Best Spark Plug Gappers for 2024

We analyzed top picks from leading reviewers to find the best for every need
Published: March 11th, 2024
Last Updated: March 12th, 2024

⚙️Getting that spark plug gap just right is key to making your vehicle's engine run smoothly. Whether you're a veteran mechanic or just someone who likes to DIY their car maintenance, a good spark plug gapper can be a game-changer.

We took a close look at various gappers, judging them on precision, ease of use, durability, and overall value. Here are our top picks for the best spark plug gappers in 2024:

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Overall Best: Performance Tool W80524

The Performance Tool W80524 tops our list for its excellent construction and high accuracy. With a measurement range from .025 to .100 inches, it accommodates most standard spark plugs. What sets this tool apart are its easy-to-read markings and user-friendly design, making it a favorite among both professionals and hobbyists. Its robust build ensures long-term durability, maintaining precise gapping over countless uses. If you're looking for a reliable and accurate spark plug gapper, the Performance Tool W80524 is the best overall choice.

Lowest at any Popular Retailer
$11.70 at Amazon

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Runner-up: Model A Spark Plug Gapper

CTA Tools 3235 Spark Plug Gapper

The Model A Spark Plug Gapper stands out for its ergonomic design and simplicity of use. This tool makes the gapping process quick and efficient, thanks to its comfortable grip and easy operation. It's built to last, offering precision and reliability that both professionals and casual users will appreciate. While it scores high in performance, its slightly higher price prevents it from taking the top spot, making it our runner-up.

Lowest at any Popular Retailer
$5.59 at Amazon

More Answers

Still curious about the CTA Tools Spark Plug Gapper? Here are some answers you might find interesting:

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Is the CTA Tools 3235 Spark Plug Gapper easy to use?
The CTA Tools 3235 Spark Plug Gapper is pretty straightforward to use, which is nice to have in your toolbox. It's small and portable enough to fit in your pocket or hang onto a keychain—super handy when you need it quickly. The trade-off is that it doesn't come with its own case, but that portability is actually what makes it user-friendly. Our research shows it's built from tough materials that can handle regular use, with clear markings that help you get those spark plug gaps right without much hassle. Some folks mention slight issues with the precision, but the general consensus is that it works well, especially for typical adjustments. Even without a case, you can easily slip this little tool into your toolbox without taking up much space. If you're worried about keeping it in good shape, just wipe it down with a bit of [WD-40](https://www.shopsavvy.com/redirect?url=https%3A%2F%2Fwww.amazon.com%2Fs%3Fk%3DWD-40%26tag%3Dssw.ans.tx-1-20) or mild soap now and then to keep it clean and accurate. If you really want a case, maybe repurpose a small pouch or container you have lying around. It'll protect the tool and stop you from misplacing it. All in all, for basic tasks, the CTA Tools 3235 is a solid and easy-to-use choice in affordable spark plug gappers.
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What material is the CTA Tools 3235 Spark Plug Gapper made of?
The CTA Tools 3235 Spark Plug Gapper is made from die-cast material, which, according to the manufacturer's product description, should make it pretty durable. It's built to last and handle regular use. This tool is quite straightforward to use, which makes it handy whether you're a DIYer or a professional mechanic. From what we found, it also has easy-to-read measurement markings, which are super helpful for getting the spark plug gap just right. That adjustment is key to keeping your engine running smoothly, as it helps maintain efficient combustion and wards off engine troubles. While a lot of folks seem to like it for its simplicity and the fact that it fits nicely into a toolbox or even onto a keyring, we've seen some mixed opinions about its accuracy. Some people think it's spot-on, but others have noticed that the measurements can vary a bit when compared to more precise tools like [micrometers](https://www.shopsavvy.com/redirect?url=https%3A%2F%2Fwww.amazon.com%2Fs%3Fk%3Dmicrometers%26tag%3Dssw.ans.tx-1-20) or [digital calipers](https://www.shopsavvy.com/redirect?url=https%3A%2F%2Fwww.amazon.com%2Fs%3Fk%3Ddigital%2Bcalipers%26tag%3Dssw.ans.tx-1-20). So, for everyday use and general adjustments, the CTA Tools 3235 can be really convenient. But if you need everything to be super precise, it might be worth double-checking the gaps with another tool, like a [feeler gauge](https://www.shopsavvy.com/redirect?url=https%3A%2F%2Fwww.amazon.com%2Fs%3Fk%3Dfeeler%2Bgauge%26tag%3Dssw.ans.tx-1-20), just to be on the safe side. This way, you can be more certain that your engine is performing its best and isn’t thrown off by any small discrepancies in spark plug gaps.
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How accurate is the CTA Tools 3235 Spark Plug Gapper?
The CTA Tools 3235 Spark Plug Gapper seems to be a hit among car enthusiasts and mechanics because it's pretty straightforward to use and feels solid. You can tweak spark plug gaps accurately, which is a big deal for getting your engine to run smoothly. According to the manufacturer, it covers a range from .020" to .100", so it's versatile enough for different plug sizes. The gapper is made from durable die-cast material, and folks generally like its handy size—it even hooks onto a keyring. That's a bonus if you're often tinkering around with cars. But, here's the catch: our research indicates that while many people find it reliable, some have pointed out that its measurements can sometimes be a bit off. If your car's engine requires spot-on measurements, it might be wise to double-check gaps with other tools just to be sure. Overall, it's a decent tool for anyone who regularly does vehicle maintenance, but just keep in mind that it might not always be 100% accurate on its own. If precision is crucial, using an extra tool to verify could save you from potential hiccups.
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Budget Pick: Lisle 20250

Lisle 20250 Compression Tester

For budget-conscious buyers, the Lisle 20250 offers significant value without compromising on performance. Its straightforward design is perfect for occasional users or those working within a tight budget. While it may not be the most durable option, it effectively handles basic gapping needs at a fraction of the cost. It’s the go-to choice for anyone seeking functionality without frills.

