{"id":38498,"date":"2017-02-14T11:20:20","date_gmt":"2017-02-14T16:20:20","guid":{"rendered":"http:\/\/www.freeautomechanic.com\/mechanic\/forum\/?p=38498"},"modified":"2017-02-14T11:20:20","modified_gmt":"2017-02-14T16:20:20","slug":"ford-code-p0171-1997-ford-f150","status":"publish","type":"post","link":"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/2017\/02\/ford-code-p0171-1997-ford-f150","title":{"rendered":"Ford Code P0171 1997 Ford F150"},"content":{"rendered":"<p><img decoding=\"async\" class=\"aligncenter size-full wp-image-32552\" src=\"\/\/www.freeautomechanic.com\/mechanic\/forum\/wp-content\/uploads\/2016\/01\/1997-ford-f150.jpg\" alt=\"1997 Ford F150\" width=\"568\" height=\"396\" srcset=\"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/wp-content\/uploads\/2016\/01\/1997-ford-f150.jpg 568w, https:\/\/www.freeautomechanic.com\/mechanic\/forum\/wp-content\/uploads\/2016\/01\/1997-ford-f150-300x209.jpg 300w\" sizes=\"(max-width: 568px) 100vw, 568px\" \/>My truck has been experiencing a rough idle. After getting a diagnosis I was told that my truck was running rich. I then had a full tune up done on my truck and change the fuel injectors. Now my truck is running lean. What&#8217;s wrong with my truck? Help.<\/p>\n<hr \/>\n<p>RESPONSE<\/p>\n<p>First place to start would be to pull any diagnostic <a href=\"\/\/www.freeautomechanic.com\/diagnostictroblecodes.html\">trouble codes<\/a>. Autozone will do this for free. Then post the codes below in the comments. For now I will just guess what code you have.<\/p>\n<h3>Ford Code P0171 &#8211; Fuel Injection System Too Lean Bank 1<\/h3>\n<h4>Ford Code P0171 Possible causes<\/h4>\n<ul>\n<li>Intake air leaks<\/li>\n<li>Faulty front heated oxygen sensor<\/li>\n<li>Ignition misfiring<\/li>\n<li>Faulty fuel injectors<\/li>\n<li>Exhaust gas leaks<\/li>\n<li>Incorrect fuel pressure<\/li>\n<li>Lack of fuel<\/li>\n<li>Faulty <a href=\"\/\/www.freeautomechanic.com\/maf-mass-air-flow-sensor.html\">Mass Air Flow (MAF) sensor <\/a><\/li>\n<li>Incorrect Positive Crankcase Ventilation (PCV) hose connection<\/li>\n<\/ul>\n<p>If the P0171 is combined with the P0174 code, it&#8217;s very likely that the problem is caused by an intake leak. When there are no intake leaks, the next step is to replace the air filter and clean the air flow meter. If the problem persists the front oxygen (O2) sensor may need to be replaced.<\/p>\n<h4>Ford Code P0171 Description<\/h4>\n<p>With the Air\/Fuel Mixture Ratio Self-Learning Control, the actual mixture ratio can be brought closely to the theoretical mixture ratio based on the mixture ratio feedback signal from the heated oxygen sensors 1. The Engine Control Module (<a href=\"\/\/www.freeautomechanic.com\/pcm-engine-computer.html\">ECM<\/a>) calculates the necessary compensation to correct the offset between the actual and the theoretical ratios.<br \/>\nIn case the amount of the compensation value is extremely large (The actual mixture ratio is too lean.), the ECM judges the condition as the fuel injection system malfunction and light up the Malfunction Indicator Light (MIL) (2 trip detection logic).<\/p>\n","protected":false},"excerpt":{"rendered":"<p>My truck has been experiencing a rough idle. After getting a diagnosis I was told that my truck was running rich. I then had a full tune up done on my truck and change the fuel injectors. Now my truck is running lean. What&#8217;s wrong with my truck? Help. RESPONSE First place to start would&hellip;&nbsp;<a href=\"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/2017\/02\/ford-code-p0171-1997-ford-f150\" rel=\"bookmark\">Read More &raquo;<span class=\"screen-reader-text\">Ford Code P0171 1997 Ford F150<\/span><\/a><\/p>\n","protected":false},"author":14327,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"neve_meta_sidebar":"","neve_meta_container":"","neve_meta_enable_content_width":"","neve_meta_content_width":0,"neve_meta_title_alignment":"","neve_meta_author_avatar":"","neve_post_elements_order":"","neve_meta_disable_header":"","neve_meta_disable_footer":"","neve_meta_disable_title":"","footnotes":""},"categories":[1,5],"tags":[409,11383],"class_list":["post-38498","post","type-post","status-publish","format-standard","hentry","category-auto-repair-questions","category-ford","tag-f150","tag-ford-code-p0171"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v23.0 (Yoast SEO v27.