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
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?