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Old 03-25-2013, 11:54 AM   #1
hosscat
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2007 Ford Focus rough idle (vibration)

I bought a 07 ford focus se, 4-door a few months ago for my wife's commute to work. It ildes pretty rough, and has a vibration. But only at an idle, once you give it much gas it runs great. I changes the plugs over to AR 103's (or AR 104's can't remember) as suggested and it didn't change any noticable amount. Also her mpg is lower than I was expecting. She normally gets 29-30 mpg per tank and most of her driving is around 60 mph. Any suggestions?

Thanks,


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Old 03-25-2013, 11:57 AM   #2
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My 06 has rough idle as well , cant for the life of me find out why lol.

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Old 03-25-2013, 02:53 PM   #3
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rough like engine isn't running right? Or rough like vibrating a lot through the vehicle? If it's vibrating through the vehicle you need to check your motor mounts.
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Old 03-25-2013, 03:47 PM   #4
hosscat
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rough like vibrating, engine sounds fine. I will look at the motor mounts. Any ideas on the sub par mpg. I have thought about changing the fuel filter, the car has 100k and I don't know if its been changed or not.
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Old 03-25-2013, 03:56 PM   #5
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Clean the MAF?
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Old 03-25-2013, 07:23 PM   #6
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Moved to "General Technical Chat".
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Old 03-26-2013, 06:21 AM   #7
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Change the top passanger side engine mount. Very easy to do.




Quote:
Originally Posted by hosscat View Post
I bought a 07 ford focus se, 4-door a few months ago for my wife's commute to work. It ildes pretty rough, and has a vibration. But only at an idle, once you give it much gas it runs great. I changes the plugs over to AR 103's (or AR 104's can't remember) as suggested and it didn't change any noticable amount. Also her mpg is lower than I was expecting. She normally gets 29-30 mpg per tank and most of her driving is around 60 mph. Any suggestions?

Thanks,
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Old 03-26-2013, 01:04 PM   #8
richkopena
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Both my Focuses (2004 and 2007, at different times) had the same rough vibration at idle. I changed all three motor mounts on both and the roughness disappeared. Do a search on "motor mounts" and you will find this is a VERY common condition on Focus vehicles.

The consensus is that the passenger side mount with the hydraulic damper is teh biggest driver for the vibration, but on both my cars all three mounts were rpoken/distressed.

For clarification, there are three mounts:
- Passenger side hydaulic mount
- Drivers side mount under the battery
- Torque isolator (dogbone) at bottom rear of engine

The first two are pretty easy to change, requiring minor removal of parts for access and support of the engine/trans with a jack and wood. The rear dogbone is a little harder because you're working under the car. some pretty good DIYs are around if you search.

For both cars, after I changed all the mounts, it was like drivng a different car.

The other common advise you will see, if you search, is that you should get a Ford OEM replacement for the passenger hydraulic mount. Aftermatrket parts don't seem too last very long.

Rich
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Old 03-26-2013, 02:08 PM   #9
hosscat
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Can anyone tell me why the replacment motor mounts cost so much, the aftermarket passenger side is $120 bucks.
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Old 03-26-2013, 08:17 PM   #10
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2007 Ford Focus rough idle (vibration)

Just changed all three mounts on my 2007 SES. Below is a link to my how to guide complete with part numbers and prices. Total cost for all three OEM mounts were $166, total.

https://docs.google.com/file/d/0B9Zs.../preview?pli=1
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