{"id":7582,"date":"2026-06-08T10:11:10","date_gmt":"2026-06-08T10:11:10","guid":{"rendered":"http:\/\/australianholden.com\/?p=7582"},"modified":"2026-06-20T23:27:39","modified_gmt":"2026-06-20T23:27:39","slug":"vy-commodore-fuel-economy-problems","status":"publish","type":"post","link":"https:\/\/australianholden.com\/index.php\/2026\/06\/08\/vy-commodore-fuel-economy-problems\/","title":{"rendered":"VY Commodore Fuel Economy Problems"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Poor fuel economy is a common complaint among VY Commodore owners, especially as these vehicles age and accumulate high kilometres. While the VY was reasonably efficient for its time, real-world fuel consumption can increase significantly due to mechanical wear, sensor issues, driving conditions, and maintenance problems.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This guide explains the most common causes of poor fuel economy in the VY Commodore, how to diagnose them, and the best ways to improve efficiency.<\/p>\n\n\n<div id=\"fu_ebay_0\"><!-- Presentation: cols = 4, rows = 2, slideshow = Manual, slides = 3, slideId = 0 --><div class=\"fu_ebay_results_container \">\n<h5 class=\"fu_ebay_results_title\" style=\"display: block !important;\">\n<a name=\"fu_slidetop_0\"><\/a><a href=\"https:\/\/www.ebay.com.au\/?mkcid=1&#038;mkrid=705-53470-19255-0&#038;siteid=15&#038;campid=5339152561&#038;customid=5339151688&#038;toolid=10049&#038;mkevt=1\" class=\"fu_ebay\" style=\"display:inline !important;\" rel=\"nofollow\" target=\"_blank\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/australianholden.com\/wp-content\/plugins\/fast-ebay-listings\/US\/Right_Now_108x45.gif?resize=108%2C45&#038;ssl=1\" style=\"border:0;display:block !important;\" width=\"108\" height=\"45\" alt=\"Right Now on eBay\"\/><\/a>&nbsp;Fuel Injectors<\/h5>\nLoading&#8230;<\/div>\n<\/div>\n<script>\n<!--\nvar content_fu_ebay_0 = null;\nvar waitForDepends_fu_ebay_0 = setInterval(function () {\n  if (typeof jQuery !== \"undefined\") {\n  if (window.fu_is_bot_useragent !== undefined) {\n    clearInterval(waitForDepends_fu_ebay_0);\n    if (typeof jQuery.ajax == \"undefined\") {\n      console.log(\"Fast eBay Listings: jQuery.ajax missing. Are you using jQuery.Slim that doesn't include ajax? \");\n      return;\n    }\n    if (fu_is_bot_useragent) return;\n    content_fu_ebay_0 = jQuery(\"#fu_ebay_0\");\n    jQuery(document).ready(jQuery.ajax({\n      type : \"post\",\n      url : \"https:\/\/australianholden.com\/wp-admin\/admin-ajax.php\",\n      data : {\n        action : \"fu_ebay_load_search\",\nfuDisableAPICache : 0,\nfuTraceLogging : 0,\nebay_country : \"AU\",\nfu_ebay_customId : \"\",\nfu_ebay_widget : 0,\nfu_ebay_picwidth : 225,\nfu_ebay_arrangement : 0,\nfu_ebay_title : \"Fuel Injectors\",\nfu_ebay_query : \"VY Commodore fuel injectors\",\nfu_ebay_searchInDesc : 0,\nfu_ebay_searchLocation : \"Internationally\",\nfu_ebay_pickupPostcode : \"\",\nfu_ebay_pickupRadius : 0,\nfu_ebay_sort : \"BestMatch\",\nfu_ebay_categoryIds : \"6030\",\nfu_ebay_sellers : \"\",\nfu_ebay_sellerType : \"\",\nfu_ebay_buyingOptions : \"\",\nfu_ebay_conditionOptions : \"\",\nfu_ebay_minPrice : 0,\nfu_ebay_maxPrice : 0,\nfu_ebay_minBids : 0,\nfu_ebay_maxBids : 0,\nfu_cols : 4,\nfu_rows : 2,\nfu_slideshow : \"Manual\",\nfu_slides : 3,\nfu_slideId : 0,\n\n      },\n      success : function( response ) {\n        content_fu_ebay_0.html( response );\n      },\n      error: function(e) {\n        console.log(\"Fast eBay Listings: deferred loading error: \" + e);\n      }\n    }));\n  }}\n}, 10);\n\/\/-->\n<\/script>\n\n\n\n<h1 class=\"wp-block-heading\">What Is Normal Fuel Economy?<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Fuel consumption varies depending on engine type and condition.