{"id":22089,"date":"2021-01-25T22:28:01","date_gmt":"2021-01-26T06:28:01","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=22089"},"modified":"2024-03-23T02:09:41","modified_gmt":"2024-03-23T09:09:41","slug":"how-to-test-glow-plugs-the-right-way-a-step-by-step-guide","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/how-to-test-glow-plugs-the-right-way-a-step-by-step-guide\/","title":{"rendered":"How to Test Glow Plugs The Right Way: A Step-by-Step Guide"},"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\"> 5<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span><style>.kadence-column_a7e7e8-00 > .kt-inside-inner-col{border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column_a7e7e8-00 > .kt-inside-inner-col,.kadence-column_a7e7e8-00 > .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_a7e7e8-00 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column_a7e7e8-00 > .kt-inside-inner-col{flex-direction:column;}.kadence-column_a7e7e8-00 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column_a7e7e8-00 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column_a7e7e8-00{position:relative;}@media all and (max-width: 1024px){.kadence-column_a7e7e8-00 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column_a7e7e8-00 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column inner-column-1 kadence-column_a7e7e8-00 qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-602957  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-582f57\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading_6bd9eb-f8, .wp-block-kadence-advancedheading.kt-adv-heading_6bd9eb-f8[data-kb-block=\"kb-adv-heading_6bd9eb-f8\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading_6bd9eb-f8 mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading_6bd9eb-f8[data-kb-block=\"kb-adv-heading_6bd9eb-f8\"] 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_6bd9eb-f8 img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading_6bd9eb-f8[data-kb-block=\"kb-adv-heading_6bd9eb-f8\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading_6bd9eb-f8 summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading_6bd9eb-f8\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\"><li>Glow plugs are designed to preheat the air in the combustion chambers, making diesel vehicles easier to start.<\/li><li>Testing glow plugs involves doing a preliminary visual inspection, using an infrared thermometer to test them, and then using a multimeter to check their resistance.<\/li><li>Keep in mind that a glow plug can become faulty because of excessive carbon buildup. You might want to remove any suspect plugs to check for this issue.<\/li><\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p>Is your diesel-powered vehicle difficult to start when cold? If so, there may be a problem with the glow plugs.<\/p>\n\n\n\n<p>Of course, because many different issues can cause hard starting, you&rsquo;ll need to do some troubleshooting to determine whether the glow plugs are to blame. The good news is, you can perform a simple glow plug resistance test at home with a digital multimeter (DMM).<\/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\/01\/automotive-glow-plugs-1024x683.jpg\" alt=\"automotive glow plugs\" class=\"wp-image-22095\" width=\"1024\" height=\"683\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/01\/automotive-glow-plugs-1024x683.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/01\/automotive-glow-plugs-300x200.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/01\/automotive-glow-plugs-768x512.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/01\/automotive-glow-plugs-600x400.jpg 600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/01\/automotive-glow-plugs-150x100.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/01\/automotive-glow-plugs.jpg 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption>The glow plugs act as heating elements to preheat the air in the combustion chambers, making the vehicle easier to start.<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">What is a Glow Plug?<\/h2>\n\n\n\n<p>Gas-powered engines use spark plugs to ignite the air-fuel mixture inside the combustion chambers. On the other hand, Diesel engines rely on the heat from the compression of air to ignite fuel. Because of this, diesel engines can be difficult to start when cold.<\/p>\n\n\n\n<p>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>Modern vehicles have a control module that manages the glow plugs. The module looks at inputs from various sensors, such as the coolant temperature and oil temperature sensors, when determining when to turn on the glow plugs. On many vehicles, the control module activates the glow plugs via a relay.