{"id":95768,"date":"2025-09-25T16:34:31","date_gmt":"2025-09-25T11:04:31","guid":{"rendered":"https:\/\/www.seminarsonly.com\/news\/?p=95768"},"modified":"2025-09-25T16:43:13","modified_gmt":"2025-09-25T11:13:13","slug":"how-do-i-fix-code-p0304-cylinder-4-misfire-detected","status":"publish","type":"post","link":"https:\/\/seminarsonly.com\/news\/how-do-i-fix-code-p0304-cylinder-4-misfire-detected\/","title":{"rendered":"How Do I Fix Code P0304? | Cylinder 4 Misfire Detected"},"content":{"rendered":"<h3 data-start=\"0\" data-end=\"234\"><span style=\"color: #008000;\"><em>A <strong data-start=\"2\" data-end=\"11\">P0304<\/strong> trouble code means <strong data-start=\"31\" data-end=\"65\">\u201ccylinder 4 misfire detected.\u201d <\/strong>That means that the engine computer has detected that the 4th cylinder is misfiring (i.e. not combusting properly) repeatedly.<\/em><\/span><\/h3>\n<p data-start=\"236\" data-end=\"417\">Here\u2019s how you can <strong data-start=\"255\" data-end=\"275\">diagnose and fix<\/strong> it.<\/p>\n<hr data-start=\"419\" data-end=\"422\" \/>\n<h2 data-start=\"424\" data-end=\"452\"><span style=\"color: #800000;\">\ud83e\uddf0 Symptoms You Might See<\/span><\/h2>\n<p data-start=\"454\" data-end=\"497\">When P0304 is active, you might experience:<\/p>\n<ul data-start=\"499\" data-end=\"820\">\n<li data-start=\"499\" data-end=\"523\">\n<p data-start=\"501\" data-end=\"523\">Rough idle \/ shaking<\/p>\n<\/li>\n<li data-start=\"524\" data-end=\"573\">\n<p data-start=\"526\" data-end=\"573\">Engine hesitation, jerking under acceleration<\/p>\n<\/li>\n<li data-start=\"574\" data-end=\"591\">\n<p data-start=\"576\" data-end=\"591\">Loss of power<\/p>\n<\/li>\n<li data-start=\"592\" data-end=\"619\">\n<p data-start=\"594\" data-end=\"619\">Drop in fuel efficiency<\/p>\n<\/li>\n<li data-start=\"620\" data-end=\"666\">\n<p data-start=\"622\" data-end=\"666\">Check engine light (\u201cService Engine Soon\u201d)<\/p>\n<\/li>\n<li data-start=\"667\" data-end=\"820\">\n<p data-start=\"669\" data-end=\"820\">Possibly a <strong data-start=\"680\" data-end=\"692\">flashing<\/strong> CEL if misfire is severe \u2014 which indicates you should stop driving soon to avoid damage<\/p>\n<\/li>\n<\/ul>\n<h3>Also Read : <a href=\"https:\/\/www.seminarsonly.com\/news\/fixed-skate-you-have-been-kicked-from-the-server\/\">Fixed : Skate You Have Been Kicked from the Server<\/a><\/h3>\n<hr data-start=\"822\" data-end=\"825\" \/>\n<h2 data-start=\"827\" data-end=\"846\"><span style=\"color: #800000;\">\ud83d\udd0d Common Causes<\/span><\/h2>\n<p data-start=\"848\" data-end=\"909\">Here are the most common culprits for a cylinder\u20114 misfire:<\/p>\n<div class=\"_tableContainer_1rjym_1\">\n<div class=\"group _tableWrapper_1rjym_13 flex w-fit flex-col-reverse\" tabindex=\"-1\">\n<table class=\"w-fit min-w-(--thread-content-width)\" style=\"height: 449px;\" width=\"995\" data-start=\"911\" data-end=\"2278\">\n<thead data-start=\"911\" data-end=\"971\">\n<tr data-start=\"911\" data-end=\"971\">\n<th data-start=\"911\" data-end=\"932\" data-col-size=\"md\"><span style=\"color: #000080;\">Component \/ System<\/span><\/th>\n<th data-start=\"932\" data-end=\"971\" data-col-size=\"lg\"><span style=\"color: #000080;\">How it causes misfire in cylinder 