{"id":23026,"date":"2021-02-09T03:17:06","date_gmt":"2021-02-09T11:17:06","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=23026"},"modified":"2024-03-01T17:59:53","modified_gmt":"2024-03-02T01:59:53","slug":"glow-plug-vs-spark-plug-whats-the-difference","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/glow-plug-vs-spark-plug-whats-the-difference\/","title":{"rendered":"Glow Plug vs. Spark Plug: What\u2019s the Difference?"},"content":{"rendered":"<!DOCTYPE html PUBLIC \"-\/\/W3C\/\/DTD HTML 4.0 Transitional\/\/EN\" \"http:\/\/www.w3.org\/TR\/REC-html40\/loose.dtd\">\n<html><body><span class=\"span-reading-time rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">Reading Time: <\/span> <span class=\"rt-time\"> 4<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span><style>.kadence-column_9f1d78-e8 > .kt-inside-inner-col{border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column_9f1d78-e8 > .kt-inside-inner-col,.kadence-column_9f1d78-e8 > .kt-inside-inner-col:before{border-top-left-radius:0px;border-top-right-radius:0px;border-bottom-right-radius:0px;border-bottom-left-radius:0px;}.kadence-column_9f1d78-e8 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column_9f1d78-e8 > .kt-inside-inner-col{flex-direction:column;}.kadence-column_9f1d78-e8 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column_9f1d78-e8 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column_9f1d78-e8{position:relative;}@media all and (max-width: 1024px){.kadence-column_9f1d78-e8 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column_9f1d78-e8 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column inner-column-1 kadence-column_9f1d78-e8 qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-8cf589  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-bfd5a9\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading_30af10-4b, .wp-block-kadence-advancedheading.kt-adv-heading_30af10-4b[data-kb-block=\"kb-adv-heading_30af10-4b\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading_30af10-4b mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading_30af10-4b[data-kb-block=\"kb-adv-heading_30af10-4b\"] mark.kt-highlight{font-family:Inter;font-weight:500;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}.wp-block-kadence-advancedheading.kt-adv-heading_30af10-4b img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading_30af10-4b[data-kb-block=\"kb-adv-heading_30af10-4b\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading_30af10-4b summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading_30af10-4b\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\"><li>Glow plugs are used in diesel-powered internal combustion engines, and they are used to ignite the air-fuel mixture in the combustion chamber.<\/li><li>On the other hand, spark plugs are used in gas-powered internal combustion engines, and they are used to produce sparks that ignite the air-fuel mixture in the combustion chamber.<\/li><li>It&rsquo;s important to replace both glow plugs and spark plugs as soon as they start malfunctioning.<\/li><\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p>Knowing the difference between a spark plug and a glow plug can be tough if you&rsquo;re not familiar with basic auto parts. While you might think the two components are similar, in reality, they&rsquo;re entirely different. Spark plugs are used in gas-powered engines, whereas glow plugs are used in diesel applications. The two components also serve completely different purposes.<\/p>\n\n\n\n<p>To make the concept less confusing, let&rsquo;s take a closer look at the differences between spark plugs and glow plugs.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/02\/automotive-spark-plugs-1024x683.jpg\" alt=\"automotive spark plugs\" class=\"wp-image-23031\" width=\"1024\" height=\"683\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/02\/automotive-spark-plugs-1024x683.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/02\/automotive-spark-plugs-300x200.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/02\/automotive-spark-plugs-768x512.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/02\/automotive-spark-plugs-600x400.jpg 600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/02\/automotive-spark-plugs-150x100.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/02\/automotive-spark-plugs.jpg 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption>Spark plugs are used in gas-powered internal combustion engines.<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Spark Plugs<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">What Are Spark Plugs?<\/h3>\n\n\n\n<p>Spark plugs are used in gas-powered internal combustion engines. Typically, there&rsquo;s one spark plug for each of the engine&rsquo;s cylinders.<\/p>\n\n\n\n<p>Each spark plug has a metal body, ceramic insulator, internal resistor, and a pair of electrodes. A spark plug wire or ignition coil attaches to the terminal end of the spark plug. The other end of the plug protrudes into the engine&rsquo;s combustion chamber<\/p>\n\n\n\n<p>High-voltage from the car&rsquo;s ignition system travels to the terminal at each of the spark plugs. From there, the voltage goes through the spark plug&rsquo;s internal resistor before reaching the electrodes at the tip. The voltage then jumps a gap between the electrodes, creating an arc that ignites the engine&rsquo;s air-fuel mixture.