Best Spark Plugs for Jeep Grand Cherokee 5.7 Hemi – Reviews w/FAQs

Spark plug is a cheap but very crucial component for the engine. Like other combustion engines, the Jeep Grand Cherokee 5.7 Hemi requires the appropriate spark plugs to run smoothly.

Ignition plug comes with a specific lifespan (around 30,000 miles); after that, you need to change the old ones. If the 5.7 hemi of your jeep doesn’t run smoothly and performs poorly for damaged spark plugs or old ones, then you have to change those as soon as possible to get rid of all the problems related to this crucial component.

But all spark plugs are not compatible with the 5.7 hemi engine of your Jeep Grand Cherokee. So you must replace the bad or old spark plugs with the new and suitable ones. Here are the 10 best spark plugs that will perfectly fit the jeep grand cherokee 5.7 hemi engine.

The List of 7 Spark Plugs for Your 5.7 Hemi Engine

When getting spark plugs for your Jeep Grand Cherokee 5.7 Hemi there are few factors you need to keep in mind, which will be discussed further in the article. To help in your journey of finding the best spark plugs I have put together 7 reviews of spark plugs you can get.

These platinum spark plugs are especially made with Yttrium ground electrodes and that’s why they have double the lifetime. The platinum fine-wire is used for better ignitability. The firing pin is laser infused, that’s why it has good resistance against corrosion.

The rolled threads give better resistance to corrosion and it comes with anti-seizing. The spark plugs are pre gapped but just to be on the safe side you should always check the gap size before installing.

The Bosch platinum spark plugs will eliminate the problems you are having due to faulty plugs. The spark plugs are reasonably priced so this could be a good choice as the replacement spark plugs for your Grand Jeep Cherokee 5.7 Hemi engine. You will get the feel of driving a brand new engine when you install these spark plugs by improving the mileage and giving more power so you can accelerate like before.

The OEM part number is 6717 and the plugs are compatible with 1997–2004 Jeep Grand Cherokee.

Pros:

• Specially made with Yttrium ground electrode which provides double lifetime
• Platinum fine wire firing pin for better ignitability
• The platinum spark plugs are resistant to corrosion
• Comes with anti-seizing and pre gapped
• Reasonable price and provides good mileage

Cons:

• Going to the mechanic for the fitting is advised if you are a novice.

The perfect choice if you are looking to get a kit where you will get the ignition coils, spark plugs and the tuning up kit. This kit is ideal for those looking to get everything in one go which saves the hassle of looking for other spare parts which is a timesaver and this is a bargain deal with the price being reasonable.

The kit has the Champion double platinum spark plugs which are OEM replacement spare parts making the installation easier. The ground electrode and the platinum center will give you the accelerating power you have been missing.

The OE replacement spark plugs will solve the misfiring problems with the engine light constantly reminding you that it is not running at its peak. These spark plugs are tested on extreme conditions and temperatures giving you the best experience when you replace it with these parts.

Compatible With 2003-2005 Jeep With 5.7L Hemi and the OEM numbers SPLZTR5A13, SPRE14MCC4

Pros:

• The set come with 8 spark plugs and 8 ignition coils
• Includes wire tune up kit and saves time.
• Tested to work in bad conditions.
• It will work in high temperatures.
• A fine-wire center electrode increases ignitability.

Cons:

• Have to pay more as it is a kit of coils and plugs

From the name you can deduce that the Champion spark plugs are made up of copper. If you are looking for reasonably priced aftermarket plugs for your 5.7 Hemi Jeep Grand Cherokee this is a good choice.

The spark plugs do not come pre gapped so you have to gap it yourself with a gapper tool. This is why the installation can take up some time but as you will be using them for at least 30,000 miles you should always take the time to install them properly. The estimated time mentioned to change the spark plugs is recommended by the brand. Other high quality spark plugs have similar longevity so when compared to the price this is a wise choice indeed.

Although these spark plugs are of good quality you cannot use them on modern engines but can be used on older models of Jeep. These Champion Copper Plus spark plugs are compatible with 1999-2004 Jeep Grand Cherokee and the OEM part number is ‎570.

