{"id":41964,"date":"2021-07-20T03:07:04","date_gmt":"2021-07-20T10:07:04","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=41964"},"modified":"2024-02-02T06:44:31","modified_gmt":"2024-02-02T14:44:31","slug":"burnt-valve-symptoms-causes-replacement-cost-faq","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/burnt-valve-symptoms-causes-replacement-cost-faq\/","title":{"rendered":"Burnt Valve: Symptoms, Causes, Replacement Cost, &#038; FAQ"},"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_4a1c77-b4 > .kt-inside-inner-col{border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column_4a1c77-b4 > .kt-inside-inner-col,.kadence-column_4a1c77-b4 > .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_4a1c77-b4 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column_4a1c77-b4 > .kt-inside-inner-col{flex-direction:column;}.kadence-column_4a1c77-b4 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column_4a1c77-b4 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column_4a1c77-b4{position:relative;}@media all and (max-width: 1024px){.kadence-column_4a1c77-b4 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column_4a1c77-b4 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column inner-column-1 kadence-column_4a1c77-b4 qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-45ed7c  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-f4d36e\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading_e5163b-6b, .wp-block-kadence-advancedheading.kt-adv-heading_e5163b-6b[data-kb-block=\"kb-adv-heading_e5163b-6b\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading_e5163b-6b mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading_e5163b-6b[data-kb-block=\"kb-adv-heading_e5163b-6b\"] 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_e5163b-6b img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading_e5163b-6b[data-kb-block=\"kb-adv-heading_e5163b-6b\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading_e5163b-6b summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading_e5163b-6b\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\"><li>There are many intake and exhaust valves in your engine. If a valve is damaged by excessive temperatures, it can burn, which can lead to a loss of compression and an improperly sealed cylinder.<\/li><li>Causes of a burnt valve include the valve not seating properly or sticking open, high operating temperatures, and engine performance problems.<\/li><li>The symptoms of a burnt valve are rough running and misfiring and an illuminated check engine light.<\/li><\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p>Your car&rsquo;s engine contains a collection of valves working together to let air into the cylinders and exhaust gases out. When one of the valves runs too hot, it can become burnt, resulting in inadequate sealing of the cylinder and a <a href=\"https:\/\/www.carparts.com\/blog\/the-symptoms-of-low-compression-plus-faq\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"loss of compression\">loss of compression<\/a>.<\/p>\n\n\n\n<p>If the engine suffers from a burnt valve, you&rsquo;ll likely notice one or more troublesome symptoms that you&rsquo;ll want to address right away.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What is a Burnt Valve?<\/h2>\n\n\n\n<p>An internal combustion engine has one or more <a href=\"https:\/\/www.carparts.com\/camshaft\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"camshafts\">camshafts<\/a> that open and close a series of valves. The valves are located in the engine&rsquo;s cylinder head(s) and held in position by guides.&nbsp; Each of the cylinders typically has two to four valves, depending on the <a href=\"https:\/\/www.carparts.com\/blog\/car-engine-parts\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"engine&rsquo;s design\">engine&rsquo;s design<\/a>.<\/p>\n\n\n\n<p>There are two types of valves: intake and exhaust. Intake valves allow air (and fuel, in the case of port injection) into the engine&rsquo;s cylinders, whereas exhaust valves allow exhaust gases to exit.<\/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\/07\/cylinder-block-of-the-four-cylinder-engine-1024x682.jpg\" alt=\"cylinder block of the four cylinder engine\" class=\"wp-image-41974\" width=\"1024\" height=\"682\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/07\/cylinder-block-of-the-four-cylinder-engine-1024x682.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/07\/cylinder-block-of-the-four-cylinder-engine-300x200.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/07\/cylinder-block-of-the-four-cylinder-engine-768x512.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/07\/cylinder-block-of-the-four-cylinder-engine-1536x1024.jpg 1536w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/07\/cylinder-block-of-the-four-cylinder-engine-600x400.jpg 600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/07\/cylinder-block-of-the-four-cylinder-engine-150x100.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/07\/cylinder-block-of-the-four-cylinder-engine.jpg 1700w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption>Your car&rsquo;s engine contains a collection of valves working together to let air into the cylinders and exhaust gases out.