<\/p>\n\n\n\n<p>The resulting explosion forces the piston downward in the cylinder, causing the engine&rsquo;s crankshaft to turn. As the crankshaft turns, it creates the rotational force needed to propel your vehicle down the road.<\/p>\n\n\n\n<p>You can learn more by watching this video on spark plug operation:<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"How Spark Plugs Work (Animation)\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/r1Tuh9wUP0g?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">How Often to Replace Spark Plugs<\/h3>\n\n\n\n<p>There are three primary types of spark plugs&mdash;copper, platinum, and iridium&mdash;each of which has a different life expectancy.<\/p>\n\n\n\n<p>Copper plugs have a copper center electrode covered in nickel alloy. The design typically lasts around 30,000 miles.<\/p>\n\n\n\n<div id=\"article-search-widget\">\n<div class=\"cp-search\">\n<div align=\"center\">\n<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/w_auto,dpr_auto\/carparts\/logos\/badge_wordmark\/full_color\/CP_LOGO_COLOUR_RGB\" alt=\"CarParts.com\" width=\"300\" height=\"56\">\n<\/div>\n<form id=\"cpsearchform\" name=\"cpsearchform\" action=\"https:\/\/www.carparts.com\/search\" method=\"get\" target=\"_blank\" accept-charset=\"character_set\" aria-label=\"search CarParts.com\">\n    <input type=\"text\" class=\"keyword\" name=\"q\" placeholder=\"Search for parts on CarParts.com\" value=\"\" aria-label=\"Search CarParts.com\"><input type=\"submit\" class=\"btn-search\" value=\"Search\" aria-label=\"Search\">\n<\/form>\n<\/div>\n<\/div>\n\n\n\n<p>Platinum plugs have a platinum disk attached to the tip of their center electrode. There are also so-called double platinum plugs that have platinum at both tips. Because platinum is more durable than nickel alloy, platinum plugs last longer than copper plugs. You can expect to replace a set of platinum plugs every 90,000 to 100,000 miles.<\/p>\n\n\n\n<p>Iridium plugs, which have a fine electrode made of iridium, are becoming increasingly popular. Because iridium is harder than platinum, it lasts longer, making this type of plug good for up to 120,000 miles.<\/p>\n\n\n\n<p>To determine when your plugs should be replaced, you&rsquo;ll want to consult the vehicle manufacturer&rsquo;s maintenance schedule. You can find this information in the owner&rsquo;s manual or supplemental service booklet.<\/p>\n\n\n\n<p>Check out our article on <a href=\"https:\/\/www.carparts.com\/blog\/how-to-change-spark-plugs\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"how to change spark plugs\">how to change spark plugs<\/a> for an idea of what the job typically entails.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/01\/glow-plugs-1024x683.jpg\" alt=\"glow plugs\" class=\"wp-image-22094\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/01\/glow-plugs-1024x683.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/01\/glow-plugs-300x200.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/01\/glow-plugs-768x512.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/01\/glow-plugs-600x400.jpg 600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/01\/glow-plugs-150x100.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/01\/glow-plugs.jpg 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption>glow plugs<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Glow Plugs<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">What is a Glow Plug?<\/h3>\n\n\n\n<p>Glow plugs are used in diesel-powered internal combustion engines. While spark plugs ignite the engine&rsquo;s air-fuel mixture whenever the vehicle is running, glow plugs act as a starting aid to get the engine going.<\/p>\n\n\n\n<p>Diesel engines rely on the heat from the compression of air to ignite fuel, making them difficult to start when cold. Many diesel-powered vehicles use glow plugs to address this issue. The glow plugs act as heating elements to preheat the air in the combustion chambers, making the vehicle easier to start. Diesel engines typically have one glow plug per cylinder.<\/p>\n\n\n\n<p>Each glow plug has a terminal, a threaded body, and a tip the protrudes into the engine&rsquo;s combustion chamber. Applying voltage to the terminal end of the plug allows electrical current to pass through a heating element in the plug&rsquo;s tip. The plug&rsquo;s body, which is threaded into the cylinder head, acts as an electrical ground for the heating element.<\/p>\n\n\n\n<p>You can learn more by watching this video on glow plug operation:<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"Glow Plug Operation Training Module Trailer\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/Sk-hm-LHY7s?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">How Often To Replace Glow Plugs<\/h3>\n\n\n\n<p>Unlike spark plugs, glow plugs do not have a recommended service schedule. Glow plugs only require replacement when they fail or wear out.