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Typical Figures (Approximate)<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>3.8L Ecotec V6: 10\u201313L\/100km (mixed driving)<\/li>\n\n\n\n<li>V6 city driving: 12\u201315L\/100km<\/li>\n\n\n\n<li>Highway driving: 8\u201310L\/100km<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Poor condition vehicles can exceed these figures significantly.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Common Fuel Economy Symptoms<\/h1>\n\n\n\n<h3 class=\"wp-block-heading\">Warning Signs<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Excessive fuel usage<\/li>\n\n\n\n<li>Frequent refuelling<\/li>\n\n\n\n<li>Reduced driving range<\/li>\n\n\n\n<li>Poor throttle response<\/li>\n\n\n\n<li>Strong fuel smell<\/li>\n\n\n\n<li>Black exhaust smoke (in severe cases)<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Fuel economy usually worsens gradually over time.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">1. Oxygen Sensor Failure<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Faulty oxygen sensors are one of the most common causes of poor fuel economy.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Symptoms<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Increased fuel consumption<\/li>\n\n\n\n<li>Rough idle<\/li>\n\n\n\n<li>Check engine light<\/li>\n\n\n\n<li>Poor throttle response<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Causes<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Age-related sensor wear<\/li>\n\n\n\n<li>Carbon contamination<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Oxygen sensors play a key role in air-fuel mixture control.<\/p>\n\n\n<div id=\"fu_ebay_1\"><!-- Presentation: cols = 4, rows = 2, slideshow = Manual, slides = 3, slideId = 1 --><div class=\"fu_ebay_results_container \">\n<h5 class=\"fu_ebay_results_title\" style=\"display: block !important;\">\n<a name=\"fu_slidetop_1\"><\/a><a href=\"https:\/\/www.ebay.com.au\/?mkcid=1&#038;mkrid=705-53470-19255-0&#038;siteid=15&#038;campid=5339152561&#038;customid=5339151688&#038;toolid=10049&#038;mkevt=1\" class=\"fu_ebay\" style=\"display:inline !important;\" rel=\"nofollow\" target=\"_blank\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/australianholden.com\/wp-content\/plugins\/fast-ebay-listings\/US\/Right_Now_108x45.gif?resize=108%2C45&#038;ssl=1\" style=\"border:0;display:block !important;\" width=\"108\" height=\"45\" alt=\"Right Now on eBay\"\/><\/a>&nbsp;02 sensor<\/h5>\nLoading&#8230;<\/div>\n<\/div>\n<script>\n<!--\nvar content_fu_ebay_1 = null;\nvar waitForDepends_fu_ebay_1 = setInterval(function () {\n  if (typeof jQuery !== \"undefined\") {\n  if (window.fu_is_bot_useragent !== undefined) {\n    clearInterval(waitForDepends_fu_ebay_1);\n    if (typeof jQuery.ajax == \"undefined\") {\n      console.log(\"Fast eBay Listings: jQuery.ajax missing. Are you using jQuery.Slim that doesn't include ajax? \");\n      return;\n    }\n    if (fu_is_bot_useragent) return;\n    content_fu_ebay_1 = jQuery(\"#fu_ebay_1\");\n    jQuery(document).ready(jQuery.ajax({\n      type : \"post\",\n      url : \"https:\/\/australianholden.com\/wp-admin\/admin-ajax.php\",\n      data : {\n        action : \"fu_ebay_load_search\",\nfuDisableAPICache : 0,\nfuTraceLogging : 0,\nebay_country : \"AU\",\nfu_ebay_customId : \"\",\nfu_ebay_widget : 0,\nfu_ebay_picwidth : 225,\nfu_ebay_arrangement : 0,\nfu_ebay_title : \"02 sensor\",\nfu_ebay_query : \"VY Commodore 02 Sensor\",\nfu_ebay_searchInDesc : 0,\nfu_ebay_searchLocation : \"Internationally\",\nfu_ebay_pickupPostcode : \"\",\nfu_ebay_pickupRadius : 0,\nfu_ebay_sort : \"BestMatch\",\nfu_ebay_categoryIds : \"6030\",\nfu_ebay_sellers : \"\",\nfu_ebay_sellerType : \"\",\nfu_ebay_buyingOptions : \"\",\nfu_ebay_conditionOptions : \"\",\nfu_ebay_minPrice : 0,\nfu_ebay_maxPrice : 0,\nfu_ebay_minBids : 0,\nfu_ebay_maxBids : 0,\nfu_cols : 4,\nfu_rows : 2,\nfu_slideshow : \"Manual\",\nfu_slides : 3,\nfu_slideId : 1,\n\n      },\n      success : function( response ) {\n        content_fu_ebay_1.html( response );\n      },\n      error: function(e) {\n        console.log(\"Fast eBay Listings: deferred loading error: \" + e);\n      }\n    }));\n  }}\n}, 10);\n\/\/-->\n<\/script>\n\n\n\n<h1 class=\"wp-block-heading\">2. Dirty or Faulty MAF Sensor<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">The Mass Air Flow (MAF) sensor measures incoming air.