<\/figcaption><\/figure>\n\n\n\n<p>Simply put, a burnt valve is a valve that has been damaged by excessive temperatures. The extreme heat will often cause the edges of the valve to burn away. In some cases, the valve may experience thermal shock, causing a portion of the valve to crack or break off. In any of these scenarios, the cylinder with the burnt valve will experience a loss of compression.<\/p>\n\n\n\n<p>The exhaust valves are constantly subjected to extremely hot exhaust gases. Also, unlike the intake valves, the exhaust valves don&rsquo;t benefit from cool air entering the engine. For these reasons, the exhaust valves run hotter and are more likely to burn than the intake valves.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Causes a Burnt Valve?<\/h2>\n\n\n\n<p>Any issue that creates excessive heat in a valve or <a href=\"https:\/\/www.carparts.com\/cylinder-head\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"cylinder head\">cylinder head<\/a> can cause a valve to burn. Some of the most common causes of a burnt valve include:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Valve Not Seating Properly or Sticking Open<\/h3>\n\n\n\n<p>When a valve sticks open or does not seat properly in the cylinder head, hot gases can sneak past the valve, causing it to burn. Common causes of improper valve seating include incorrect lash adjustment, valve and seat wear, improper machine work, and valve seat erosion. Weak valve springs, carbon deposit build-up, and improper valve stem-to-guide clearance can also cause the valve to stick open, preventing it from seating properly.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">High Operating Temperatures<\/h3>\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\/07\/shutterstock_1216001815-1024x683.jpg\" alt=\"shutterstock 1216001815\" class=\"wp-image-41997\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/07\/shutterstock_1216001815-1024x683.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/07\/shutterstock_1216001815-300x200.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/07\/shutterstock_1216001815-768x512.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/07\/shutterstock_1216001815-1536x1024.jpg 1536w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/07\/shutterstock_1216001815-scaled.jpg 2048w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/07\/shutterstock_1216001815-600x400.jpg 600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/07\/shutterstock_1216001815-150x100.jpg 150w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption>Extreme operating temperatures can lead to burnt valves.<\/figcaption><\/figure>\n\n\n\n<p>Extreme operating temperatures can lead to burnt valves. For example, cooling system problems, such as a low coolant level or defective water pump, can cause the engine to run hotter than normal, resulting in burnt valves. Localized high-temperature concerns (e.g., blocked coolant passages or a corroded head gasket) can have the same effect.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Engine performance problems<\/h3>\n\n\n\n<p>Burnt valves can also result from any type of engine performance problem that causes an increase in combustion temperatures. For instance, burnt valves can stem from detonation, a lean air-fuel mixture, or pre-ignition.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Burnt Exhaust Valve Symptoms<\/h2>\n\n\n\n<p>Do you think you might be dealing with a burnt valve? If your vehicle is exhibiting one or more of the following symptoms, you might be right.<\/p>\n\n\n\n<p><strong>Note: <\/strong>Because other problems can present the same symptoms as a burnt valve, you&rsquo;ll want to perform a thorough diagnosis of the vehicle before performing any repairs.<\/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<h3 class=\"wp-block-heading\">Rough Running and Misfiring<\/h3>\n\n\n\n<p>A gasoline internal combustion engine needs three primary ingredients to run well: a precise air-fuel mixture, proper spark, and adequate compression. If a cylinder has a burnt valve, that cylinder won&rsquo;t seal properly, leading to a loss of compression. The engine will begin to misfire and run rough as a result.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Illuminated Check Engine Light<\/h3>\n\n\n\n<p>Your car&rsquo;s engine computer, which is often referred to as the powertrain control module, looks for problems, such as a misfire caused by an exhaust valve leak, that could lead to an increase in vehicle emissions. If the module detects such a problem, it turns on the <a href=\"https:\/\/www.carparts.com\/blog\/check-engine-light-flashing\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"check engine light\">check engine light<\/a> and stores a corresponding <a href=\"https:\/\/www.carparts.com\/blog\/search-obd2-codes-list\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"diagnostic trouble code\">diagnostic trouble code<\/a> (DTC) in its memory.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How Much Does it Cost to Fix a Burnt Valve?<\/h2>\n\n\n\n<p>Replacing a burnt valve (or the entire cylinder head) is a costly and labor-intensive repair. If you choose to have a professional do the job, you can usually expect to pay somewhere <strong>between $1,000 and $2,500<\/strong> to get the job done. Of course, the exact cost will depend on various factors, such as the year, make, and model of your vehicle.