<\/p>\n\n\n\n<p>If you need to determine whether your vehicle&rsquo;s glow plugs require replacement, check out our article: <a href=\"https:\/\/www.carparts.com\/blog\/how-to-test-glow-plugs-the-right-way\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"How to Test Glow Plugs The Right Way: A Step-by-Step Guide\">How to Test Glow Plugs The Right Way: A Step-by-Step Guide<\/a>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Where to Get Ignition Parts for Your Ride<\/h2>\n\n\n\n<p>Looking to replace ignition parts on your vehicle? Look no further than <a href=\"http:\/\/carparts.com\" target=\"_blank\" rel=\"noreferrer noopener nofollow\" aria-label=\"CarParts.com\">CarParts.com<\/a>. Whether you need new spark plugs, glow plugs, or any other ignition components, we&rsquo;ve got you covered.<\/p>\n\n\n\n<p>We carry a wide selection of <a href=\"https:\/\/www.carparts.com\/electronic-control-modules-ignition-and-distributors\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"ignition system parts\">ignition system parts<\/a> for various makes and models of vehicles. Our comprehensive inventory includes aftermarket ignition parts from trusted brands, ensuring compatibility and reliability.<\/p>\n\n\n\n<p>To get started, simply input your vehicle&rsquo;s details into our search tool, and we&rsquo;ll present you with a tailored selection of ignition system components. What&rsquo;s more, we have distribution centers located across the country to ensure fast and efficient shipping.<\/p>\n\n\n\n<p>Don&rsquo;t let ignition issues leave you stranded. Explore our selection of high-quality parts today and keep your ride running smoothly!<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Products Mentioned in this Guide<\/h2>\n\n\n\n<div class=\"reusable-productlink\">\n\n<!-- start of editable content -->\n\n<a href=\"https:\/\/www.carparts.com\/spark-plug\" target=\"_blank\" aria-label=\"Spark Plug\" rel=\"noopener\">\n<img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/d_noimage.jpg,h_200,w_200,c_pad,f_auto,q_auto,dpr_auto,e_sharpen\/images\/np06k905601m_1\" alt=\"Spark Plug\">\n<strong>Spark Plug<\/strong>\n<\/a>\n\n<a href=\"https:\/\/www.carparts.com\/glow-plug\" target=\"_blank\" aria-label=\"Glow Plug\" rel=\"noopener\">\n<img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/d_noimage.jpg,h_200,w_200,c_pad,f_auto,q_auto,dpr_auto,e_sharpen\/images\/repv313601_1\" alt=\"Glow Plug\">\n<strong>Glow Plug<\/strong>\n<\/a>\n\n<!-- end of editable content -->\n<\/div>\n<\/body><\/html>\n","protected":false},"excerpt":{"rendered":"<p><span class=\"span-reading-time rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">Reading Time: <\/span> <span class=\"rt-time\"> 4<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span>Knowing the difference between a spark plug and a glow plug can be tough if you&rsquo;re not familiar with basic&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/glow-plug-vs-spark-plug-whats-the-difference\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":29,"featured_media":23033,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_genesis_hide_title":false,"_genesis_hide_breadcrumbs":false,"_genesis_hide_singular_image":false,"_genesis_hide_footer_widgets":false,"_genesis_custom_body_class":"","_genesis_custom_post_class":"","_genesis_layout":"","footnotes":""},"categories":[52,3744],"tags":[2714,1171],"ppma_author":[2622],"class_list":{"0":"post-23026","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-diy","8":"category-ignition-system","9":"tag-glow-plug","10":"tag-spark-plug-2","11":"entry"},"acf":{"adrotate_specific_mobile_ad":"","adrotate_specific_desktop_ad":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Glow Plug vs. Spark Plug: What\u2019s the Difference? - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"Confused about glow plugs and spark plugs? Here&#039;s a closer look at the differences between these two basic car parts. Read more.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.carparts.com\/blog\/glow-plug-vs-spark-plug-whats-the-difference\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Glow Plug vs. Spark Plug: What\u2019s the Difference? - In The Garage with CarParts.com\" \/>\n<meta property=\"og:description\" content=\"Confused about glow plugs and spark plugs? Here&#039;s a closer look at the differences between these two basic car parts. Read more.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.carparts.com\/blog\/glow-plug-vs-spark-plug-whats-the-difference\/\" \/>\n<meta property=\"og:site_name\" content=\"In The Garage with CarParts.com\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/carpartscom\" \/>\n<meta property=\"article:published_time\" content=\"2021-02-09T11:17:06+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-03-02T01:59:53+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/02\/glow-plugs.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1500\" \/>\n\t<meta property=\"og:image:height\" content=\"1000\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@carpartscom\" \/>\n<meta name=\"twitter:site\" content=\"@carpartscom\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"5 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/glow-plug-vs-spark-plug-whats-the-difference\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/glow-plug-vs-spark-plug-whats-the-difference\\\/\"},\"author\":[{\"@type\":\"Person\",\"$id\":\"29\",\"name\":\"Mia Bevacqua\",\"jobTitle\":\"ASE Master Automobile Technician\",\"description\":\"Mia Bevacqua has over 14 years of experience in the auto industry and holds a bachelor\u2019s degree in Advanced Automotive Systems. 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