4<\/span><\/th>\n<\/tr>\n<\/thead>\n<tbody data-start=\"982\" data-end=\"2278\">\n<tr data-start=\"982\" data-end=\"1147\">\n<td data-start=\"982\" data-end=\"1002\" data-col-size=\"md\"><strong data-start=\"984\" data-end=\"1001\">Spark Plug #4<\/strong><\/td>\n<td data-start=\"1002\" data-end=\"1147\" data-col-size=\"lg\">Worn, fouled, damaged, improper gap, or oil\/soot contamination \u2192 can\u2019t ignite the air\/fuel mix properly<\/td>\n<\/tr>\n<tr data-start=\"1148\" data-end=\"1294\">\n<td data-start=\"1148\" data-end=\"1206\" data-col-size=\"md\"><strong data-start=\"1150\" data-end=\"1170\">Ignition Coil #4<\/strong> (or coil pack, or ignition module)<\/td>\n<td data-col-size=\"lg\" data-start=\"1206\" data-end=\"1294\">If the coil fails, the spark is weak or absent<\/td>\n<\/tr>\n<tr data-start=\"1295\" data-end=\"1434\">\n<td data-start=\"1295\" data-end=\"1321\" data-col-size=\"md\"><strong data-start=\"1297\" data-end=\"1320\">Wiring \/ connectors<\/strong><\/td>\n<td data-start=\"1321\" data-end=\"1434\" data-col-size=\"lg\">Broken, corroded, loose, shorted wires to coil, spark plug, or injector<\/td>\n<\/tr>\n<tr data-start=\"1435\" data-end=\"1577\">\n<td data-start=\"1435\" data-end=\"1458\" data-col-size=\"md\"><strong data-start=\"1437\" data-end=\"1457\">Fuel injector #4<\/strong><\/td>\n<td data-col-size=\"lg\" data-start=\"1458\" data-end=\"1577\">If clogged, leaking, or electrically failing, it may not supply fuel properly<\/td>\n<\/tr>\n<tr data-start=\"1578\" data-end=\"1735\">\n<td data-start=\"1578\" data-end=\"1618\" data-col-size=\"md\"><strong data-start=\"1580\" data-end=\"1617\">Fuel pressure \/ fuel system issue<\/strong><\/td>\n<td data-start=\"1618\" data-end=\"1735\" data-col-size=\"lg\">If fuel pressure is too low (or inconsistent), that cylinder may be starved<\/td>\n<\/tr>\n<tr data-start=\"1736\" data-end=\"1891\">\n<td data-start=\"1736\" data-end=\"1764\" data-col-size=\"md\"><strong data-start=\"1738\" data-end=\"1763\">Vacuum \/ intake leaks<\/strong><\/td>\n<td data-col-size=\"lg\" data-start=\"1764\" data-end=\"1891\">Extra air entering the combustion chamber upsets the air\/fuel ratio, causing misfires<\/td>\n<\/tr>\n<tr data-start=\"1892\" data-end=\"2093\">\n<td data-start=\"1892\" data-end=\"1936\" data-col-size=\"md\"><strong data-start=\"1894\" data-end=\"1935\">Low compression \/ mechanical problems<\/strong><\/td>\n<td data-start=\"1936\" data-end=\"2093\" data-col-size=\"lg\">Worn piston rings, leaking valves, head gasket issue, etc. \u2014 when compression is low, proper combustion can\u2019t occur<\/td>\n<\/tr>\n<tr data-start=\"2094\" data-end=\"2278\">\n<td data-start=\"2094\" data-end=\"2124\" data-col-size=\"md\"><strong data-start=\"2096\" data-end=\"2123\">Other sensors \/ modules<\/strong><\/td>\n<td data-start=\"2124\" data-end=\"2278\" data-col-size=\"lg\">Rarely, problems in camshaft position sensor, crank sensor, or engine control module may play a role in misreads<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<hr data-start=\"2280\" data-end=\"2283\" \/>\n<h2 data-start=\"2285\" data-end=\"2320\"><span style=\"color: #800000;\">\ud83d\udee0 Diagnostic Steps &amp; How to Fix<\/span><\/h2>\n<p data-start=\"2322\" data-end=\"2462\">Here\u2019s a step\u2011by\u2011step process you can follow (or have a mechanic follow). Always work safely (engine off, ignition off, proper tools, etc.).