{"id":748,"date":"2021-10-06T18:45:31","date_gmt":"2021-10-06T18:45:31","guid":{"rendered":"http:\/\/localhost:10008\/?p=748"},"modified":"2024-03-15T15:22:36","modified_gmt":"2024-03-15T15:22:36","slug":"the-causes-of-white-smoke-from-a-diesel-and-what-to-look-for","status":"publish","type":"post","link":"https:\/\/learndiesels.com\/the-causes-of-white-smoke-from-a-diesel-and-what-to-look-for\/","title":{"rendered":"The 3 Types of Diesel Engine White Smoke To Watch For"},"content":{"rendered":"\n<p>So, you have some white smoke billowing out of your exhaust. What is the cause? Maybe you are like me and have to look it up every time. No shame here. The answer is quite simple, but the solution might not be. Let\u2019s look into this issue and figure out what\u2019s going on.<\/p>\n\n\n\n<p><em>What causes white smoke from a diesel engine?<\/em><\/p>\n\n\n\n<p><strong>White smoke from a diesel engine is caused by the temperature being too low in the combustion chamber<\/strong>. This can happen when either there is<strong> <\/strong>raw diesel fuel that passes through to the exhaust, engine coolant is entering the combustion chamber, or the piston or other components are worn, damaged, or not correctly installed. <\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img data-dominant-color=\"7f7e7f\" data-has-transparency=\"false\" style=\"--dominant-color: #7f7e7f;\" fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"531\" src=\"https:\/\/learndiesels.com\/wp-content\/uploads\/2023\/01\/Screen-Shot-2023-01-11-at-9.54.24-AM-1024x531.png\" alt=\"\" class=\"not-transparent wp-image-1264\" srcset=\"https:\/\/learndiesels.com\/wp-content\/uploads\/2023\/01\/Screen-Shot-2023-01-11-at-9.54.24-AM-1024x531.png 1024w, https:\/\/learndiesels.com\/wp-content\/uploads\/2023\/01\/Screen-Shot-2023-01-11-at-9.54.24-AM-300x156.png 300w, https:\/\/learndiesels.com\/wp-content\/uploads\/2023\/01\/Screen-Shot-2023-01-11-at-9.54.24-AM-768x398.png 768w, https:\/\/learndiesels.com\/wp-content\/uploads\/2023\/01\/Screen-Shot-2023-01-11-at-9.54.24-AM-1536x797.png 1536w, https:\/\/learndiesels.com\/wp-content\/uploads\/2023\/01\/Screen-Shot-2023-01-11-at-9.54.24-AM.png 1550w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>Now, let\u2019s look at three scenarios. What is wrong really depends on the&nbsp;<strong>\u201ctype\u201d<\/strong>&nbsp;of white smoke you have. Let\u2019s break down the different ways white smoke presents itself and where to go from there. Here is how to decode the signs your diesel engine is giving you.<\/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<div class=\"ast-oembed-container \" style=\"height: 100%;\"><iframe title=\"White smoke from a Diesel #Shorts\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/BC9rDgSMUe0?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><\/div>\n<\/div><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">1. White smoke on a cold start, and then it disappears as the engine warms up<\/h2>\n\n\n\n<p>This is very common. It will often happen at&nbsp;<a href=\"https:\/\/learndiesels.com\/the-complete-guide-to-starting-a-diesel-in-cold-weather\/\">startup in cold weather<\/a>&nbsp;with lower compression engines. As you start running the engine at idle (around 650 or 750 rpm), you will achieve a more effective compression ratio, and the smoke clears. White smoke has a lot to do with the temperature in the combustion chamber.<\/p>\n\n\n\n<p><strong><em>If the smoke is really just a puff, there is not much to worry about. Especially if it has been sitting, it could just be built-up condensation.<\/em><\/strong><\/p>\n\n\n\n<p>If it lasts a few minutes after the engine is started and there is a&nbsp;<strong>rich diesel smell,<\/strong>&nbsp;they may be some cause for concern. Some of the likely causes include,<\/p>\n\n\n\n<ul>\n<li>Faulty injectors &#8211; stuck open.<\/li>\n\n\n\n<li>Worn piston rings or cylinder glazing<\/li>\n\n\n\n<li>If equipped with glow plugs, could be faulty plugs or module.<\/li>\n<\/ul>\n\n\n\n<p>Remember, if you have an older engine with really low compression and bad timing or low injection pressure, you are more likely to have white smoke. I wrote an article about&nbsp;<a href=\"https:\/\/learndiesels.com\/10-signs-and-symptoms-of-a-worn-out-diesel-engine\/\">signs and symptoms of a worn-out diesel engine<\/a>&nbsp;and if you need some tools to fix these issues check out my&nbsp;<a href=\"https:\/\/learndiesels.com\/the-tool-guide-for-new-diesel-mechanics\/\">complete tool guide for diesel techs<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">2. A thick cloud of white smoke<\/h2>\n\n\n\n<p><strong>Red alert<\/strong> This is the danger zone. Water or coolant can cause white smoke from a diesel engine as well. This is a symptom of a bad problem. Your engine is getting coolant or water in the combustion chamber. This is caused by a compromised part of the engine that has the flow of coolant in it.