When you turn the key in your vehicle’s ignition switch, it begins a long and complicated process that eventually results in your engine starting up. Along the process, there are a massive number of components required to work properly, and some components even rely on others to work, so many problems can be caused by even the simplest problems. One of the parts required in this process is the spark plug.

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    • (0 reviews)
      # sp17958
      U-Groove Header Spark Plug by Accel®. Designed utilizing the latest technology, this product by Accel features premium quality and will perform better than advertised. Perfect for your vehicle and lifestyle, it is manufactured to...
      Manufactured from premium materialsDesigned to provide years of reliable service
      $14.68 - $37.79
    • (1 review)
      # sp2752
      Spark Plug by E3®. For a more efficient and complete burn, go with the super sturdy plugs by E3. The advanced DiamondFire plug features a diamond-shaped electrode that ensures rapid and complete combustion, enabling power output...
      Advanced DiamondFire electrode designProduces a faster burn
      $5.99
    • (18 reviews)
      # sp4894
      PlasmaCore Series Inconel Electrode Pulse Plug by Pulstar®. PlasmaCore Series Inconel Electrode Pulse Plug provides great fuel efficiency as well as better performance. Moreover this part will give you better throttle response and...
      Increased horsepowerBetter torque
      $14.95 - $179.40
    • (1 review)
      # sp5797
      Platinum Plus 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, smoother...
      Delivers quick starts and smooth accelerationLower ignition voltage requirement provides reliable cold weather starting and superior operation under all driving conditions
      $4.70 - $7.39
    • (0 reviews)
      # sp22880
      U-Groove Spark Plug by Accel®. This spark plug has a 14mm thread size, 0.708" reach and a heat range of 6. Designed utilizing the latest technology, this product by Accel features premium quality and will perform better than...
      Manufactured from premium materialsDesigned to provide years of reliable service
      $12.58 - $16.78
    • (0 reviews)
      # sp5796
      Super Plus Spark Plug by Bosch®. Pack of 1. Bosch Super Plus delivers outstanding durability and reliability you want for your vehicle. Its tapered, v-profile ground electrode makes for better starting in cold weather and improved...
      Heavy-duty yttrium-enhanced copper core center electrode for a 50% longer performance life vs. even OE plugsTapered, v-profile nickel chromium ground electrode for improved starting in cold weather and increased fuel ignitability
      $2.50 - $9.30
    • (1 review)
      # sp5795
      Platinum Ir Fusion™ Spark Plug by Bosch®. Pack of 4. If you want the best for your engine, try Platinum Ir Fusion spark plugs. Their fused iridium and platinum center electrode with exclusive surface air gap firing technology...
      Fused iridium and platinum center electrode, sintered into an extended insulator nose reaches self-cleaning temperature only seconds after starting and provides exceptional wear resistanceTapered shape of the ground electrode reduces flame shrouding for improved combustion and more power
      $8.97 - $11.84
    • (1 review)
      # sp5794
      OE Fine Wire Spark Plug by Bosch®. Pack of 1. Bosch introduces the new OE Fine Wire Spark Plug family, which consists of Iridium, Double Platinum and Platinum plugs. Built around OE technology, these new lines have an original...
      OE specific design360-degree continuous laser welded platinum tip for durability and long life
      $3.40 - $18.21
    • (3 reviews)
      # sp3187
      Power Tune Spark Plug by ZEX™. When you add performance modifications like high-flow air filters, headers, performance exhaust, nitrous, or superchargers, you need stronger spark to maximize the horsepower available from these...
      Increased horsepowerBetter torque
      $7.11 - $52.08
    • (0 reviews)
      # sp12498
      Super Fire Racing Iridium Spark Plugs by HKS®. HKS Plug ignites faster and efficient for the best fuel efficiency and the best performance in all situation and environment. It’s very important to provide safe and stable ignition...
      0.6mm Iridium Alloy Center ElectrodeIridium Alloy Center Electrode reduces voltage requirement as well as improving ignition performance and durability
      $26.96 - $46.09
    • (3 reviews)
      # sp3185
      Hyperformance™ Spark Plug by ZEX™. These plugs have an optimal heat range and ground strap designed for nitrous, turbo and supercharged engines that maximize safety and performance. Durable nickel electrodes with copper core...