<\/p>\n<ol data-start=\"2464\" data-end=\"4766\">\n<li data-start=\"2464\" data-end=\"2644\">\n<h3 data-start=\"2467\" data-end=\"2644\"><span style=\"color: #000080;\"><strong data-start=\"2467\" data-end=\"2521\">Read &amp; record all error codes (use OBD\u2011II scanner)<\/strong><\/span><\/h3>\n<ul data-start=\"2464\" data-end=\"4766\">\n<li data-start=\"2464\" data-end=\"2644\">\n<p data-start=\"2467\" data-end=\"2644\">Sometimes multiple misfire or related codes appear. That gives you context.<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<li data-start=\"2649\" data-end=\"2837\">\n<h3 data-start=\"2652\" data-end=\"2837\"><span style=\"color: #000080;\"><strong data-start=\"2652\" data-end=\"2677\">Clear the code &amp; test<\/strong><\/span><\/h3>\n<ul data-start=\"2464\" data-end=\"4766\">\n<li data-start=\"2649\" data-end=\"2837\">\n<p data-start=\"2652\" data-end=\"2837\">Reset the codes, then run the engine \/ drive. Sometimes it was a temporary glitch. If P0304 comes back, proceed.<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<li data-start=\"2839\" data-end=\"3081\">\n<h3 data-start=\"2842\" data-end=\"2869\"><span style=\"color: #000080;\"><strong data-start=\"2842\" data-end=\"2867\">Inspect spark plug #4<\/strong><\/span><\/h3>\n<ul data-start=\"2873\" data-end=\"3081\">\n<li data-start=\"2873\" data-end=\"2945\">\n<p data-start=\"2875\" data-end=\"2945\">Remove it and look for signs of wear, fouling (oil, carbon), cracks.<\/p>\n<\/li>\n<li data-start=\"2949\" data-end=\"2983\">\n<p data-start=\"2951\" data-end=\"2983\">Check the plug gap is correct.<\/p>\n<\/li>\n<li data-start=\"2987\" data-end=\"3081\">\n<p data-start=\"2989\" data-end=\"3081\">If it\u2019s old or in questionable shape, replace it (often replaced by OEM recommended plug).<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<li data-start=\"3083\" data-end=\"3421\">\n<h3 data-start=\"3086\" data-end=\"3134\"><span style=\"color: #000080;\"><strong data-start=\"3086\" data-end=\"3132\">Check the ignition coil \/ coil pack for #4<\/strong><\/span><\/h3>\n<ul data-start=\"3138\" data-end=\"3421\">\n<li data-start=\"3138\" data-end=\"3203\">\n<p data-start=\"3140\" data-end=\"3203\">Swap coil #4 with a coil from another cylinder (say coil #3).<\/p>\n<\/li>\n<li data-start=\"3207\" data-end=\"3388\">\n<p data-start=\"3209\" data-end=\"3388\">Clear codes and re-run. If the misfire \u201cmoves\u201d to cylinder 3, the coil was the issue. If it stays on 4, the coil is likely not the issue.<\/p>\n<\/li>\n<li data-start=\"3392\" data-end=\"3421\">\n<p data-start=\"3394\" data-end=\"3421\">If coil is bad, replace it.<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<li data-start=\"3423\" data-end=\"3611\">\n<h3 data-start=\"3426\" data-end=\"3469\"><span style=\"color: #000080;\"><strong data-start=\"3426\" data-end=\"3467\">Inspect wiring, connectors, harnesses<\/strong><\/span><\/h3>\n<ul data-start=\"3473\" data-end=\"3611\">\n<li data-start=\"3473\" data-end=\"3556\">\n<p data-start=\"3475\" data-end=\"3556\">Look for loose connectors, corrosion, broken wires around coil, plug, injector.<\/p>\n<\/li>\n<li data-start=\"3560\" data-end=\"3611\">\n<p data-start=\"3562\" data-end=\"3611\">Repair or replace any faulty wires or connectors.