Pros:

The spark plugs are corrosion resistant
Easy to installation process
After installation you will be getting great fuel mileage

Cons:

The spark plugs are copper

The reliable and trusted brand NGK has been making spare parts for automobiles for centuries now. They are renowned for making good quality spark plugs which last longer. To make your life easier the spark plugs are pre gapped and they are also OEM replacement parts which will make the installation process fairly easy. But always check the gap to make sure it meets your engine’s requirements.

After installing these spark plugs will fix the typical problems caused by the faulty plugs. And the spark plugs are reported to have a longer lifespan if it’s cleaned and maintained properly.

The genuine NGK spark plugs set come with 16 pieces which are the perfect number to order for your 5.7 Hemi motor on Jeep Grand Cherokee. The pre gapped size of the plugs are 0.044 inches and it’s the perfect size for your engine. The manufacturing number is 4024174937 and it is compatible with 1999–2004 Jeep Grand Cherokee.

Pros:

The spark plugs set come with 16 pieces.
Lowers emissions with high mileage
Crafted to OEM specifications for effortless installation
A very affordable purchase

Cons:

The spark plugs are made of copper.

ENA is a trusted brand which has been making spare parts such as ignition coils and spark plugs for a long time. The iridium spark plugs are reliable and durable which gives your 5.7 Hemi the ability to run as smooth as silk while giving you more power to play with.

With its modern design and technology it can maintain the heat better which provides better ignitability for the motor. This is why you will be getting better fuel mileage than before. The spark plugs will also fix common issues caused by faulty spark plugs such as misfiring and incredible shaking of the panels when the engine is in idle.

The OE spec spark plugs are easy to install which goes through a lot of testing so you can drive in the worst condition possible while your engine will perform at top efficiency. Even though the set of spark plugs and ignition coils are on the expensive side it can be the best choice for you. The ENA set is compatible with 2014-2016 Jeep Grand Cherokee 5.7 Hemi and the OEM part number is C1649 UF601 52, 2061 5149049AB 92145.

Pros:

The OE spec spark plugs are made of platinum alloy.
Durable and reliable for better ignitability
Better than standard plugs
Installation process is simple and easy

Cons:

Little bit on the expensive side

If your Grand Cherokee is one of the more recent models from 2014 to 2016 this set is the one for you. Denso spark plugs, a dependable brand name in the automotive industry come with this set of ignition coils and spark plugs. The platinum spark plugs that come with the set are a bargain as they will last three times longer than the standard copper plugs.

You should get this set to boost your 5.7 Hemi’s overall performance . As it comes with both the coils and plugs you can install them at the same time which is the recommended process by professional mechanics. If the coils go bad then the spark plugs are also on their way to fail as well. Thus it is advised to change them both at the sametime.

The OE replacement spark plugs come pre gapped which are relatively easy to install but as always you should check if the gap size is the correct for your engine. When installed correctly the spark plugs will give better fuel mileage and can solve other issues as well like misfiring and shaking due to faulty plugs.

The set is compatible with 2014-2016 Jeep Grand Cherokee 5.7 Hemi and the OEM part number is ‎UF504.

Pros:

It has 16 pieces of high quality spark plugs
The plugs are made of platinum
OE spec replacement spark plugs for 5.7 Hemi
Set of ignition coils and spark plugs

Cons:

Expensive when compared to other sets

Buying Guide for Jeep Grand Cherokee 5.7 Hemi Spark Plugs

If you are looking to get spark plugs for your 5.7 Hemi Jeep Grand Cherokee then you won’t be spoiled for choices but the correct one needs research, research and more research. This is because you always have to keep a few things in mind when selecting the best spark plugs for your Jeep Grand Cherokee.

Compatibility with your Jeep Grand Cherokee

Generally, you would need to replace the spark plugs before the first 100,000 miles. The first thing you need to keep in mind when looking for spark plugs to replace is compatibility. If the spark plug you bought does not fit then you will be in a world of trouble. Returning the plugs and then waiting for the correct ones to arrive requires time and patience. But a simple check before purchasing will save a ton of time and energy. Compare the OEM part numbers so you can avoid the traumatic experience.

