Author	[Modern View]
VernMI 01-25-2013 05:56:54 209.86.226.57 Report to Moderator	Start with Dignostic Trouble Codes (DTC's) to see if there are any obvious problems. The engine compartment should be checked to see if there are any hoses that have cracks in them or have fallen off of their connections including all of the tubes that connect to the intake air plenum. The next classic problem areas are thermmostat stuck partially open so it never heats up and also a partially plugged exhaust. Moving on from there I would begin to suspect oxygen sensors and misfiring due to spark plug or coil issues. After that MAF, TPS, MAP and other sensors would be suspect. Has the vehicle had an air cleaner changed and oil and filter changed recently? Are all the intake air systems intact and factory original? [Reply]   [No Email]
Brian G. NY 01-26-2013 12:07:19 64.246.141.101 Report to Moderator	Re: car fuel mileage in reply to VernMI, 01-25-2013 05:56:54   Vern mentions a stuck thermostat. I never realized what a difference that makes until the thermostat went bad in the wife"s Explorer. Mileage dropped off 3-4 MPG in the dead of winter. New thermostat and it went right back to normal. Heater worked a lot better too!! LOL [Reply]  [No Email]