<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<li data-start=\"3613\" data-end=\"3909\">\n<h3 data-start=\"3616\" data-end=\"3660\"><span style=\"color: #000080;\"><strong data-start=\"3616\" data-end=\"3658\">Fuel injector test \/ check injector #4<\/strong><\/span><\/h3>\n<ul data-start=\"3664\" data-end=\"3909\">\n<li data-start=\"3664\" data-end=\"3749\">\n<p data-start=\"3666\" data-end=\"3749\">Use a noid light or injector tester to see if the injector is getting the signal.<\/p>\n<\/li>\n<li data-start=\"3753\" data-end=\"3846\">\n<p data-start=\"3755\" data-end=\"3846\">You can also swap injectors (if same type) with another cylinder to see if misfire moves.<\/p>\n<\/li>\n<li data-start=\"3850\" data-end=\"3909\">\n<p data-start=\"3852\" data-end=\"3909\">Clean or replace the injector if it\u2019s clogged or failing.<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<li data-start=\"3911\" data-end=\"4081\">\n<h3 data-start=\"3914\" data-end=\"3955\"><span style=\"color: #000080;\"><strong data-start=\"3914\" data-end=\"3953\">Check fuel pressure \/ fuel delivery<\/strong><\/span><\/h3>\n<ul data-start=\"3959\" data-end=\"4081\">\n<li data-start=\"3959\" data-end=\"3989\">\n<p data-start=\"3961\" data-end=\"3989\">Use a fuel pressure gauge.<\/p>\n<\/li>\n<li data-start=\"3993\" data-end=\"4037\">\n<p data-start=\"3995\" data-end=\"4037\">Replace or clean fuel filter if clogged.<\/p>\n<\/li>\n<li data-start=\"4041\" data-end=\"4081\">\n<p data-start=\"4043\" data-end=\"4081\">Ensure fuel pump is working correctly.<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<li data-start=\"4083\" data-end=\"4295\">\n<h3 data-start=\"4086\" data-end=\"4138\"><span style=\"color: #000080;\"><strong data-start=\"4086\" data-end=\"4136\">Check for vacuum leaks \/ intake manifold leaks<\/strong><\/span><\/h3>\n<ul data-start=\"4142\" data-end=\"4295\">\n<li data-start=\"4142\" data-end=\"4183\">\n<p data-start=\"4144\" data-end=\"4183\">Inspect vacuum hoses near cylinder 4.<\/p>\n<\/li>\n<li data-start=\"4187\" data-end=\"4247\">\n<p data-start=\"4189\" data-end=\"4247\">Use a smoke machine or listen for hissing to find leaks.<\/p>\n<\/li>\n<li data-start=\"4251\" data-end=\"4295\">\n<p data-start=\"4253\" data-end=\"4295\">Repair or replace leaking hoses \/ gaskets.<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<li data-start=\"4297\" data-end=\"4514\">\n<h3 data-start=\"4300\" data-end=\"4333\"><span style=\"color: #000080;\"><strong data-start=\"4300\" data-end=\"4331\">Compression \/ leakdown test<\/strong><\/span><\/h3>\n<ul data-start=\"4337\" data-end=\"4514\">\n<li data-start=\"4337\" data-end=\"4456\">\n<p data-start=\"4339\" data-end=\"4456\">Measure compression in cylinder 4 vs other cylinders. If it\u2019s significantly lower, that suggests mechanical issues.<\/p>\n<\/li>\n<li data-start=\"4460\" data-end=\"4514\">\n<p data-start=\"4462\" data-end=\"4514\">A leakdown test can isolate valve or sealing issues.<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<li data-start=\"4516\" data-end=\"4668\">\n<h3 data-start=\"4520\" data-end=\"4561\"><span style=\"color: #000080;\"><strong data-start=\"4520\" data-end=\"4559\">Repair mechanical problems if found<\/strong><\/span><\/h3>\n<ul data-start=\"4566\" data-end=\"4668\">\n<li data-start=\"4566\" data-end=\"4668\">\n<p data-start=\"4568\" data-end=\"4668\">If valves, rings, head gasket, etc. are faulty, those need more in\u2011depth engine work or replacement.