      Increased horsepowerBetter torque
      $7.11 - $52.08
    • (6 reviews)
      # sp13215
      Performance Spark Plug by Nitrode®. The Nitrode™ spark plugs is positioned to be the world's "greenest" most environmentally friendly spark plugs on the planet. Reducing fuel consumption and emissions while producing more power...
      The Nitrode™ is made with a proprietary ceramic exclusively used for this spark plugThis unique ceramic is over 10% harder than any ceramic know today
      $9.99
    • (0 reviews)
      # sp2885
      Super Tune-Up Kit by Accel®. Everything you need to Super Tune Up your truck, van, or Jeep engine! The kits includes a high performance cap and rotor. A set of 8mm Extreme 9000 Spiral Core wires. This kit also includes the ACCEL...
      The finest quality at a great priceImproves your engine's performance
      $60.90 - $157.95
    • (0 reviews)
      # sp32200
      Precision-Gapped Spark Plugs by Livernois Motorsports®. Highly recommended for any vehicle with a performance tune, Livernois Motorsports & Engineering's precision gapped Motocraft spark plugs eliminate hi boost flame-out misfires...
      Designed for excellent engine performanceManufactured to strict quality standards
      $97.99
    • (0 reviews)
      # sp26555
      Multi-Ground Spark Plug by NGK®. Designed utilizing the latest technology, this product by NGK 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
      $5.40 - $13.34
    • (0 reviews)
      # sp22878
      Ignition Tune Up Kit by Accel®. If you own a vehicle 15 years old or newer odds are it doesn’t have a distributor or, in some cases, ignition wires. In the old days the parts required for a tune-up consisted of points, condenser,...
      HP Copper Core Plugs – better at transferring energy than iridium or platinum plugsC-Cut ground electrode - better exposure to the flame kernel
      $75.62 - $143.95
    • (0 reviews)
      # sp22879
      Ignition Upgrade Kit by Accel®. If you own car or truck with a 2 or 3 valve modular engine and want to get the most out of your ignition system then look no further! ACCEL now offers NEW Ignition Upgrade Kits. Not only will you get...
      HP Copper Core Plugs – better at transferring energy than iridium or platinum plugsC-Cut ground electrode - better exposure to the flame kernel
      $222.95 - $359.95
    • (0 reviews)
      # sp92371
      Cold Spark Plug by Ford Performance®. For use in engines with higher than stock cylinder combustion pressures or sustained high rpm. Turn your Ford into a high-performance street and drag strip monster with top-of-the-line Ford...
      Designed to help you get the most out of your vehiclePerfect for use in high-performance environments
      $112.80 - $128.15
    • (0 reviews)
      # sp11988
      Engine Spark Plug Tube by Melling®. Melling provides spark plug tubes for both domestic and import vehicle applications. Each spark plug tube is manufactured from high quality material to assure the correct fit and function...
      Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle
      $9.36 - $14.56
    • (0 reviews)
      # mpn2276221431
      Tune Up Kit by Accel®. ACCEL now offers the cure for burnt spark plug wire boots with Extreme 9000 Ceramic Wire kits. The 8mm Ferro-Spiral core wire now has ceramic boots on the spark plug end of the wires. The ceramic boots will...
      500 Ohms/ft Of Resistance600 F Rated Silicone Jacket
      $123.95
    • (0 reviews)
      # mpn2276220322
      3 Valve Tune Up Kit by Accel®. If you own a vehicle 15 years old or newer odds are it doesn’t have a distributor or, in some cases, ignition wires. In the old days the parts required for a tune-up consisted of points, condenser,...
      HP Copper Core Plugs – better at transferring energy than iridium or platinum plugsC-Cut ground electrode - better exposure to the flame kernel
      $143.95
    • (0 reviews)
      # mpn2276220256
      2 Valve Tune Up Kit by Accel®. If you own a vehicle 15 years old or newer odds are it doesn’t have a distributor or, in some cases, ignition wires. In the old days the parts required for a tune-up consisted of points, condenser,...
