Hi. I am having the same problem. We recently acquired a 2005 Taurus SE Sedan, automatic. First thing i did was take it to the mechanic for a top to bottom inspection.
Brakes were worked on, all new tires, tune up, new fuel filter, air filter, elecrical, and more.
The car runs great and has a lot of power.
My primary issue is that I too, am getting terrible mileage (MPG). I've tracked 2 tanks of gas now and what i'm finding is that my TRUE MPG does match what the display tells me i'm averaging.
I'm averaging 11.2 - 11.9 MPG/City. I do not know about hightway for the car was on the highway only 1 time, during each tank.
My old 95 Corolla, which this car is replacing, on a BAD WEEK got 21 mpg and on a good week 24..
I read here that some were suggesting updating the onboard computer with the lastest software/firmware.
I don't know if this has ever been done to the car. I also don't know how "new" the new update would be. Meaning, is Ford even doing software updates on 2005 vehicles anymore?
I did call my local dealer to ask their thoughts and unfortunately the gentleman in the service department said he had no clue, just that 11.9 is not right.
I asked if flashing the computer would help, and his reply was, "Well, we charge $xxx/hr so you can try it if you want."
Really? That's it?
I told him all the work that was done to the car and said my mechanic is now out of ideas short of randomly replacing parts/sensors/other, "just to see".
My car has only 77,000 miles.
I have 3 other things going on with this car, one of which may be related. Maybe? Thoughts???
One thing which happened from day one is, if you get into a cold car and turn the ignition key immediatly all the way to start the car, sometimes it will not start on the first try. What has worked, 100% of the time is turning the key 1/2 way, waiting 5 seconds for all the guages to come alive, and then turning the key the rest of the way and starting the car.
Some have suggested that the fuel pump needs to "pressurize" and that's why giving that 5 second delay works, but my mechanic checked it out and says it's functioning correctly. So he recommended changing the fuel filter and doing one of those engine clean out system flushes where they put the stuff in, run the car, etc. None of it helped.
Where this becomes an issue is that i just had remote start added and it can not be programmed to give a 5 second delay prior to turning over the engine.
Since the "thought" is that this is related to gas... and i'm getting horrible MPG... could these things somehow be related? I think it's a stretch for the only thing in common, that i'm aware of... is both a related to gas, in some way.
Any thoughts on this????
The other 2 things which are strange are below. I"m hoping it's ok to post here, in this thread vs. creating a new ones. IF not, let me know and i'll pull it out.
Sometimes, for no apparent reason, when you open the driver door and then close it, it bounces right back open. It's not "latching". You can try closing the door 20 more times and every time, it bounces right open. If i touch the latch on the side of the door the door will now close (usually) and latch. This is random and happens maybe once a month. So, it's random and horribly frustrating when it happens.
Lastly, when parking the car and actually putting it into PARK, the car lunches forward a few inches. It happens nearly every time and i don't know why. It's kinda dangerous, i think.
Any thoughts on these things too?
I do like the car. It's a much smoother ride than my old Corolla and it has lots of power which i like. The MPG though is totally unacceptable considering gas is going to go to $4/gallon, if not $5. This car has another 8 good years left, maybe 10 the way I drive.
Thanks again for allowing me to post here. I know the last post on this thread was 3 years ago, so i'm hoping it's still active.
Corolla has power? Wow!
Be cautious with mileage. If you weigh 400lbs, it's no wonder why your mileage sucks. No offense, but if you were 150lbs, you'll get better mileage....
Now, you mention you had a tune up done, new tires, and so on. Aggressively treaded tires can reduce fuel economy as well, but not so much in the city.
The winter weather no doubt drops mileage some as well. Winter blended fuels contain slightly higher amounts of ethanol than during the summer. The higher the ethanol content, the greater the fuel use.
In winter, I get 14-16mpg with my '99 Taurus. I don't let it warm up long, a few minutes for the engine rpm to drop some before I get underway. If you let your car idle for prolonged periods, it really does eat into the overall mileage you will get.
In terms of the drivers door, you might be best to remove the inside panel, and grease what parts you can. I know with my older Dodge, some parts in my tailgate rust over if not oiled thus the latch remains closed when I try to close the hatch and it bounces back open. I haven't damaged the latch, but if the latch is closed when you attempt to close the door, you can cause more harm than good. If you are unsure, once you open the door, get in, and unlock the door before you close it. If doing that helps, then grease away! Also make sure that the lock on the door, and the pin on the B pillar of the car that goes into the door lock are aligned properly. DO NOT use the doors as a leverage point to get in/out of the car! - ANY car!
In terms of the transmission lurching. This can be caused a few ways. The more common one is a misaligned TV cable. The cable goes from the shifter to the side of the transmission and allows you to change gears. If there is play the park pawl might not be catching as it should, thus is why the vehicle is lurching. Also, when you change gears from moving to PARK, be sure the car is 110% stopped as it adds strain to the transmission. It's a mistake I remind my mother of to this day. I suppose some things cannot be taught to some people...
$5/gal gas is nothing to worry yourself with. My durango gets 9mpg here in the cold months and regular unleaded is nearly $6/gal equivalent for a US gallon, in US dollars here in Ontario Canada.
If you really wanted to go all out. A few things you can do to the car in terms of increasing mileage, is to remove any items that are in the car that you never use. Extra weight drains fuel economy, as I mentioned above. In a V6 sedan for every 100lbs you remove, you'll gain about 1mpg.
Also, if you have the 4V engine (200hp Duratec), that engine thrives more on the highway as it's peak torque is higher in the rpm band. The 145hp Vulcan engine (2V) has a much lower torque peak, which aids in city mileage. However, the Vulcan cannot best the Duratec on the highway in either mileage or overall performance. This is one of the reasons that made the Taurus a great car. You can have it in two totally different flavours.
It won't hurt to go to a Ford dealer and have them search your VIN for any technical service bulletin updates, such as a computer flash, and unperformed warranty work, etc.