Lowest at any Popular Retailer
$34.15 at Amazon

More Answers

Still curious about the Lisle Compression Tester? Here are some answers you might find interesting:

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How accurate is the Lisle 20250 Compression Tester?
The Lisle 20250 Compression Tester is a favorite among DIYers and pros alike for checking engine health. Our research shows it's designed to accurately measure compression in gasoline engines, handling pressures up to 300 PSI (or 2100 kpa), so it's pretty versatile for different projects. One thing that sets the Lisle 20250 apart is that it works with 14mm and 18mm spark plug threads. This makes it handy for both cars and motorcycles. According to our data, this flexibility is a big plus for many, adding real value to any toolkit. Speaking of build quality, the Lisle 20250 doesn't disappoint. It’s made with durable materials like a tough hose and brass fittings, which ensure a good seal while testing. Some folks have mentioned that the adapter might loosen when unscrewing, which can be a bit of a hassle, but it generally doesn’t mess with its overall reliability. As for accuracy, that's a highlight. Most feedback suggests it gives consistent, clear readings—critical for figuring out engine issues. However, there have been a few notes about the gauge's accuracy and the pressure release valve having some hiccups. Even so, the overall impression of this tester is positive, with many praising its precision. Considering what it costs, the Lisle 20250 offers solid value. It's a solid option if you're working on engines regularly, whether you're a professional or just love tinkering at home. It's a trustworthy tool that combines functionality and affordability, which is why it's often recommended for those needing a reliable compression tester.
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What thread sizes does the Lisle 20250 Compression Tester fit?
The Lisle 20250 Compression Tester fits 14mm and 18mm thread sizes, which makes it pretty versatile for different types of gasoline engines. According to the manufacturer's description, it can handle pressures from 0 to 300 PSI, so it covers a good range for most automotive applications. It even works well for things like outboard racing engines, based on what we've found. From our research, people generally like how easy it is to use, and it holds up well over time. The build seems really solid with features like a sturdy hose and brass fittings, which definitely add to its durability. The design ensures a snug fit with rubber seals on the adapters to prevent leaks. There are a few small downsides. Some folks mentioned that the pressure release valve is a bit stiff, which can be a hassle. And occasionally, there are some mixed comments about the gauge accuracy when compared to other testers. Plus, it doesn't come with a carrying case, so if you need something portable, that might be a bit of a bummer. Overall, it seems like a good pick for both DIYers and professionals. It's reliable, effective, and fairly priced, making it a popular choice for engine diagnostics. Just something to think about if you're weighing your options.
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What PSI range does the Lisle 20250 Compression Tester measure?
The Lisle 20250 Compression Tester measures engine compression in the range of 0 to 300 PSI (0 to 2100 kPa), according to the manufacturer's specs. This makes it pretty versatile for checking out different diagnostic needs. It's designed to work with 14mm and 18mm thread sizes, so it can fit a variety of vehicles, which is nice if you're tackling different kinds of engine work. From what we've gathered, folks find it pretty easy to use, with clear instructions that make it approachable even for those who aren't super experienced. Our research shows that the Lisle 20250 generally gets a thumbs-up for delivering reliable readings that match up with factory specifications, making it a solid tool for figuring out engine compression issues. But, it's worth noting that sometimes readings can slightly differ when compared with other testers. As for its build, it's mostly robust and comes with various adapters, which adds to its usefulness. Some have pointed out that the pressure release valve might need a good grip to work, and while parts like the hose and brass fittings seem sturdy, a few have mentioned that the gauge itself might not feel as durable. Overall, the Lisle 20250 is seen as a dependable performer by both pros and DIY fans who appreciate its adaptability and effectiveness in diagnostics, even if it does have some minor quirks.
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Best for Durability: Ares 70012

Cardone 73-70012 Remanufactured Relay Control Module, RCC/RCM, Compatible with 1999-2004 Ford Mustang

Known for its durability and accurate measurements, the Ares 70012 is an excellent choice for those prioritizing robustness. This electronic spark plug gapper provides quick and precise adjustments, making it ideal for professional use. Its superior build quality ensures it can withstand regular, heavy use, delivering consistent results over time. For mechanics who need a reliable tool that can endure frequent usage, the Ares 70012 is hard to beat.

Lowest at Amazon
$211.93 at Amazon
Lowest at any Popular Retailer
$205.42 at Walmart

Best Value: Model B Spark Plug Gapper

The Model B Spark Plug Gapper combines affordability with solid performance, making it the best value pick. Lightweight, compact, and easy to store, it’s an excellent option for those who need a dependable tool without breaking the bank. Although it doesn't have the same durability as some higher-end models, it performs admirably for regular use. If you’re looking for a spark plug gapper that balances cost and functionality, the Model B is a smart choice.

Available at Amazon
View at Amazon
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