      HP Copper Core Plugs – better at transferring energy than iridium or platinum plugsC-Cut ground electrode - better exposure to the flame kernel
      $75.62
    • (0 reviews)
      # mpn1588772548
      Spark Plug by Accel®. This spark plug has a 14mm thread size, 0.708" reach and a heat range of 6. Designed utilizing the latest technology, this product by Accel features premium quality and will perform better than advertised....
      Manufactured from premium materialsDesigned to provide years of reliable service
      $24.95
    • (0 reviews)
      # mpn1588768978
      Spark Plug by Accel®. Designed utilizing the latest technology, this product by Accel features premium quality and will perform better than advertised. Perfect for your vehicle and lifestyle, it is manufactured to meet or exceed...
      Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle
      $11.96
    • (0 reviews)
      # mpn1588772550
      Spark Plug by Accel®. Quantity: 8 Pcs. Designed utilizing the latest technology, this product by Accel features premium quality and will perform better than advertised. Perfect for your vehicle and lifestyle, it is manufactured to...
      Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle
      $92.95
    • (0 reviews)
      # mpn1588769070
      Spark Plug by Accel®. Designed utilizing the latest technology, this product by Accel features premium quality and will perform better than advertised. Perfect for your vehicle and lifestyle, it is manufactured to meet or exceed...
      Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle
      $11.28
    • (0 reviews)
      # mpn1588772549
      Spark Plug by Accel®. Quantity: 8 Pcs. Designed utilizing the latest technology, this product by Accel features premium quality and will perform better than advertised. Perfect for your vehicle and lifestyle, it is manufactured to...
      Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle
      $85.15
    • (0 reviews)
      # mpn2270585
      U-Groove Standard Header Spark Plugs (0276S-4) by Accel®. Quantity: 4 Pcs. Designed utilizing the latest technology, this product by Accel features premium quality and will perform better than advertised. Perfect for your vehicle...
      Manufactured from premium materialsDesigned to provide years of reliable service
      $19.93
    • (0 reviews)
      # mpn2270621
      U-Groove Header Spark Plug (8198) by Accel®. 2 of Part Number # 0574S-4. Quantity: 8 Pcs. Heat Range 5. Designed utilizing the latest technology, this product by Accel features premium quality and will perform better than...
      Manufactured from premium materialsDesigned to provide years of reliable service
      $37.79
    • (0 reviews)
      # mpn2276883
      U-Groove Header Spark Plug (8197) by Accel®. 2 of Part Number # 0437S-4. Quantity: 8 Pcs. Designed utilizing the latest technology, this product by Accel features premium quality and will perform better than advertised. Perfect for...
      Manufactured from premium materialsDesigned to provide years of reliable service
      $31.49
    • (0 reviews)
      # mpn2270588
      U-Groove Resistor Header Spark Plugs (0574S-4) by Accel®. Quantity: 4 Pcs. Heat Range: 5. Designed utilizing the latest technology, this product by Accel features premium quality and will perform better than advertised. Perfect for...
      Manufactured from premium materialsDesigned to provide years of reliable service
      $24.13
    • (0 reviews)
      # mpn2270587
      U-Groove Resistor Header Spark Plugs (0437S-4) by Accel®. Quantity: 4 Pcs. Designed utilizing the latest technology, this product by Accel features premium quality and will perform better than advertised. Perfect for your vehicle...
      Manufactured from premium materialsDesigned to provide years of reliable service
      $24.05
    • (0 reviews)
      # mpn2276837
      U-Groove Resistor Spark Plugs by Accel®. Quantity: 4 Pcs. This spark plug has a 14mm thread size, 0.708" reach and a heat range of 6. Designed utilizing the latest technology, this product by Accel features premium quality and will...
      Manufactured from premium materialsDesigned to provide years of reliable service
      $14.68
    • (0 reviews)
      # mpn2276834
      U-Groove Resistor Header Spark Plugs (0414S-4) by Accel®. Quantity: 4 Pcs. Designed utilizing the latest technology, this product by Accel features premium quality and will perform better than advertised. Perfect for your vehicle...
      Manufactured from premium materialsDesigned to provide years of reliable service
      $24.13
    • (0 reviews)
      # mpn2270633
      U-Groove Header Spark Plug (P526S) by Accel®. With Double Platinum Shorty. Designed utilizing the latest technology, this product by Accel features premium quality and will perform better than advertised. Perfect for your vehicle...