<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<li data-start=\"4670\" data-end=\"4766\">\n<h3 data-start=\"4674\" data-end=\"4720\"><span style=\"color: #000080;\"><strong data-start=\"4674\" data-end=\"4718\">After repair, clear codes and test drive<\/strong><\/span><\/h3>\n<ul data-start=\"4725\" data-end=\"4766\">\n<li data-start=\"4725\" data-end=\"4766\">\n<p data-start=\"4727\" data-end=\"4766\">Ensure the misfire code doesn\u2019t return.<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<hr data-start=\"4768\" data-end=\"4771\" \/>\n<h2 data-start=\"4773\" data-end=\"4794\"><span style=\"color: #800000;\">\ud83d\udca1 Tips &amp; Warnings<\/span><\/h2>\n<ul data-start=\"4796\" data-end=\"5427\">\n<li data-start=\"4796\" data-end=\"4989\">\n<p data-start=\"4798\" data-end=\"4989\"><strong data-start=\"4798\" data-end=\"4813\">Don\u2019t delay<\/strong> \u2014 misfire codes, if left untreated, may damage the catalytic converter (unburned fuel passing through) and worsen engine performance.<\/p>\n<\/li>\n<li data-start=\"4990\" data-end=\"5112\">\n<p data-start=\"4992\" data-end=\"5112\">Start with the <strong data-start=\"5007\" data-end=\"5042\">cheapest &amp; simplest fixes first<\/strong> (spark plug, coil, wiring) before moving to more expensive repairs.<\/p>\n<\/li>\n<li data-start=\"5113\" data-end=\"5195\">\n<p data-start=\"5115\" data-end=\"5195\">Keep track of which parts you changed so you don\u2019t replace everything blindly.<\/p>\n<\/li>\n<li data-start=\"5196\" data-end=\"5306\">\n<p data-start=\"5198\" data-end=\"5306\">If multiple cylinders misfire (P0300 etc.), the problem may be more systemic (fuel system, sensors, etc.).<\/p>\n<\/li>\n<li data-start=\"5307\" data-end=\"5427\">\n<p data-start=\"5309\" data-end=\"5427\">Use OEM or good quality replacement parts (coils, injectors, plugs) because inferior parts can cause recurring issues.<\/p>\n<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>A P0304 trouble code means \u201ccylinder 4 misfire detected.\u201d That means that the engine computer has detected that the 4th cylinder is misfiring (i.e. not combusting properly) repeatedly. Here\u2019s how&hellip;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6048],"tags":[],"class_list":["post-95768","post","type-post","status-publish","format-standard","hentry","category-error-fix"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.2 (Yoast SEO v27.2) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>How Do I Fix Code P0304? | Cylinder 4 Misfire Detected - Seminarsonly.com<\/title>\n<meta name=\"description\" content=\"A P0304 trouble code means \u201ccylinder 4 misfire detected.\u201d That means that the engine computer has detected that the 4th cylinder is misfiring (i.e. not combusting properly) repeatedly.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/seminarsonly.com\/news\/how-do-i-fix-code-p0304-cylinder-4-misfire-detected\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How Do I Fix Code P0304? 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