When I start the car it drive okay until it warms up to operating temperature then it won’t go over 20mph. It is a 2004 Hyundai Accent manual.<\/p>\n\n\n\n
The check engine light codes will help guide you in the right direction. Without the codes you are pretty much just guessing. My thoughts are you have some kind of failed sensor. The reason is the engine is in a closed loop and uses preset parameters to function until it warms up. At this point it no longer uses the preset parameters and relies on the engine sensors. A faulty sensor or reading from a sensor it casing the ECM <\/a>to go into LIMP mode. This is for safety reasons and will continue to function this way until the proper repairs are made. If you have the engine codes, post them below in the comments. <\/p>\n","protected":false},"excerpt":{"rendered":" When I start the car it drive okay until it warms up to operating temperature then it won’t go over 20mph. It is a 2004 Hyundai Accent manual. The check engine light codes will help guide you in the right direction. Without the codes you are pretty much just guessing. My thoughts are you have… Read More »2004 Hyundai won’t go over 20mph<\/span><\/a><\/p>\n","protected":false},"author":17234,"featured_media":32891,"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],"tags":[],"class_list":["post-79152","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-auto-repair-questions"],"_links":{"self":[{"href":"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/wp-json\/wp\/v2\/posts\/79152","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/wp-json\/wp\/v2\/users\/17234"}],"replies":[{"embeddable":true,"href":"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/wp-json\/wp\/v2\/comments?post=79152"}],"version-history":[{"count":0,"href":"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/wp-json\/wp\/v2\/posts\/79152\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/wp-json\/wp\/v2\/media\/32891"}],"wp:attachment":[{"href":"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/wp-json\/wp\/v2\/media?parent=79152"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/wp-json\/wp\/v2\/categories?post=79152"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/wp-json\/wp\/v2\/tags?post=79152"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}