      Manufactured from premium materialsDesigned to provide years of reliable service
      $14.68
    • (0 reviews)
      # mpn2272642
      U-Groove Resistor Spark Plugs (0526-4) by Accel®. Quantity: 4 Pcs. This spark plug has a 14mm thread size, 0.708" reach and a heat range of 6. Designed utilizing the latest technology, this product by Accel features premium quality...
      Manufactured from premium materialsDesigned to provide years of reliable service
      $12.58
    • (0 reviews)
      # mpn2270622
      U-Groove Header Spark Plug (8199) by Accel®. 2 of Part Number # 0576S-4. Quantity: 8 Pcs. Heat Range 6. Designed utilizing the latest technology, this product by Accel features premium quality and will perform better than...
      Manufactured from premium materialsDesigned to provide years of reliable service
      $31.49
    • (0 reviews)
      # mpn2276835
      U-Groove Resistor Header Spark Plugs by Accel®. Quantity: 4 Pcs. Designed utilizing the latest technology, this product by Accel features premium quality and will perform better than advertised. Perfect for your vehicle and...
      Manufactured from premium materialsDesigned to provide years of reliable service
      $25.18
    • (0 reviews)
      # mpn2276836
      U-Groove Resistor Header Spark Plugs (0576S-4) by Accel®. Quantity: 4 Pcs. Heat Range: 6. Designed utilizing the latest technology, this product by Accel features premium quality and will perform better than advertised. Perfect for...
      Manufactured from premium materialsDesigned to provide years of reliable service
      $23.08
    • (0 reviews)
      # mpn2272646
      U-Groove Resistor Spark Plugs (0786-4) by Accel®. Quantity: 4 Pcs. This spark plug has a 14mm thread size, 0.708" reach and a heat range of 6. Designed utilizing the latest technology, this product by Accel features premium quality...
      Manufactured from premium materialsDesigned to provide years of reliable service
      $16.78
    • (0 reviews)
      # mpn2286126
      Super Tune-Up Kit (HST2) by Accel®. Include: Spark Plug Wire Set PN[7912Y], Distributor Cap, Rotor PN[11069], Ignition Coil PN[11076]. Everything you need to Super Tune Up your truck, van, or Jeep engine! The kit includes a high...
      The finest quality at a great priceImproves your engine's performance
      $105.95
    • (0 reviews)
      # mpn2286133
      Truck Super Tune-Up Kit (TST3) by Accel®. Include: Spark Plug Wire Set, Distributor Cap And Rotor, Spark Plugs. Everything you need to Super Tune Up your truck, van, or Jeep engine! The kit includes a high performance cap and...
      The finest quality at a great priceImproves your engine's performance
      $147.95
    • (0 reviews)
      # mpn2292270
      Truck Super Tune-Up Kit (TST6) by Accel®. Include: Spark Plug Wire Set, Distributor Cap And Rotor, Spark Plugs. Everything you need to Super Tune Up your truck, van, or Jeep engine! The kit includes a high performance cap and...
      The finest quality at a great priceImproves your engine's performance
      $157.95
    • (0 reviews)
      # mpn2286130
      Truck High Output Super Tune-Up Kit (TST17) by Accel®. Include: Spark Plug Wire Set, Distributor Cap And Rotor, Spark Plugs. Everything you need to Super Tune Up your truck, van, or Jeep engine! The kit includes a high performance...
      The finest quality at a great priceImproves your engine's performance
      $67.21
    • (0 reviews)
      # mpn2292268
      Truck Super Tune-Up Kit (TST4) by Accel®. Include: Spark Plug Wire Set, Distributor Cap And Rotor, Spark Plugs. Everything you need to Super Tune Up your truck, van, or Jeep engine! The kit includes a high performance cap and...
      The finest quality at a great priceImproves your engine's performance
      $126.95
    • (0 reviews)
      # mpn2292264
      Truck Super Tune-Up Kit (TST11) by Accel®. Include: Spark Plug Wire Set, Distributor Cap And Rotor, Spark Plugs. Everything you need to Super Tune Up your truck, van, or Jeep engine! The kit includes a high performance cap and...