<\/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<h2 class=\"wp-block-heading\">How to Test Glow Plugs in an Engine<\/h2>\n\n\n\n<p>Over time, glow plugs wear out, and their internal resistance changes. When this happens, the plugs may cause hard starting and other issues. Fortunately, testing the glow plugs to see if they require replacement is a fairly straightforward affair.<\/p>\n\n\n\n<p><em><strong>Note:<\/strong> The following are general guidelines for educational and entertainment purposes only. Consult your vehicle&rsquo;s factory information for specific repair instructions and recommended safety procedures.<\/em><\/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\/01\/mechanic-checking-DTC-1024x683.jpg\" alt=\"mechanic checking DTC\" class=\"wp-image-22101\" width=\"1024\" height=\"683\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/01\/mechanic-checking-DTC-1024x683.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/01\/mechanic-checking-DTC-300x200.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/01\/mechanic-checking-DTC-768x512.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/01\/mechanic-checking-DTC-600x400.jpg 600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/01\/mechanic-checking-DTC-150x100.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/01\/mechanic-checking-DTC.jpg 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption>When the device detects a problem with one or more of the glow plug circuits, it will turn on the check engine light and store a diagnostic trouble code in its memory.<\/figcaption><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Perform a Preliminary Inspection<\/h3>\n\n\n\n<p>If you&rsquo;re diagnosing the glow plug system on a modern vehicle and the check engine light is on, the first thing you&rsquo;ll want to do is check for diagnostic trouble codes (DTCs). A control module monitors the glow plug system. When the device detects a problem with one or more of the glow plug circuits, it will turn on the check engine light and store a diagnostic trouble code in its memory.<\/p>\n\n\n\n<p><em><strong>Note:<\/strong> If you have a scanner with OEM enhanced data, there is also a &ldquo;key on engine running (KOER)&rdquo; glow plug test you can perform on select Ford vehicles.<\/em><\/p>\n\n\n\n<p>Next, you&rsquo;ll want to perform a visual inspection of the glow plugs. Look for issues, such as damaged wires and poor connections. Make sure that the electrical connectors going to the glow plugs are clean and tight.<\/p>\n\n\n\n<p>Repair any issues found during the visual inspection, clear the DTCs, and see whether the problem returns.<\/p>\n\n\n\n<p>From there, you can move on to testing the glow plugs as necessary.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Test the Glow Plugs with an Infrared Thermometer<\/h3>\n\n\n\n<p>Before you whip out your digital multimeter, you might want to use an infrared thermometer to check for inoperative glow plugs. To do this, first, make sure the engine is cold. Then, cycle the ignition a few times to heat up the glow plugs, and point the thermometer at each plug.<\/p>\n\n\n\n<p>If you find a plug that has a much lower temperature than the others, that plug isn&rsquo;t working properly, either due to an internal failure or a damaged electrical connector.<\/p>\n\n\n\n<p><em><strong>Note: <\/strong>This test is only used to locate plugs that aren&rsquo;t working at all. A glow plug may pass this test and still have carbon buildup or be out of specification resistance-wise.<\/em><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">How to Test Glow Plugs with a Multimeter<\/h3>\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\/01\/glow-plug-module-1024x654.jpg\" alt=\"glow plug module\" class=\"wp-image-22091\" width=\"1024\" height=\"654\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/01\/glow-plug-module-1024x654.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/01\/glow-plug-module-300x192.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/01\/glow-plug-module-768x490.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/01\/glow-plug-module-150x96.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/01\/glow-plug-module.jpg 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption>You can test the resistance of the glow plugs with a digital multimeter (DMM)<\/figcaption><\/figure>\n\n\n\n<p>As was mentioned, the internal resistance of the glow plugs changes as the plugs begin to degrade. You can test the resistance of the plugs with a digital multimeter (DMM).