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Burnt Valve FAQ<\/h2>\n\n\n\n<div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-question-1653621030402\"><strong class=\"schema-faq-question\">How to Check for Burnt Valves<\/strong> <p class=\"schema-faq-answer\">A professional will usually check for a burnt valve by performing a compression test, a leak down test, or both. A leak down test is usually the most accurate method. The test involves bringing the cylinder in question up to top dead center on the compression stroke (to seal the cylinder) and then adding compressed air to check for leaks.<br><br> If the cylinder head is removed&mdash;and you want to determine whether a suspect valve is burnt and leaking&mdash;you can perform a liquid leak down test.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1653621039376\"><strong class=\"schema-faq-question\">How to Fix a Burnt Valve<\/strong> <p class=\"schema-faq-answer\"><strong>A burnt valve cannot be fixed&mdash;it must be replaced<\/strong>. In some cases, a machine shop may be able to replace the valve and recondition the cylinder head for you. In other instances, the cylinder head may need to be replaced. You&rsquo;ll also want to address whatever caused the valve to burn in the first place to avoid repeat failure.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1653621040469\"><strong class=\"schema-faq-question\">Can You Drive with a Burnt Valve?<\/strong> <p class=\"schema-faq-answer\">You should not continue to drive with a burnt valve&mdash;additional damage to the vehicle may result. For example, a portion of the valve could break off, damaging other parts of the engine. Or a misfire (caused by the burnt valve) could harm the catalytic converter.<\/p> <\/div> <\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Find the Right Valves For Your Engine<\/h2>\n\n\n\n<p>Burnt or damaged valves can cause your engine to misfire and run rough. Ignoring this issue can hurt your vehicle&rsquo;s performance and even cause irreparable damage to your engine. You can easily get high-quality intake and exhaust valves here at CarParts.com.<\/p>\n\n\n\n<p>You don&rsquo;t need to search far and wide in stores or websites to find the right valves for your engine. You can simply enter your vehicle&rsquo;s year, make, and model in our vehicle selector, and you&rsquo;ll see a section of compatible engine valves from the leading aftermarket brands. CarParts.com has competitive pricing, so you can get the valves you need without breaking the bank. And since our warehouses are strategically located across the country, you&rsquo;ll get your order in no time.<\/p>\n\n\n\n<p>Don&rsquo;t let a faulty valve trouble your vehicle any longer. Browse our selection of affordable <a href=\"https:\/\/www.carparts.com\/intervalves\/intake-valve\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"intake valves\">intake valves<\/a> and <a href=\"https:\/\/www.carparts.com\/exhaust-valve\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"exhaust valves\">exhaust valves<\/a> here at CarParts.com and shop 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>Your car&rsquo;s engine contains a collection of valves working together to let air into the cylinders and exhaust gases out&#8230;. <a href=\"https:\/\/www.carparts.com\/blog\/burnt-valve-symptoms-causes-replacement-cost-faq\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":29,"featured_media":41975,"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":[52,3748],"tags":[3354,1183,1184],"ppma_author":[2622],"class_list":{"0":"post-41964","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-diy","8":"category-transmission","9":"tag-car-engine-all-articles","10":"tag-cylinder-head-2","11":"tag-exhaust-valve-2","12":"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>Burnt Valve: Symptoms, Causes, Replacement Cost, &amp; FAQ - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"Learn more about the symptoms and causes of a burnt valve, as well as how to check and fix the issue in this comprehensive guide.\" \/>\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\/burnt-valve-symptoms-causes-replacement-cost-faq\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Burnt Valve: Symptoms, Causes, Replacement Cost, &amp; FAQ - In The Garage with CarParts.com\" \/>\n<meta property=\"og:description\" content=\"Learn more about the symptoms and causes of a burnt valve, as well as how to check and fix the issue in this comprehensive guide.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.carparts.com\/blog\/burnt-valve-symptoms-causes-replacement-cost-faq\/\" \/>\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=\"2021-07-20T10:07:04+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-02-02T14:44:31+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/07\/damaged-valves-in-the-engine-head.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1700\" \/>\n\t<meta property=\"og:image:height\" content=\"1126\" \/>\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=\"6 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/burnt-valve-symptoms-causes-replacement-cost-faq\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/burnt-valve-symptoms-causes-replacement-cost-faq\\\/\"},\"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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