      The finest quality at a great priceImproves your engine's performance
      $128.95
    • (0 reviews)
      # mpn2292263
      Truck Super Tune-Up Kit (TST10) by Accel®. Include: Spark Plug Wire Set, Distributor Cap And Rotor, Spark Plugs. Everything you need to Super Tune Up your truck, van, or Jeep engine! The kit includes a high performance cap and...
      The finest quality at a great priceImproves your engine's performance
      $125.95
    • (0 reviews)
      # mpn2292269
      Truck Super Tune-Up Kit (TST4HP) by Accel®. Include: Spark Plug Wire Set, Distributor Cap And Rotor, Spark Plugs, Shorty Header Spark Plugs. Everything you need to Super Tune Up your truck, van, or Jeep engine! The kit includes a...
      The finest quality at a great priceImproves your engine's performance
      $136.95
    • (0 reviews)
      # mpn2286127
      Truck Super Tune-Up Kit by Accel®. Include: Spark Plug Wire Set, Distributor Cap And Rotor, Spark Plugs. Everything you need to Super Tune Up your truck, van, or Jeep engine! The kit includes a high performance cap and rotor. A set...
      The finest quality at a great priceImproves your engine's performance
      $146.95
    • (0 reviews)
      # mpn2286129
      Truck High Output Super Tune-Up Kit (TST16) by Accel®. Include: Spark Plug Wire Set, Distributor Cap And Rotor, Spark Plugs. Everything you need to Super Tune Up your truck, van, or Jeep engine! The kit includes a high performance...
      The finest quality at a great priceImproves your engine's performance
      $60.90
    • (0 reviews)
      # mpn2286128
      Truck Super Tune-Up Kit by Accel®. Include: Spark Plug Wire Set, Distributor Cap And Rotor, Spark Plugs. Everything you need to Super Tune Up your truck, van, or Jeep engine! The kit includes a high performance cap and rotor. A set...
      The finest quality at a great priceImproves your engine's performance
      $132.95
    • (0 reviews)
      # mpn2292271
      Truck Super Tune-Up Kit (TST7) by Accel®. Include: Spark Plug Wire Set, Distributor Cap And Rotor, Spark Plugs. Everything you need to Super Tune Up your truck, van, or Jeep engine! The kit includes a high performance cap and...
      The finest quality at a great priceImproves your engine's performance
      $119.95
    • (0 reviews)
      # mpn2286132
      Truck Super Tune-Up Kit (TST24) by Accel®. Include: Spark Plug Wire Set, Distributor Cap And Rotor, Spark Plugs. Everything you need to Super Tune Up your truck, van, or Jeep engine! The kit includes a high performance cap and...
      The finest quality at a great priceImproves your engine's performance
      $122.95
    • (0 reviews)
      # mpn2286125
      Super Tune-Up Kit (HST1) by Accel®. Include: Spark Plug Wire Set PN[7913Y], Distributor Cap, Rotor PN[11069], Ignition Coil PN[11076]. Everything you need to Super Tune Up your truck, van, or Jeep engine! The kit includes a high...
      The finest quality at a great priceImproves your engine's performance
      $105.95
    • (0 reviews)
      # mpn1588772838
      Truck Super Tune-Up Kit (TST18) by Accel®. Include: Spark Plug Wire Set, Distributor Cap And Rotor, Spark Plugs. Everything you need to Super Tune Up your truck, van, or Jeep engine! The kit includes a high performance cap and...
      The finest quality at a great priceImproves your engine's performance
      $140.95
    • (0 reviews)
      # mpn2276220271
      3 Valve Ignition Upgrade Kit by Accel®. If you own car or truck with a 2 or 3 valve modular engine and want to get the most out of your ignition system then look no further! ACCEL now offers NEW Ignition Upgrade Kits. Not only will...
      HP Copper Core Plugs – better at transferring energy than iridium or platinum plugsC-Cut ground electrode - better exposure to the flame kernel
      $332.95
    • (0 reviews)
      # mpn2276220255
      2 Valve Ignition Upgrade Kit by Accel®. If you own car or truck with a 2 or 3 valve modular engine and want to get the most out of your ignition system then look no further! ACCEL now offers NEW Ignition Upgrade Kits. Not only will...
