Spark Plugs
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- NGK®Laser Iridium™ Spark PlugLaser Iridium™ Spark Plug by NGK®. NGK manufactures all types of spark plugs and glow plugs featuring the latest in technology. Manufactured with both laser welded Iridium center electrode tip and a platinum disc welded to the...Laser welded Iridium center electrode tipPlatinum disc welded to backside of ground electrode provides long life$7.67 - $23.10
- Denso®Iridium TT™ Spark PlugIridium TT™ Spark Plug by Denso®. Is your vehicle hard to start? Does it miss under load and idle rough? Is your gas mileage not what it used to be? Your ignition system may need repair, but before you waste your time and gas running...Designed to replace your factory spark plugsManufactured to stringent quality standards$6.64 - $11.63
- ACDelco®GM Original Equipment™ Iridium Spark PlugGM Original Equipment™ Iridium Spark Plug by ACDelco®. If you want to restore the original performance of your vehicle's ignition system, this product is what you need. Engineered to stringent OE specifications, it is sure to fit and...Manufactured to restore your vehicle’s ignition systemDesigned with your specific vehicle in mind$7.57 - $19.99
- NGK®HX™ Ruthenium Spark PlugHX™ Ruthenium Spark Plug by NGK®. NGK Spark Plugs is introducing the latest technology in high ignitability spark plugs to the automotive aftermarket NGK Ruthenium HX™. The ultimate high ignitability spark plugs from NGK. Modern...DFE & PSPE™ tip designsSuperior oxidation resistance$10.12 - $11.40
- Denso®Iridium Long-Life™ Spark PlugIridium Long-Life™ Spark Plug by Denso®. Denso's patented Iridium alloy is more durable than even Platinum, allowing the center electrode to be shrunk to only 0.7 mm in diameter. This produces a dramatic improvement in ignitability...Manufactured to boost your engine’s performanceEngineered utilizing the finest materials and equipment$6.57 - $16.70
- Autolite®Platinum Spark PlugsPlatinum Spark Plugs by Autolite®. Want to upgrade the ignition system of your vehicle to get ultimate combustion and maximum horsepower? Step up to Autolite. Featuring the ground-breaking design, this product guarantees to deliver...Wise investment to get an efficient ignition system upgradeWill provide improved ignitability and engine performance$2.33 - $7.75
- TRQ®Spark Plug SetSpark Plug Set by TRQ®. This top-notch TRQ spark plug set is made to fix spark plug problems easily. With its help, you will restore your vehicle's quick starting. Plus, installing it is a simple task.Manufactured to restore your vehicle’s ignition systemDesigned with your specific vehicle in mind$29.40 - $100.83$30.95 - $103.95Save up to 6%
- NGK®Iridium IX™ Spark PlugIridium IX™ Spark Plug by NGK®. NGK manufactures all types of spark plugs and glow plugs featuring the latest in technology. Designed for performance enthusiasts who want extreme ignitability, improved throttle response and superior...Fine Iridium tip ensures high durability and a consistently stable sparkIridium alloy has extremely high melting point, perfect for today’s high-tech, high-performance engines$6.85 - $8.51
- Denso®Iridium Power™ Spark PlugIridium Power™ Spark Plug by Denso®. Iridium Power™ best demonstrates its performance improvement during acceleration. The world's smallest center electrode and specially shaped ground electrode delivers maximum spark energy while...OE quality parts from top original equipment and aftermarket manufacturerThe finest quality at a great price$5.95 - $29.79
- Motorcraft®Spark PlugSpark Plug by Motorcraft®. Is your vehicle hard to start? Does it miss under load and idle rough? Is your gas mileage not what it used to be? Your ignition system may need repair, but before you waste your time and gas running out to...Direct OEM replacementRecommended by Ford Motor Company$1.38 - $22.62
- NGK®G-Power™ Spark PlugG-Power™ Spark Plug by NGK®. These spark plugs by NGK are designed to improve fuel efficiency, lower emissions, and provide quicker starts while remaining durable under high heat. With their 0.6 mm platinum alloy tip laser welded to...Fine platinum tip reduces required voltageExtremely durable under high heat$2.63 - $5.59
- ACDelco®Gold Rapidfire Spark PlugsGold Rapidfire Spark Plugs by ACDelco®. Designed utilizing the latest technology, this product features premium quality and will perform better than advertised. Perfect for your vehicle and lifestyle, it is manufactured to meet or...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$4.75 - $5.85
- Champion®Copper Plus Spark PlugCopper Plus Spark Plug by Champion®. Built with nickel alloy center and ground electrodes, these spark plugs provide extra durability for long-lasting service life, while the extrusion of copper into the core of their center electrode...Dependable and durableBuilt to ISO and SAE standards for proven performance$1.23 - $34.62