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Symptoms<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>High fuel usage<\/li>\n\n\n\n<li>Hesitation during acceleration<\/li>\n\n\n\n<li>Rough running<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Causes<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Dirt buildup<\/li>\n\n\n\n<li>Oil contamination<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">A faulty MAF can cause the engine to run rich.<\/p>\n\n\n<div id=\"fu_ebay_2\"><!-- Presentation: cols = 4, rows = 2, slideshow = Manual, slides = 3, slideId = 2 --><div class=\"fu_ebay_results_container \">\n<h5 class=\"fu_ebay_results_title\" style=\"display: block !important;\">\n<a name=\"fu_slidetop_2\"><\/a><a href=\"https:\/\/www.ebay.com.au\/?mkcid=1&#038;mkrid=705-53470-19255-0&#038;siteid=15&#038;campid=5339152561&#038;customid=5339151688&#038;toolid=10049&#038;mkevt=1\" class=\"fu_ebay\" style=\"display:inline !important;\" rel=\"nofollow\" target=\"_blank\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/australianholden.com\/wp-content\/plugins\/fast-ebay-listings\/US\/Right_Now_108x45.gif?resize=108%2C45&#038;ssl=1\" style=\"border:0;display:block !important;\" width=\"108\" height=\"45\" alt=\"Right Now on eBay\"\/><\/a>&nbsp;MAF sensor<\/h5>\nLoading&#8230;<\/div>\n<\/div>\n<script>\n<!--\nvar content_fu_ebay_2 = null;\nvar waitForDepends_fu_ebay_2 = setInterval(function () {\n  if (typeof jQuery !== \"undefined\") {\n  if (window.fu_is_bot_useragent !== undefined) {\n    clearInterval(waitForDepends_fu_ebay_2);\n    if (typeof jQuery.ajax == \"undefined\") {\n      console.log(\"Fast eBay Listings: jQuery.ajax missing. Are you using jQuery.Slim that doesn't include ajax? \");\n      return;\n    }\n    if (fu_is_bot_useragent) return;\n    content_fu_ebay_2 = jQuery(\"#fu_ebay_2\");\n    jQuery(document).ready(jQuery.ajax({\n      type : \"post\",\n      url : \"https:\/\/australianholden.com\/wp-admin\/admin-ajax.php\",\n      data : {\n        action : \"fu_ebay_load_search\",\nfuDisableAPICache : 0,\nfuTraceLogging : 0,\nebay_country : \"AU\",\nfu_ebay_customId : \"\",\nfu_ebay_widget : 0,\nfu_ebay_picwidth : 225,\nfu_ebay_arrangement : 0,\nfu_ebay_title : \"MAF sensor\",\nfu_ebay_query : \"VY Commodore MAF sensor\",\nfu_ebay_searchInDesc : 0,\nfu_ebay_searchLocation : \"Internationally\",\nfu_ebay_pickupPostcode : \"\",\nfu_ebay_pickupRadius : 0,\nfu_ebay_sort : \"BestMatch\",\nfu_ebay_categoryIds : \"6030\",\nfu_ebay_sellers : \"\",\nfu_ebay_sellerType : \"\",\nfu_ebay_buyingOptions : \"\",\nfu_ebay_conditionOptions : \"\",\nfu_ebay_minPrice : 0,\nfu_ebay_maxPrice : 0,\nfu_ebay_minBids : 0,\nfu_ebay_maxBids : 0,\nfu_cols : 4,\nfu_rows : 2,\nfu_slideshow : \"Manual\",\nfu_slides : 3,\nfu_slideId : 2,\n\n      },\n      success : function( response ) {\n        content_fu_ebay_2.html( response );\n      },\n      error: function(e) {\n        console.log(\"Fast eBay Listings: deferred loading error: \" + e);\n      }\n    }));\n  }}\n}, 10);\n\/\/-->\n<\/script>\n\n\n\n<h1 class=\"wp-block-heading\">3. Engine Coolant Temperature Sensor Issues<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">If the ECU thinks the engine is cold, it will inject more fuel.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Symptoms<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>High fuel consumption<\/li>\n\n\n\n<li>Rich running condition<\/li>\n\n\n\n<li>Hard starting when warm<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Causes<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Sensor failure<\/li>\n\n\n\n<li>Wiring faults<\/li>\n<\/ul>\n\n\n\n<h1 class=\"wp-block-heading\">4. Fuel Injector Problems<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Worn or leaking injectors can increase fuel usage.