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Old 12-11-2012, 03:28 PM   #1
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a few issues

Hate that my first post here has to do with asking for help, but every google search i've done for my wifes car has led me to this site.

I bought my wife a 2003 focus se a few weeks ago and everything ran fine the first night.... the next day i went to the car dealership to get a spare key entry. on the way there while driving on the freeway the car did a hard jerk like a pause or something. I thought i may have just fat foot the brake while driving. didnt think much of it. the next few days, it did the same thing while driving on the regular streets. almot like a hard jerk. I filled it up with gas and noticed about 220 miles to a full tank a few days later.

Next the car would turn off real quick at a stop light every now and then but would start up just fine and then i would notice that when it jerked or hesitated real quick while driving, the abs and brake lights would light up real quick as well. While I'm no mechanic, here are a few of the things i did on my own.

1. replaced fuel filter (dirty nasty )
2. replaced air filter (again nasty as hell)
3. spark plugs and wires
4. cleaned mass air flow sensor
5. cleaned throttle bottle

It passed inspection without any issues the other day as well and i ran my hand held on the computer and didnt pull any codes.

any help on this would really be appreciated.

thanks



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Old 12-11-2012, 03:50 PM   #2
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Which engine do you have?

Did you replace plugs and wires, or just check them?

Also, check the coil pack for cracks and check the connections.
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Old 12-11-2012, 03:55 PM   #3
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2003 Ford Focus 2.0L MFI SOHC SPI 4cyl

yup, replaced the wires and plugs. the only thing that didnt need changing was the oil.

ill check the coil pack as well.

thanks
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Old 12-11-2012, 03:55 PM   #4
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The connector that plugs into the coil is known to go bad too.

Get your fuel filter changed as well.
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Old 12-11-2012, 04:04 PM   #5
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i did change the fuel filter. it was pretty dirty.
if the coil was bad wouldnt it throw a check engine light?
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Old 12-11-2012, 04:11 PM   #6
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From another thread with a misfire prob:

Quote:
Originally Posted by amc49
Pull the coil and look at it carefully on the outer case in bright light. These commonly crack small cracks that can be just about anywhere on the coil case plastic. It is VERY common to misfire only in little bits on these, I've lost 4 now to it and not a one misfired 100% of the time, only very slight cutouts under load, they idled and low load/rpm beautifully. The cracks let moisture in to corrode wires, the miss will be very light at first. I never registered a single DTC during all fails. Look VERY close at the wiring going right into module too, common for wires to crack there at insulation to make same problem, they were too cheap and the wireloom there is too short, MAF sensor pulls loom the other way to crack wires at coil connector. You can buy the connector, I rebuilt one for mine for maybe $2.
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Old 12-30-2012, 03:15 PM   #7
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just wanted to give a quick update on this. after going thru everything, we finally found that it was a loose battery cable (positive) that was barely loose.
It was missing what looked like a cap that fits directly on top. I guess while driving, the cable would move just enough to loose power momentarily and cause the car to "jerk". The abs and brake lights would come on at that time as well. But since replacing the missing cap on the cable a week ago, its been running like a champ.

The only issue i seem to be having now is the poor fuel mileage we are getting. If i did my math correctly, i'm getting around 20 miles a gallon. (about 250ish miles on a full tank)

Like i said, the things that were replaced were the fuel filter, egr sensor and tube, plugs (motorcraft) and wires, air filter (stock) cleaned the maf.
Really dont know what else i could do with that, but i really appreciate the help some of the forum members were giving.

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Old 01-20-2013, 10:24 PM   #8
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Bad mileage

After I changed my plugs the first time, my mileage decreased. I found out the spark was leaking past the rubber boot on the spark plug wire where it connects to the spark plug. I was running on 3 cyl.. If you put a thin film of dielectric grease in the boot it will solve the problem.
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