jimmy ... 11/15/2012

2008 GMC Sierra 1500 SLE 8Cyl5.3L - Engine

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How can I improve my fuel economy

Engine has active fuel management but almost never runs on4 cyl

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  Jimm 11/16/2012

  Here some simple suggestions;
  Check your fuel system, dirts creates poor combustion - means some of the mixture were not burned during combustion.
  
  Dirt inside fuel tank - clean it w/ fuel cleaner
  
  Clogged fuel lines - clean the lines
  
  Clogged fuel filter - replace filter
  
  Clogged fuel injectors - clean fuel injectors
  
  Dirty air filter - replace air filter
  
  Low tire pressure - check and fill to the recommended pressure
  
  Have the on-board diagnostic (OBD) system checked (scanned) for free - at any local auto parts store. Retrieve any stored codes that maybe not displayed.
  
  Post a reply with these above possibilities and any specific fault code(s) - for further assistance.
  
  Visit these parts sources; www.RockAuto.com or www.autopartswarehouse.com for parts as required.

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