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Symptoms<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Fuel smell<\/li>\n\n\n\n<li>Rough idle<\/li>\n\n\n\n<li>Poor economy<\/li>\n\n\n\n<li>Misfires<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Causes<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Carbon buildup<\/li>\n\n\n\n<li>Electrical faults<\/li>\n\n\n\n<li>Leaking injectors<\/li>\n<\/ul>\n\n\n\n<h1 class=\"wp-block-heading\">5. Faulty Thermostat<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">A stuck-open thermostat prevents the engine reaching operating temperature.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Symptoms<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Poor fuel economy<\/li>\n\n\n\n<li>Slow warm-up<\/li>\n\n\n\n<li>Weak heater performance<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Causes<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Mechanical failure<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Engines running cold consume more fuel.<\/p>\n\n\n<div id=\"fu_ebay_3\"><!-- Presentation: cols = 4, rows = 2, slideshow = Manual, slides = 3, slideId = 3 --><div class=\"fu_ebay_results_container \">\n<h5 class=\"fu_ebay_results_title\" style=\"display: block !important;\">\n<a name=\"fu_slidetop_3\"><\/a><a href=\"https:\/\/www.ebay.com.au\/?mkcid=1&#038;mkrid=705-53470-19255-0&#038;siteid=15&#038;campid=5339152561&#038;customid=5339151688&#038;toolid=10049&#038;mkevt=1\" class=\"fu_ebay\" style=\"display:inline !important;\" rel=\"nofollow\" target=\"_blank\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/australianholden.com\/wp-content\/plugins\/fast-ebay-listings\/US\/Right_Now_108x45.gif?resize=108%2C45&#038;ssl=1\" style=\"border:0;display:block !important;\" width=\"108\" height=\"45\" alt=\"Right Now on eBay\"\/><\/a>&nbsp;Thermostat<\/h5>\nLoading&#8230;<\/div>\n<\/div>\n<script>\n<!--\nvar content_fu_ebay_3 = null;\nvar waitForDepends_fu_ebay_3 = setInterval(function () {\n  if (typeof jQuery !== \"undefined\") {\n  if (window.fu_is_bot_useragent !== undefined) {\n    clearInterval(waitForDepends_fu_ebay_3);\n    if (typeof jQuery.ajax == \"undefined\") {\n      console.log(\"Fast eBay Listings: jQuery.ajax missing. Are you using jQuery.Slim that doesn't include ajax? \");\n      return;\n    }\n    if (fu_is_bot_useragent) return;\n    content_fu_ebay_3 = jQuery(\"#fu_ebay_3\");\n    jQuery(document).ready(jQuery.ajax({\n      type : \"post\",\n      url : \"https:\/\/australianholden.com\/wp-admin\/admin-ajax.php\",\n      data : {\n        action : \"fu_ebay_load_search\",\nfuDisableAPICache : 0,\nfuTraceLogging : 0,\nebay_country : \"AU\",\nfu_ebay_customId : \"\",\nfu_ebay_widget : 0,\nfu_ebay_picwidth : 225,\nfu_ebay_arrangement : 0,\nfu_ebay_title : \"Thermostat\",\nfu_ebay_query : \"VY Commodore Thermostat\",\nfu_ebay_searchInDesc : 0,\nfu_ebay_searchLocation : \"Internationally\",\nfu_ebay_pickupPostcode : \"\",\nfu_ebay_pickupRadius : 0,\nfu_ebay_sort : \"BestMatch\",\nfu_ebay_categoryIds : \"6030\",\nfu_ebay_sellers : \"\",\nfu_ebay_sellerType : \"\",\nfu_ebay_buyingOptions : \"\",\nfu_ebay_conditionOptions : \"\",\nfu_ebay_minPrice : 0,\nfu_ebay_maxPrice : 0,\nfu_ebay_minBids : 0,\nfu_ebay_maxBids : 0,\nfu_cols : 4,\nfu_rows : 2,\nfu_slideshow : \"Manual\",\nfu_slides : 3,\nfu_slideId : 3,\n\n      },\n      success : function( response ) {\n        content_fu_ebay_3.html( response );\n      },\n      error: function(e) {\n        console.log(\"Fast eBay Listings: deferred loading error: \" + e);\n      }\n    }));\n  }}\n}, 10);\n\/\/-->\n<\/script>\n\n\n\n<h1 class=\"wp-block-heading\">6. Spark Plug and Ignition Issues<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Weak ignition reduces combustion efficiency.