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Old 02-12-2013, 12:39 AM   #1
dingoqing
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Very poor mileage for my focus 2005 zxw AT

Bought my ford focus 2005 one months ago. ZXW automatic transmission, 78k.
I only got about 15mpg in town (average 25-40mph). The Air filter indicator still at green. Oil and filter changed at 75k miles. Spark changed two weeks ago.
Is it normal? What should I do.

One more thing, the steel wheel shakes greatly at 1000rpm, plan to chang driver side transmission mount.

Thanks.


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Old 02-12-2013, 05:15 AM   #2
whynotthinkwhynot
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Usually when we see low mileage like this it's due to bad math. People will hit the trip odometer, fill up the car, drive it until the fuel light comes on, fill up again, and then divide the mileage by 14- the fuel capacity of the tank. To properly gauge fuel economy, you do all that except you divide the trip odo mileage by the number of gallons used on the last fill-up. In this case you'll typically be dividing by 10.5 instead of 14 because most Focis have a massive reserve once the fuel light comes on.

The other 2 things you can do that might not have been done during the car's life are clean the MAF and replace the fuel filter. Fuel filters are often overlooked, but have a 20-30k mile or 1 year life span. I change my wife's van every year because she doesn't put 10k on it in a year. I change mine according to mileage.

To clean the MAF, it is located below where that air filter test gauge is and is the only thing with wires going into the air intake. You'll need a Torx 15 screwdriver unless you're lucky like me and it has both a torx and combo flat head screw. First slide the red holding clip back, then press the now expose center of the clip to unplug it. Use your screwdriver to remove the 2 screws holding the MAF in place. Remove the MAF, now use spray MAF cleaner from an auto parts store (do not use carb cleaner), and spray it in the small holes on the sides of the MAF. Shake, and re-install. Wait a few minutes for it to dry, and then start the engine.

Another part that might be going bad- but I think you'd notice a slight miss at idle- is the coil boots. As you've probably noted, you have COP ignition. There are no spark plug wires, but there is a rubber boot that connects the coil to the plug. Those are $5-8 each. To replace, remove the coil and boot, twist the boot to break it loose, now fold the end back towards the coil and slide the back side of the boot off the coil. You'll find a long spring with a solid core inside the boot. The new boots should come with this also. Check the coil prong where the spring connects for corrosion, clean, install new boot, re-install coil.

I have also noticed that the coil plug-in connectors tend can go bad over time, so before you release the clips- pull on the connectors. I had one that wouldn't clip in place unless I pulled the clip up. This caused a slight miss and lower fuel economy until I figured it out.

If none of this is helping, then we might need to go through some exhaust tests to see if your muffler is clogged.
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Old 02-13-2013, 06:03 PM   #3
dingoqing
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Thank you much.
But I still cannot find the MAF sensor, even after exhaustive search on google. Would you please give me some detail of its location. More details about how to uninstall it is appreciated.
Thank you
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