The material is just as important

It is absolutely necessary to get the best quality spark plugs for your 5.7 Hemi engine. There are three types of plugs and they are:

• Copper spark plugs are best for older models and for the modern engines you should either get the platinum or the iridium.
• Platinum Spark Plug will get you the most out of your money as these are mid ranged plugs. The double platinum is expensive then the single one but performs better than the later.
• Iridium Spark Plugs will provide the best outcome, you should get the double iridium which is expensive but guaranteed to give you the performance you desire

Always remember to use the replacement part recommended by the manufacturer.

Different spark plugs has different sizes

When choosing the spark plug for your Jeep Grand Cherokee 5.7 Hemi you have to ensure that it is the correct size for your engine head. Spark plugs need to fit perfectly otherwise the same problems before replacing will still persist. There are also different thread sizes which you need to compare so you can find the compatible size for your motor. Compare the owner’s manual to determine which size will be the perfect fit for your 5.7 Hemi motor.

Knowing the correct Gap

The spark plug gap size is different with each engine and the gap determines how much voltage your engine needs to ignite the fuel. Almost all spark plugs come pre gapped but to save time you should always check and match if the spark plugs you bought are the correct one for your engine. Generally, the perfect gap for the 5.7 Hemi is 0.43 inches. You can determine the gap using a gapper tool to measure the gap before installing them in your motor.

Pricing

The price range depends on the type of spark plugs you are gonna get. The copper ones are the cheapest and the double iridium ones are the most expensive. I recommend going for the midrange one, the double platinum to get the maximum output for your money.

Warranty of the spark plugs

The warranty can determine how good the plugs really are. In general, 1 year warranty is good when dealing with replacement spare parts but the bargain deal is, if it has more than 3 years of warranty. The longevity should also be kept in mind as 30,000 to 60,000 miles lifespan is the acceptable choice for replacement spark plugs.

Tips

• Getting the best quality spark plugs will increase your engine’s performance and it is the wise decision.
• When replacing the spark plugs it is recommended to replace the spark plug wires and the ignition coils as well to help the motor perform better.
• A good servicing always ensures the longevity of the spark plugs.

What are the signs of bad spark plugs?

If your check engine light is on then it is time you need to change the spark plugs. Along with the check engine light there are few more signs such as:

• If your car’s panels are shaking when waiting for the light to turn green is a sign that your spark plugs need changing.
• When you are having trouble starting your engine or it takes longer than usual.
• The high fuel mileage is also a clear sign for you to change the spark plugs.
• The lack of power is also a definite sign.

These are not only signs of faulty spark plugs, if the ignition coils are bad as well then you will have similar symptoms. This is the reason why you should always change the coils along with the plugs.

FAQs

How many spark plugs do I have to buy for my Jeep Grand Cherokee 5.7 Hemi?

16 spark plugs are needed for the 5.7 Hemi motor.

Which are the better spark plugs, iridium or platinum?

Iridium spark plugs melting point is higher than platinum thus it has better strength and stability. However, platinum is a hard metal alloy also but it is cheaper than iridium.

When should I change the spark plugs in my 5.7 Hemi Jeep Grand Cherokee?

To avoid damage done by overused spark plugs you should replace them before reaching 100,000 miles. Although some spark plugs can last more miles than that it is always recommended to change them between 100,000 miles to 120,000 miles.

Conclusion

When you are looking to buy spark plugs for your Jeep Grand Cherokee then you have to be mindful of a few things. As spark plugs improve the engine’s performance, give better fuel mileage and stop the unnecessary jittering it is highly recommended that you keep a few key factors in mind.

The factors to keep in mind are discussed above and it is there as a guide to help you get the best spark plug for your 5.7 Hemi motor. This is the reason why I compiled this list which will help you to get the plugs you need without all the hassle. So what are you waiting for, Christmas? Scroll up and get the plug you need.