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Symptoms<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Misfires<\/li>\n\n\n\n<li>Poor acceleration<\/li>\n\n\n\n<li>Increased fuel consumption<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Causes<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Worn spark plugs<\/li>\n\n\n\n<li>Ignition coil degradation<\/li>\n<\/ul>\n\n\n<div id=\"fu_ebay_4\"><!-- Presentation: cols = 4, rows = 2, slideshow = Manual, slides = 3, slideId = 4 --><div class=\"fu_ebay_results_container \">\n<h5 class=\"fu_ebay_results_title\" style=\"display: block !important;\">\n<a name=\"fu_slidetop_4\"><\/a><a href=\"https:\/\/www.ebay.com.au\/?mkcid=1&#038;mkrid=705-53470-19255-0&#038;siteid=15&#038;campid=5339152561&#038;customid=5339151688&#038;toolid=10049&#038;mkevt=1\" class=\"fu_ebay\" style=\"display:inline !important;\" rel=\"nofollow\" target=\"_blank\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/australianholden.com\/wp-content\/plugins\/fast-ebay-listings\/US\/Right_Now_108x45.gif?resize=108%2C45&#038;ssl=1\" style=\"border:0;display:block !important;\" width=\"108\" height=\"45\" alt=\"Right Now on eBay\"\/><\/a>&nbsp;Spark Plugs<\/h5>\nLoading&#8230;<\/div>\n<\/div>\n<script>\n<!--\nvar content_fu_ebay_4 = null;\nvar waitForDepends_fu_ebay_4 = setInterval(function () {\n  if (typeof jQuery !== \"undefined\") {\n  if (window.fu_is_bot_useragent !== undefined) {\n    clearInterval(waitForDepends_fu_ebay_4);\n    if (typeof jQuery.ajax == \"undefined\") {\n      console.log(\"Fast eBay Listings: jQuery.ajax missing. Are you using jQuery.Slim that doesn't include ajax? \");\n      return;\n    }\n    if (fu_is_bot_useragent) return;\n    content_fu_ebay_4 = jQuery(\"#fu_ebay_4\");\n    jQuery(document).ready(jQuery.ajax({\n      type : \"post\",\n      url : \"https:\/\/australianholden.com\/wp-admin\/admin-ajax.php\",\n      data : {\n        action : \"fu_ebay_load_search\",\nfuDisableAPICache : 0,\nfuTraceLogging : 0,\nebay_country : \"AU\",\nfu_ebay_customId : \"\",\nfu_ebay_widget : 0,\nfu_ebay_picwidth : 225,\nfu_ebay_arrangement : 0,\nfu_ebay_title : \"Spark Plugs\",\nfu_ebay_query : \"VY Commodore Spark Plug\",\nfu_ebay_searchInDesc : 0,\nfu_ebay_searchLocation : \"Internationally\",\nfu_ebay_pickupPostcode : \"\",\nfu_ebay_pickupRadius : 0,\nfu_ebay_sort : \"BestMatch\",\nfu_ebay_categoryIds : \"6030\",\nfu_ebay_sellers : \"\",\nfu_ebay_sellerType : \"\",\nfu_ebay_buyingOptions : \"\",\nfu_ebay_conditionOptions : \"\",\nfu_ebay_minPrice : 0,\nfu_ebay_maxPrice : 0,\nfu_ebay_minBids : 0,\nfu_ebay_maxBids : 0,\nfu_cols : 4,\nfu_rows : 2,\nfu_slideshow : \"Manual\",\nfu_slides : 3,\nfu_slideId : 4,\n\n      },\n      success : function( response ) {\n        content_fu_ebay_4.html( response );\n      },\n      error: function(e) {\n        console.log(\"Fast eBay Listings: deferred loading error: \" + e);\n      }\n    }));\n  }}\n}, 10);\n\/\/-->\n<\/script>\n\n\n\n<h1 class=\"wp-block-heading\">7. Tyre and Alignment Problems<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Mechanical resistance increases fuel usage.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Symptoms<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Uneven tyre wear<\/li>\n\n\n\n<li>Vehicle pulling<\/li>\n\n\n\n<li>Heavy steering feel<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Causes<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Incorrect wheel alignment<\/li>\n\n\n\n<li>Underinflated tyres<\/li>\n<\/ul>\n\n\n\n<h1 class=\"wp-block-heading\">8. Transmission Problems<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">A slipping or poorly shifting transmission increases fuel consumption.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Symptoms<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>High RPM at cruising speed<\/li>\n\n\n\n<li>Slipping gears<\/li>\n\n\n\n<li>Harsh or delayed shifts<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Causes<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Worn transmission fluid<\/li>\n\n\n\n<li>Internal wear<\/li>\n<\/ul>\n\n\n\n<h1 class=\"wp-block-heading\">9. Oxygen Sensor Heater Failure<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Modern oxygen sensors use heaters to function correctly.