      HP Copper Core Plugs – better at transferring energy than iridium or platinum plugsC-Cut ground electrode - better exposure to the flame kernel
      $222.95
    • (0 reviews)
      # mpn2276220272
      3 Valve Ignition Upgrade Kit by Accel®. If you own car or truck with a 2 or 3 valve modular engine and want to get the most out of your ignition system then look no further! ACCEL now offers NEW Ignition Upgrade Kits. Not only will...
      HP Copper Core Plugs – better at transferring energy than iridium or platinum plugsC-Cut ground electrode - better exposure to the flame kernel
      $359.95
    • (0 reviews)
      # mpn1965291
      PlasmaCore Series Inconel Electrode Pulse Plug (BE1H10) by Pulstar®, 1 Piece, 19 mm Reach Length, 14 mm Thread Diameter, Inconel Electrode and Gasket Seat. Inconel-electrode Pulse Plug. Designed specifically for most popular...
      Increased horsepowerBetter torque
      $14.95
    • (0 reviews)
      # mpn1965299
      PlasmaCore Series Inconel Electrode Pulse Plug (AD1H10) by Pulstar®, 1 Piece, 18 mm Reach Length, 14 mm Thread Diameter, Inconel Electrode and Tapered Seat. Inconel-electrode Pulse Plug. Designed specifically for most popular...
      Increased horsepowerBetter torque
      $14.95




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    The process we spoke of earlier results in the fuel from your fuel tank being pumped into a cylinder, provided with an ignition source and then burnt until it becomes the power to turn the wheels. This ignition source is a spark and, as you might have guessed, this spark comes from one spark plug in each cylinder. When it is provided with power from the distributor or ignition coil, it will instantly spark and cause the cylinder to 'fire' at exactly the right time.

    The spark plug is a small component because it needs to be able to fit inside a relatively small cylinder. It is long, like a pencil, with a 'screw type' terminal at one end where it can be screwed in and fitted securely so it does not go anywhere under the serious vibrations of the engine. The filament at the other end is a simple component that turns electricity into a spark of flame, and this flame will ignite the fuel when it is pumped into the cylinder at exactly the same time.

    While it is a relatively simple component without the complexity of some others, there are still problems that can occur. Its biggest problem is time, and after a period, it will become damaged simply by wear and tear. The damage mostly occurs to the sparking filament, and will prevent it from being able to spark so the fuel cannot be burnt and power cannot be supplied. Other issues can happen with the spark plug wires, or the internals inside the spark plug, which can all be affected by the heat and vibrations.

    When one or more of these problems does occur, there are some symptoms to show you that you need to begin looking for more spark plugs. Symptoms include things like a rough idle, and it can begin to get rougher and rougher when it starts with one broken spark plug and ends with more than one. If the timing of the plug is out by the tiniest fraction, you can see something called 'pre-ignition,' which means the engine continues running after you turn the key to 'off,' or the engine simply will not start because no fuel can be burnt.

    To get your vehicle back on the road, or to avoid it being off the road in the first place, you need to find the right replacement component the first time you try. This is why CARiD has every part you need, for every vehicle, so you have the best possible chance of finding exactly what you need, without the stress and fuss you are used to. We understand how difficult it can be to decide, so we have spark plug reviews, which means you can decide which product is right for you by reading what other customers said when they purchased the same products you are currently looking at.

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    • Performance Engine Parts
      Performing a Basic Engine Tune Up
      This article will guide you through a generic tune up on most any car or light duty gasoline-powered vehicle built within the last 20 years or so. We will presume that you are tuning up your engine because it has reached the mileage or time point to do so, and that you are NOT performing a tune up to cure an engine performance defect. We make this distinction because not all running/performance issues will be solved via a simple tune up.
      July 03, 2014
    • Ignition Parts
      Understanding The Different Types Of Spark Plugs
      Since the dawn of the automobile, spark plugs have been an integral part of gasoline engines because they conduct the electrical energy from a vehicle’s ignition system needed to finalize the combustion process. After the gas/air mixture has been fully compressed inside the cylinder head, spark plugs serve a miniature bolt of lightning to create an explosion which pushes a piston downward.
      June 28, 2014

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    I have noticed an increase in power and fuel efficiency!
    CPosted by Carlton (Goose Creek, SC) / November 15, 2016
    2003 Infiniti G35
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