- NGK®Laser Platinum™ Spark PlugLaser Platinum™ Spark Plug by NGK®. NGK manufactures all types of spark plugs and glow plugs featuring the latest in technology. Laser Iridium™ spark plugs provide superior ignitability and long service life. Smallest tip diameter...Laser welded Platinum center electrode tipPlatinum disc welded to backside of ground electrode provides long life$5.32 - $16.37
- ACDelco®GM Original Equipment™ Spark PlugsGM Original Equipment™ Spark Plugs by ACDelco®. If you want to restore the original performance of your vehicle's ignition system, this product is what you need. Engineered to stringent OE specifications, it is sure to fit and...Manufactured to restore your vehicle’s ignition systemDesigned with your specific vehicle in mind$2.45 - $20.41
- Motorcraft®Platinum Spark PlugPlatinum Spark Plug by Motorcraft®. If you want to restore the original performance of your vehicle's ignition system, this product is what you need. Engineered to stringent OE specifications, it is sure to fit and function the same or...Direct OEM replacementRecommended by Ford Motor Company$2.32 - $16.32
- NGK®V-Power™ Spark PlugV-Power™ Spark Plug by NGK®. Spark plugs offer higher performance compared to standard plugs. Spark plugs feature a V-groove center electrode and concave ground electrode that lowers ignition voltage requirements while guiding the...Lowers ignition system voltage requirementsGreater ignitability and performance over conventional spark plugs$1.70 - $36.62
- Champion®Iridium Spark PlugIridium Spark Plug by Champion®. As the leaders in precious metal technologies as well as F.I.S.S resistor technology and MLR™ technology, Champion spark plugs provide enhanced ignition and longer life.Iridium center electrodes and "laser-locked" platinum ground electrodes ensure maximum lifeFine-wire electrode and platinum V-trimmed ground electrode produce the sharpest spark focus$4.59 - $15.73
- Denso®Original U-Groove Spark PlugOriginal U-Groove Spark Plug by Denso®. Denso's patented U-Groove spark plug enables complete combustion by allowing the spark to fill the gap created by the U shape. The ball of fire created in the U-Groove develops a larger and hotter...Manufactured to restore your vehicle’s ignition systemDesigned with your specific vehicle in mind$1.52 - $6.28
- Bosch®OE Specialty Nickel Spark PlugOE Specialty Nickel Spark Plug by Bosch®. Replace your worn out spark plugs with Bosch spark plugs and experience miles of worry-free driving. OE Specialty Spark Plugs ensure safe and reliable performance, same as your OE plugs, so you...Designed to meet or exceed OE specificationsMatch the fit, form, and function of the OE design$1.56 - $14.36
- NGK®Standard Nickel Spark PlugStandard Nickel Spark Plug by NGK®. If you want to restore the original performance of your vehicle's ignition system, this product is what you need. Engineered to stringent OE specifications, it is sure to fit and function the same or...Manufactured to restore your vehicle’s ignition systemDesigned with your specific vehicle in mind$1.66 - $7.82
- Denso®Platinum TT™ Spark PlugPlatinum TT™ Spark Plug by Denso®. The Platinum TT™ concept originated from Denso's latest original equipment spark plug technology, the Super Ignition Plug (SIP). Until recently, this Titanium Enhanced Twin-Tip design could only be...Designed to replace your factory spark plugsManufactured to stringent quality standards$3.26 - $5.50
- Genuine®Spark PlugSpark Plug by Genuine®. If your engine ignition parts are in need of repair, don’t compromise the performance and safety of your car with suspect, off-brand replacement parts from the local auto parts chain store. On CARiD you'll find...Manufactured to restore your vehicle’s ignition systemDesigned with your specific vehicle in mind$15.40 - $112.14
- DIY Solutions®Spark Plug SetSpark Plug Set by DIY Solutions®. If you're seeking to get your steel stallion back to its tip-top condition, then this top-notch replacement solution is what you should definitely look out for. When it comes to quality, reliability and...Designed to help restore your vehicle to its former gloryQuick replacement to let you enjoy an awesome ride again$25.09 - $176.31$26.47 - $193.75Save up to 12%
- ACDelco®Gold Double Platinum Spark PlugGold Double Platinum Spark Plug by ACDelco®. Designed utilizing the latest technology, this product features premium quality and will perform better than advertised. Perfect for your vehicle and lifestyle, it is manufactured to meet or...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$6.30 - $7.26