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Symptoms<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Poor fuel economy when cold<\/li>\n\n\n\n<li>Check engine light<\/li>\n<\/ul>\n\n\n\n<h1 class=\"wp-block-heading\">10. Excessive Idling and Driving Style<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Driving habits significantly affect fuel usage.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Causes<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Heavy acceleration<\/li>\n\n\n\n<li>Long idling periods<\/li>\n\n\n\n<li>Short trips only<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">The VY Commodore performs best with steady driving conditions.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Engine Running Rich (Fuel Overuse)<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">A rich-running engine burns too much fuel.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Symptoms<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Black smoke<\/li>\n\n\n\n<li>Fuel smell<\/li>\n\n\n\n<li>Poor fuel economy<\/li>\n\n\n\n<li>Fouled spark plugs<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Causes<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Sensor faults<\/li>\n\n\n\n<li>Injector issues<\/li>\n\n\n\n<li>ECU misreading data<\/li>\n<\/ul>\n\n\n\n<h1 class=\"wp-block-heading\">Engine Running Lean (Less Common for Fuel Economy Issues)<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Lean conditions usually affect performance more than economy.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Symptoms<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Hesitation<\/li>\n\n\n\n<li>Poor throttle response<\/li>\n<\/ul>\n\n\n\n<h1 class=\"wp-block-heading\">How to Diagnose Fuel Economy Problems<\/h1>\n\n\n\n<h1 class=\"wp-block-heading\">Step 1: Scan for Fault Codes<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Check for:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Oxygen sensor faults<\/li>\n\n\n\n<li>Fuel trim issues<\/li>\n\n\n\n<li>MAF sensor errors<\/li>\n<\/ul>\n\n\n\n<h1 class=\"wp-block-heading\">Step 2: Inspect Air Intake System<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Look for:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Dirty air filter<\/li>\n\n\n\n<li>Vacuum leaks<\/li>\n\n\n\n<li>Intake restrictions<\/li>\n<\/ul>\n\n\n\n<h1 class=\"wp-block-heading\">Step 3: Check Fuel System<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Inspect:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Fuel pressure<\/li>\n\n\n\n<li>Injector condition<\/li>\n\n\n\n<li>Fuel pump performance<\/li>\n<\/ul>\n\n\n\n<h1 class=\"wp-block-heading\">Step 4: Inspect Tyres and Alignment<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Check:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Tyre pressure<\/li>\n\n\n\n<li>Alignment angles<\/li>\n\n\n\n<li>Rolling resistance<\/li>\n<\/ul>\n\n\n\n<h1 class=\"wp-block-heading\">Step 5: Monitor Fuel Trims<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Using a scan tool, check:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Short-term fuel trim<\/li>\n\n\n\n<li>Long-term fuel trim<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">High positive or negative values indicate issues.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Common Misdiagnoses<\/h1>\n\n\n\n<h1 class=\"wp-block-heading\">Faulty Sensors vs Mechanical Issues<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Many fuel economy problems are sensor-related rather than engine wear.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Transmission vs Engine Problems<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">High fuel usage may be caused by transmission slipping.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Tyre Drag vs Engine Efficiency<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Simple tyre issues are often overlooked.