All,
I have a 2006 Taurus with the 3.0L V6 Engine, autotrans. Lately (past few months) the gas mileage has dropped from about ~300 mi per tank to about ~200 mi per tank (it works out to be around 20mpg down to 13mpg) with no change in terrain, load or driving habits (just me). Also, the idle is uneven, not rough but surges up and down erratically. Occasionally I smell raw gas on hot start but that is not reproducable. Anyway, I took it in to Ford today to get the AC Fan fixed under warranty and ask that they check the engine.
They fixed the fan, road tested and checked the computer for trouble codes (none found), found no TSBs on this issue and patted me on the head and told me the uneven idle is normal when the AC kicks on and off. The fact that it does it even when the AC is not cycling did not sway them. (You can hear the compressor kick in so its pretty obvious when that happens). They ended with logical fallacy that "there is nothing wrong with your engine since the Check Engine light is not on" and left it at that.
I am happy to report that they atleast did not charge me for the engine diagnostic but I am somewhat disappointed in the passive attitude that nothing is wrong when clearly something is wrong. Any helpful hints here? Do I just wait (wasting gas and $$, all the while) until the computer finally thows a code? Anyone else experience something similar or might know of a failing component that would cause these symptoms without generating a code? TIA
Regards, David