- ACDelco®Professional™ Spark PlugProfessional™ Spark Plug by ACDelco®. Designed for today’s most popular autos, as well as several marine applications, ACDelco’s Rapidfire® Platinum Spark Plugs fit engines using conventional plugs, as well as newer vehicles...Ribless insulator that improves the plug-to-boot sealTapered center wire electrode with a platinum pad reduces the firing diameter and helps improve the firing efficiency by concentrating and directing energy needed to fire the plug with less voltage$1.90 - $7.08
- Motorcraft®Finewire Platinum Spark PlugFinewire Platinum Spark Plug by Motorcraft®. If you need to replace your worn-out spark plugs, Motorcraft is the way to go. Engineered specifically for your vehicle, their high melting point provides outstanding resistance to erosion...Direct OEM replacementRecommended by Ford Motor Company$2.84 - $9.41
- Motorcraft®Iridium Spark PlugIridium Spark Plug by Motorcraft®. If you want to restore the original performance of your vehicle's ignition system, this product is what you need. Engineered to stringent OE specifications, it is sure to fit and function the same or...Direct OEM replacementRecommended by Ford Motor Company$4.71 - $11.71
- Bosch®OE Specialty Platinum Spark PlugOE Specialty Platinum Spark Plug by Bosch®. Only Bosch uses a platinum center electrode that’s heat-fused into a ceramic insulator. All Bosch Platinum Series Spark Plugs reach self-cleaning temperature faster for quicker starts,...Manufactured to boost your engine’s performanceEngineered utilizing the finest materials and equipment$4.03 - $21.92
- Mopar®Iridium Spark PlugIridium Spark Plug by Mopar®. Replace your worn out spark plugs with these top-grade replacement spark plugs and get your vehicle back on the road. Designed with expert craftsmanship and extreme attention to detail, they provide the...Manufactured to restore your vehicle’s ignition systemDesigned with your specific vehicle in mind$1.04 - $77.99
For a gasoline powered internal combustion engine to run it must have the proper mixture of air and fuel, compression, and a well-timed spark. Fuel mixes with air in a carburetor, or in the intake manifold or port after the fuel injector on electronic fuel injected engines, and is then drawn into the cylinder through the intake valve when the piston descends on the intake stroke. The piston compresses the air/fuel mixture into a small, dense volume when it rises in the cylinder on the compression stroke. High voltage produced by the ignition coil is sent to the spark plug, which creates a spark igniting the air/fuel mixture, generating combustion pressure that forces the piston down on the power stroke. On a 4-cycle engine the spark plugs fire 300-400 times per minute at idle and 1000-1200 times per minute at cruising speed, and they do this for many thousands of miles. With that kind of firing frequency, it’s no surprise that even the best plugs wear out eventually, and when they do you can count on our replacement spark plugs to restore performance.
A typical spark plug consists of a copper core center electrode and metal terminal inside a ceramic insulator that is encased in a steel shell. The terminal connects the spark plug to the ignition system. The center electrode has a nickel alloy, platinum, iridium or other precious metal firing tip. Resistor spark plugs include a resistor with the center electrode to prevent electrical interference that can adversely affect radio reception and vehicle computer controls. The steel shell is threaded for secure fitment in the cylinder head and to provide a good ground and effective heat transfer from the plug to the cylinder head. The side electrode, or ground strap electrode, is made of high nickel steel that’s welded to the steel shell. Double platinum spark plugs have a platinum disc welded to the side electrode.
The ignition coil turns the 12 volts from the battery into 15,000-40,000 volts. The coil is directly connected to the spark plug on COP (Coil On Plug) ignition systems, connected via spark plug wire on DIS (Distributorless Ignition Systems), and via spark plug wire and distributor on breaker point and distributor-type electronic ignition systems. When the breaker points, ignition module, or ECU (Engine Control Unit) triggers the coil, the high voltage transmitted through the spark plug arcs across the gap from the center electrode to the side electrode and ignites the air/fuel mixture. The pressure created by combustion of the air/fuel mixture pushes the piston downward, providing the force that turns the crankshaft. While all spark plugs function the same way and have similar construction, they are tailored to their applications and ignition systems with different electrodes, thread sizes, seat type, heat ranges, and reach.