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Ford Code P0171 1997 Ford F150 - FreeAutoMechanic Advice<\/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:\/\/www.freeautomechanic.com\/mechanic\/forum\/2017\/02\/ford-code-p0171-1997-ford-f150\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Ford Code P0171 1997 Ford F150\" \/>\n<meta property=\"og:description\" content=\"My truck has been experiencing a rough idle. After getting a diagnosis I was told that my truck was running rich. I then had a full tune up done on my truck and change the fuel injectors. Now my truck is running lean. What&#8217;s wrong with my truck? Help. RESPONSE First place to start would&hellip;&nbsp;Read More &raquo;Ford Code P0171 1997 Ford F150\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/2017\/02\/ford-code-p0171-1997-ford-f150\" \/>\n<meta property=\"og:site_name\" content=\"FreeAutoMechanic Advice\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/freeautomechanic\" \/>\n<meta property=\"article:published_time\" content=\"2017-02-14T16:20:20+00:00\" \/>\n<meta property=\"og:image\" content=\"\/\/www.freeautomechanic.com\/mechanic\/forum\/wp-content\/uploads\/2016\/01\/1997-ford-f150.jpg\" \/>\n<meta name=\"author\" content=\"Zel Thomas\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Zel Thomas\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"Ford Code P0171 1997 Ford F150 - FreeAutoMechanic Advice","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/2017\/02\/ford-code-p0171-1997-ford-f150","og_locale":"en_US","og_type":"article","og_title":"Ford Code P0171 1997 Ford F150","og_description":"My truck has been experiencing a rough idle. After getting a diagnosis I was told that my truck was running rich. I then had a full tune up done on my truck and change the fuel injectors. Now my truck is running lean. What&#8217;s wrong with my truck? Help. RESPONSE First place to start would&hellip;&nbsp;Read More &raquo;Ford Code P0171 1997 Ford F150","og_url":"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/2017\/02\/ford-code-p0171-1997-ford-f150","og_site_name":"FreeAutoMechanic Advice","article_publisher":"https:\/\/www.facebook.com\/freeautomechanic","article_published_time":"2017-02-14T16:20:20+00:00","og_image":[{"url":"\/\/www.freeautomechanic.com\/mechanic\/forum\/wp-content\/uploads\/2016\/01\/1997-ford-f150.jpg","type":"","width":"","height":""}],"author":"Zel Thomas","twitter_card":"summary_large_image","twitter_misc":{"Written by":"Zel Thomas","Est. reading time":"1 minute"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/2017\/02\/ford-code-p0171-1997-ford-f150#article","isPartOf":{"@id":"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/2017\/02\/ford-code-p0171-1997-ford-f150"},"author":{"name":"Zel Thomas","@id":"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/#\/schema\/person\/e562af884b832b4fae560041674260d2"},"headline":"Ford Code P0171 1997 Ford F150","datePublished":"2017-02-14T16:20:20+00:00","mainEntityOfPage":{"@id":"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/2017\/02\/ford-code-p0171-1997-ford-f150"},"wordCount":296,"commentCount":2,"publisher":{"@id":"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/#organization"},"keywords":["F150","Ford Code P0171"],"articleSection":["Auto Repair Questions","Ford"],"inLanguage":"en-US","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https:\/\/www.freeautomechanic.com\/mechanic\/forum\/2017\/02\/ford-code-p0171-1997-ford-f150#respond"]}]},{"@type":"WebPage","@id":"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/2017\/02\/ford-code-p0171-1997-ford-f150","url":"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/2017\/02\/ford-code-p0171-1997-ford-f150","name":"Ford Code P0171 1997 Ford F150 - 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