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">How to Improve Fuel Economy<\/h1>\n\n\n\n<h1 class=\"wp-block-heading\">Replace Worn Oxygen Sensors<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Restores proper fuel mixture control.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Clean MAF Sensor<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Improves airflow measurement accuracy.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Service Fuel Injectors<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Ensures correct fuel delivery.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Maintain Proper Tyre Pressure<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Reduces rolling resistance.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Regular Maintenance<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Includes:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Oil changes<\/li>\n\n\n\n<li>Air filter replacement<\/li>\n\n\n\n<li>Spark plug replacement<\/li>\n<\/ul>\n\n\n\n<h1 class=\"wp-block-heading\">Driving Habits<\/h1>\n\n\n\n<h3 class=\"wp-block-heading\">Best Practices<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Smooth acceleration<\/li>\n\n\n\n<li>Avoid excessive idling<\/li>\n\n\n\n<li>Maintain steady speeds<\/li>\n<\/ul>\n\n\n\n<h1 class=\"wp-block-heading\">Warning Signs Requiring Attention<\/h1>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Sudden drop in fuel economy<\/li>\n\n\n\n<li>Strong fuel smell<\/li>\n\n\n\n<li>Engine misfires<\/li>\n\n\n\n<li>Check engine light<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">These may indicate underlying mechanical or sensor faults.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Fuel economy issues in the VY Commodore are usually caused by a combination of ageing sensors, fuel system wear, and general maintenance neglect. In most cases, problems such as faulty oxygen sensors, dirty MAF sensors, or worn spark plugs are responsible rather than major engine failure.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">With proper diagnosis and routine maintenance, fuel consumption can often be significantly improved. Addressing small issues early is the key to maintaining efficiency and keeping running costs down.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Related Articles<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/australianholden.com\/index.php\/2026\/06\/08\/vy-vz-commodore-electrical-problems\/\" type=\"post\" id=\"7570\">VY Commodore Electrical Problems<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/australianholden.com\/index.php\/2026\/06\/08\/vy-vz-commodore-fuel-pump-problems\/\" type=\"post\" id=\"7576\">VY Commodore Fuel Pump Problems<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/australianholden.com\/index.php\/2026\/06\/08\/vy-vz-starting-problems-guide\/\" type=\"post\" id=\"7578\">VY Commodore Starting Problems Guide<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/australianholden.com\/index.php\/2026\/06\/09\/common-ecotec-engine-problems\/\" type=\"post\" id=\"7518\">Holden Ecotec Engine Problems<\/a><\/li>\n\n\n\n<li>Best Engine Oils for VY Commodore<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Poor fuel economy is a common complaint among VY Commodore owners, especially as these vehicles age and accumulate high kilometres. While the VY was reasonably efficient for its time, real-world fuel consumption can increase significantly due to mechanical wear, sensor issues, driving conditions, and maintenance problems. This guide explains the most common causes of poor [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":597,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[1],"tags":[],"class_list":["post-7582","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>VY Commodore Fuel Economy Problems - Australian 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