<\/p>\n\n\n\n<p>The process for testing glow plugs may vary depending on the type of vehicle you have. For example, if the plugs are difficult to access, you may want to check the resistance at the wiring harness rather than at the plugs themselves. It&rsquo;s a good idea to consult a repair manual or repair database for the proper test procedure.<\/p>\n\n\n\n<p>In general, however, you can test the resistance of a glow plug by doing the following:<\/p>\n\n\n\n<ol class=\"wp-block-list\"><li>Make sure the vehicle&rsquo;s ignition is in the OFF position.<\/li><li>Disconnect the electrical connector from one of the glow plugs.<\/li><li>Set your digital multimeter (DMM) to the ohms setting.<\/li><li>Connect the red meter lead to the glow plug&rsquo;s terminal.<\/li><li>Connect the black meter lead to a good ground, such as the engine block.<\/li><li>Note the resistance reading on your meter. If the meter reads out of limits (OL), that indicates an open circuit and a faulty glow plug. Likewise, if one glow plug has a significantly different internal resistance than the others, that plug is likely faulty and should be replaced.<br><br>When in doubt, consult a <a href=\"https:\/\/www.carparts.com\/blog\/why-you-should-always-consult-a-repair-manual\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"repair manual or repair database\">repair manual or repair database<\/a> for the vehicle manufacturer&rsquo;s resistance specifications.<\/li><\/ol>\n\n\n\n<p>Keep in mind that a glow plug can be in good shape electrically and still have excessive carbon buildup. You may want to remove any suspect plugs to check for such a condition.<\/p>\n\n\n\n<p>If you find one or more of your vehicle&rsquo;s glow plugs to be faulty, check out our extensive selection of direct replacements.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Where to Get Glow Plugs for Your Vehicle<\/h2>\n\n\n\n<p>Like any other car parts, glow plugs are susceptible to wear and tear, usually due to carbon buildup, excessive heat, and general damage. If your glow plugs start to fail, don&rsquo;t think twice about replacing them.<\/p>\n\n\n\n<p>For top-notch glow plugs, look no further than <a href=\"http:\/\/carparts.com\" target=\"_blank\" rel=\"noreferrer noopener nofollow\" aria-label=\"CarParts.com\">CarParts.com<\/a>. We source all of our auto parts from the most trusted names in the industry, each carefully vetted by a team of professionals to guarantee both quality and longevity. That means you won&rsquo;t have to worry about your new glow plugs failing any time soon.<\/p>\n\n\n\n<p>You won&rsquo;t even have to take one step outside your door to get your hands on some new glow plugs. To start shopping, use your mobile device or computer to visit our website. Input all of your vehicle&rsquo;s details into the selection tool and use the search filters to find the glow plugs you need.<\/p>\n\n\n\n<p>All our glow plugs come with a low-price and lifetime replacement guarantee, helping you get the best value for your money. On top of that, our warehouses are strategically located all over the US. This means you can expect to receive any of your orders within a few days.&nbsp;<br>Check out our catalog and shop for new <a href=\"https:\/\/www.carparts.com\/glow-plug\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"glow plugs\">glow plugs<\/a> today!<\/p>\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\"> 5<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span>Is your diesel-powered vehicle difficult to start when cold? If so, there may be a problem with the glow plugs&#8230;. <a href=\"https:\/\/www.carparts.com\/blog\/how-to-test-glow-plugs-the-right-way-a-step-by-step-guide\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":29,"featured_media":22094,"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],"ppma_author":[2622],"class_list":{"0":"post-22089","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":"entry"},"acf":{"adrotate_specific_mobile_ad":"","adrotate_specific_desktop_ad":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How to Test Glow Plugs The Right Way: A Step-by-Step Guide - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"Having trouble starting your diesel-powered vehicle when it&#039;s cold? There may be a problem with the glow plugs. Read on for more info.\" \/>\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\/how-to-test-glow-plugs-the-right-way-a-step-by-step-guide\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to Test Glow Plugs The Right Way: A Step-by-Step Guide - In The Garage with CarParts.com\" \/>\n<meta property=\"og:description\" content=\"Having trouble starting your diesel-powered vehicle when it&#039;s cold? There may be a problem with the glow plugs. 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