<\/p>\n\n\n\n<p>If you know anything about compressing water, you know this is not going to end well. Spoiler &#8211; water does not compress. So, if you have this problem, be careful running it for any period of time. Once you are sure it\u2019s water or coolant, stop and fix it.<\/p>\n\n\n\n<p>This will be a steady stream of smoke after starting up. Usually, you will see the smoke will be a \u201cthick\u201d cloud (Like in the picture at the top of the page). It will also be noted by a <strong>sweet smell<\/strong>. Some likely causes include,<\/p>\n\n\n\n<ul>\n<li>Blown head gasket<\/li>\n\n\n\n<li>Cracked block or head<\/li>\n\n\n\n<li>Contaminated fuel &#8211;&nbsp;<a href=\"https:\/\/learndiesels.com\/storing-diesel-fuel\/\">See my article on how long fuel lasts<\/a><\/li>\n\n\n\n<li>leaking Oil cooler (Through most of the time, the oil passes into the coolant)<\/li>\n<\/ul>\n\n\n\n<p><strong>Remember, significant damage will occur if you run the engine with water in the combustion chamber.<\/strong>&nbsp;When you see this occurring your best bet is to be towed to a garage where the problem can be diagnosed and made.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">3. Continuous \u201clight\u201d white smoke<\/h2>\n\n\n\n<p>To run correctly, a diesel engine needs precise timing of the injector pump and proper pressure. Any decrease in the pressure or delay in delivering the fuel to the combustion chamber will cause incomplete combustion, and you will have white smoke.<\/p>\n\n\n\n<p>This is a steady stream of&nbsp;<em>lighter<\/em>&nbsp;white smoke. It can even be random but often \u201cpuff.\u201d Some likely causes include,<\/p>\n\n\n\n<ul>\n<li>A clogged fuel filter<\/li>\n\n\n\n<li>Low pressure in the fuel pump (Air in the fuel)<\/li>\n\n\n\n<li>Faulty or damaged injectors &#8211; <a href=\"https:\/\/learndiesels.com\/storing-diesel-fuel\/\">See my article on diesel injectors<\/a><\/li>\n\n\n\n<li>Incorrect injection timing (Worn timing gear or damaged crankshaft keyway).<\/li>\n\n\n\n<li>Low cylinder compression (caused by leaking or broken valves, piston ring sticking, cylinder ring wear, or cylinder glaze)<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><strong><em>Important note for modern diesel engines<\/em><\/strong><\/h2>\n\n\n\n<p><strong>Modern diesel engines are designed to deliberately over-fuel the engine (or just one cylinder) for brief periods to create heat to burn carbon off of the Diesel Particulate Filter or DPF. If this over-fueling operation is not operating properly, it can cause white smoke and damage to the engine.<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Summing up<\/h2>\n\n\n\n<p>White smoke can be difficult to diagnose but, if you follow the signs and look at the simple things first, you can get to your answer fairly quickly. As with any repair, be careful to think about what\u2019s going on before you act. The damages that can occur from the problems denoted by white smoke can be catastrophic, but you can likely avoid even more costly repairs if you can catch them early. Looking for a complete diesel smoke guide? If you want to understand more, go here -&gt;&nbsp;<a href=\"https:\/\/learndiesels.com\/diesel-smoke-guide\">Diesel Smoke Diagnosis Guide &#8211; White, Grey, Black, Blue<\/a>.<\/p>\n\n\n\n\n\n<h2 class=\"wp-block-heading\">Related Questions<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Can bad fuel cause white smoke?<\/h3>\n\n\n\n<p>Yes. If the&nbsp;<a href=\"https:\/\/learndiesels.com\/storing-diesel-fuel\">fuel is contaminated<\/a>&nbsp;with water or some other foreign material, it may produce white smoke. The best way to test the fuel is to pull the filter and empty the fuel from it into a clear glass or container. Wait a few minutes and see if there is any separation. The water will rise to the top and bubble up in the diesel.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Can air in fuel cause white smoke?<\/h3>\n\n\n\n<p>Air in fuel can cause white smoke. This is a common cause of white smoke. Check all the lines and injector supply lines to see if there is anything loose. Air can pass through any lost connections. Especially in today\u2019s high-pressure systems, you need to make sure that it\u2019s all tight and sealed.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Will a faulty diesel injector cause white smoke?