the exact manufacturer’s instructions before changing the gap. If the plug is incorrectly gapped for your application, using a correctly specified replacement is safer than forcing the electrode into position.
Can I replace Chevy Equinox spark plugs myself?
Yes, many experienced DIY mechanics can replace Equinox spark plugs. The procedure generally involves removing the engine cover or ignition components, accessing the spark plugs, removing the old plugs, checking the replacement plugs, and installing them with the correct torque. The exact procedure varies by engine. If you are not comfortable working around ignition components or cylinder-head threads, professional installation may be a better option.
What happens if I install the wrong spark plug?
The wrong spark plug can have an incorrect heat range, gap, reach, thread, or seat. Depending on the mismatch, the engine may misfire, run poorly, or experience more serious mechanical problems. Even if the plug physically threads into the cylinder head, that does not prove that it is correct. Always verify the application before installation.
Should ignition coils be replaced with spark plugs?
Not automatically. Ignition coils do not need to be replaced simply because spark plugs are being changed. If the coils are functioning properly, they can normally remain in service. If the vehicle has a persistent misfire, however, the ignition coil should be included in the diagnostic process. Replacing working coils unnecessarily can increase repair costs without fixing the actual problem.
Is the ACDelco 41-156 compatible with every Equinox?
No. The ACDelco 41-156 is an application-specific spark plug. It is listed for numerous Equinox models using the 1.5L engine, including multiple model years from 2018 onward. It should not be assumed to fit older 2.4L or V6 Equinox applications. Verify your exact engine and vehicle before ordering.
Is NGK 4344 good for a Chevy Equinox?
NGK 4344 can be a good choice for compatible 2010–2017 Chevrolet Equinox 2.4L applications. It uses NGK’s Iridium IX design and a fine-wire iridium center electrode. However, it should not be treated as a universal Equinox spark plug. Verify that your specific 2.4L application calls for NGK 4344 or its corresponding specification before purchasing.
Is DENSO 5338 good for a Chevy Equinox?
DENSO 5338 is a suitable iridium option for compatible 2010–2017 Chevrolet Equinox 2.4L applications. It uses DENSO’s Iridium Power design with a fine center electrode and U-groove ground electrode. As with the NGK option, the exact application should be verified before installation because different Equinox engines require different spark-plug specifications.
Conclusion
Choosing the best spark plugs for Chevy Equinox is mainly about finding the correct application rather than simply choosing the most expensive or most heavily marketed spark plug.
For compatible newer 1.5L Equinox models, my first choice is the ACDelco GM Original Equipment 41-156 Iridium Spark Plug. It provides an OE-oriented iridium design and is a straightforward replacement when your vehicle calls for GM part 12683541.
For compatible 2010–2017 2.4L Equinox models, I would consider the NGK 4344 Iridium IX Spark Plug. It offers a fine-wire iridium design from an established spark-plug manufacturer.
The DENSO 5338 Iridium Power Spark Plug is another strong choice for the same type of compatible 2.4L application. Its fine iridium center electrode and DENSO’s Iridium Power design make it a useful alternative to NGK.
Before placing an order, verify your Equinox’s model year, engine, VIN, spark-plug part number, gap, heat range, thread reach, and seat design.
If your vehicle specifically calls for the ACDelco 41-156, that is the plug I would choose first. If you own a compatible older 2.4L Equinox, NGK 4344 and DENSO 5338 are both worth considering. The correct fitment should always come before brand preference.