There are four common spark plug thread diameter x thread pitch combinations: M10 x 1.0, M12 x 1.25, M14 x 1.25, and M18 x 1.5. Spark plugs can have a flat seat that uses a gasket to seal the plug to the combustion chamber or a tapered seat where the spark plug shell forms the seal. A spark plug’s heat range is its ability to transfer heat from the combustion chamber to the cylinder head. On a “hot” spark plug, much of the ceramic insulator will be exposed to the combustion chamber, so it retains heat and burns off deposits. In contrast, very little of the ceramic insulator is exposed on a “cold” plug, enabling it to transfer heat better and run cooler. A plug that runs too hot for the application can cause pre-ignition and knock, and one that runs too cold can result in carbon buildup and misfire. Cold plugs are generally used on modified high-performance and racing engines. Spark plug reach is the distance the plug projects into the combustion chamber. The plug must project far enough for good combustion without getting too hot or hitting the piston and should not be so shallow that it’s shrouded, resulting in poor combustion.
Copper core spark plugs with nickel alloy firing tips, commonly called copper/nickel plugs, are usually specified for breaker point and some electronic distributor ignition systems because the softer nickel alloy erodes faster and won’t last as long as platinum or iridium when used on modern DIS and COP ignition systems. However, because they run cooler, copper/nickel plugs are used on some late-model performance engines. The firing tips on platinum plugs are much harder than copper/nickel plugs; they will retain their sharp edges and gap dimensions much longer than copper/nickel plugs, so you can count on many more miles of good performance. Platinum plugs also operate at a higher temperature, which resists carbon buildup. Some platinum plugs have fine-wire tips, which need less voltage to fire and increase firing efficiency.
Double platinum plugs were designed for DIS ignition systems. In a DIS system each coil supplies voltage to the spark plugs in two cylinders on every revolution of the crankshaft, with one spark plug firing in the cylinder on the compression stroke and the other in the opposite cylinder in the firing order that is on the exhaust stroke. Because the spark in the cylinder on the exhaust stroke has no effect on engine operation, this is commonly called a “waste spark” ignition system. A double platinum plug, with a platinum disc welded to the side electrode, is needed in this system because, while the spark plug in the cylinder on the compression stroke fires in the conventional manner, from the center to the side electrode, the spark in the cylinder on the exhaust stroke jumps from the side electrode to the center electrode. If spark plugs without platinum side electrodes are used in a DIS, the side electrode will wear prematurely.
Iridium is even harder than platinum, and iridium plugs last even longer than platinum, and now there are ruthenium-tipped plugs that are harder still. The hardness of precious metal tipped plugs is emphasized by vehicle makers and spark plug manufacturers because hardness provides durability. Harder electrodes will maintain their sharp edges and the plug gap longer, for good spark and consistent performance over many thousands of miles and extended change intervals. Along with precious metal and fine wire firing tips, some spark plug manufacturers form U-shaped or V-shaped channels in the side electrode or shorten or alter the shape of the side electrode to reduce the quenching effect that can be caused by conventional electrodes and cause incomplete combustion.
Every time a spark plug fires, a small amount of electrode material is lost, eventually resulting in rounded electrodes and wider gaps, which require more voltage to fire, and could cause misfire. This occurs on all spark plugs regardless of the type of electrode, it just takes materials like platinum and iridium longer to wear. In addition to normal wear, spark plugs are also subject to engine conditions like a rich air/fuel mixture, worn piston rings or valve seals that can cause fuel or oil fouling or excessive deposits, and detonation or pre-ignition damage caused by incorrect ignition timing, use of fuel with too low an octane, lean air/fuel mixture, defective EGR (Exhaust Gas Recirculation) system, or excessive carbon deposits in the combustion chamber. Symptoms of worn, fouled, or damaged plugs include misfire, rough idle, hard starting, poor acceleration and reduced fuel mileage. Spark plugs should be replaced when recommended by the vehicle manufacturer or when there are symptoms of poor performance. Upon removal, plugs should be examined for evidence of the engine conditions described above.
The engine design dictates spark plug features like diameter, thread pitch and seat, but other features like heat range can be changed. However, unless the engine has been significantly altered and you are an experienced tuner, when replacing spark plugs you should stay with the type of spark plug recommended by the vehicle manufacturer. We make it easy for you to select the plugs that meet or exceed your engine’s requirements. Just plug in your year, make, model, and engine size in the fields at the top of this page and you’ll instantly be shown a selection of spark plugs from the top brands, and each one will deliver the performance, fuel economy, and durability you’re looking for at an affordable price. Besides spark plugs, we offer spark plug tubes and seals for engines that require them, as well as tune-up kits for select vehicles that include plugs, distributor cap and rotor, plug wires, filters, and more. Performance spark plugs are an easy and inexpensive way to upgrade the ignition system on any engine. We offer the latest platinum tipped plugs from the top brands, with air gap and electrode features that will provide more complete combustion than ordinary plugs, with exceptional durability.