<\/h3>\n\n\n\n<p>There are several ways that a faulty injector can lead to white smoke:<\/p>\n\n\n\n<ul>\n<li><strong>Leakage:<\/strong> If a diesel injector is leaking fuel into the combustion chamber, it can cause white smoke to be produced. The excess fuel is not fully combusted, leading to incomplete combustion and smoke.<\/li>\n\n\n\n<li><strong>Injection timing: <\/strong>If the injectors are not injecting fuel at the right time, it can cause poor combustion and white smoke.<\/li>\n\n\n\n<li><strong>Improper atomization: <\/strong>If the injectors are not properly atomizing the fuel, it can result in white smoke being produced. This can be caused by worn injectors or a clogged fuel filter.<\/li>\n\n\n\n<li><strong>Blockage: <\/strong>If the injectors are blocked, it can cause poor combustion and white smoke.<\/li>\n<\/ul>\n\n\n\n<p><\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"800\" height=\"2000\" src=\"http:\/\/143.198.54.80\/wp-content\/uploads\/2021\/10\/smokeinfo-1.jpg\" alt=\"\" class=\"wp-image-672\" title=\"smoke info\" srcset=\"https:\/\/learndiesels.com\/wp-content\/uploads\/2021\/10\/smokeinfo-1.jpg 800w, https:\/\/learndiesels.com\/wp-content\/uploads\/2021\/10\/smokeinfo-1-120x300.jpg 120w, https:\/\/learndiesels.com\/wp-content\/uploads\/2021\/10\/smokeinfo-1-410x1024.jpg 410w, https:\/\/learndiesels.com\/wp-content\/uploads\/2021\/10\/smokeinfo-1-768x1920.jpg 768w, https:\/\/learndiesels.com\/wp-content\/uploads\/2021\/10\/smokeinfo-1-614x1536.jpg 614w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/figure>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>So, you have some white smoke billowing out of your exhaust. What is the cause? Maybe you are like me [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":670,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"disabled","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""}},"footnotes":""},"categories":[39],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>The 3 Types of Diesel Engine White Smoke To Watch For - learn diesels<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/learndiesels.com\/the-causes-of-white-smoke-from-a-diesel-and-what-to-look-for\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"The 3 Types of Diesel Engine White Smoke To Watch For - learn diesels\" \/>\n<meta property=\"og:description\" content=\"So, you have some white smoke billowing out of your exhaust. What is the cause? Maybe you are like me [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/learndiesels.com\/the-causes-of-white-smoke-from-a-diesel-and-what-to-look-for\/\" \/>\n<meta property=\"og:site_name\" content=\"learn diesels\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/groups\/415908004259540\" \/>\n<meta property=\"article:published_time\" content=\"2021-10-06T18:45:31+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-03-15T15:22:36+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/learndiesels.com\/wp-content\/uploads\/2021\/10\/bus2-1.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1641\" \/>\n\t<meta property=\"og:image:height\" content=\"924\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"Johnathan Coker\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Johnathan Coker\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"6 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/learndiesels.com\/the-causes-of-white-smoke-from-a-diesel-and-what-to-look-for\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/learndiesels.com\/the-causes-of-white-smoke-from-a-diesel-and-what-to-look-for\/\"},\"author\":{\"name\":\"Johnathan Coker\",\"@id\":\"https:\/\/learndiesels.com\/#\/schema\/person\/e2c41f752d9a51991be13bfe86a70e89\"},\"headline\":\"The 3 Types of Diesel Engine White Smoke To Watch For\",\"datePublished\":\"2021-10-06T18:45:31+00:00\",\"dateModified\":\"2024-03-15T15:22:36+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/learndiesels.com\/the-causes-of-white-smoke-from-a-diesel-and-what-to-look-for\/\"},\"wordCount\":1173,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/learndiesels.com\/#organization\"},\"image\":{\"@id\":\"https:\/\/learndiesels.com\/the-causes-of-white-smoke-from-a-diesel-and-what-to-look-for\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/learndiesels.com\/wp-content\/uploads\/2021\/10\/bus2-1.png\",\"articleSection\":[\"Troubleshooting\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/learndiesels.com\/the-causes-of-white-smoke-from-a-diesel-and-what-to-look-for\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/learndiesels.com\/the-causes-of-white-smoke-from-a-diesel-and-what-to-look-for\/\",\"url\":\"https:\/\/learndiesels.com\/the-causes-of-white-smoke-from-a-diesel-and-what-to-look-for\/\",\"name\":\"The 3 Types of Diesel Engine White Smoke To Watch For - 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