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Old 02-21-2010, 04:04 PM   #1
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2000 Ford Focus engine vibration with P0171 code?

I have 2000 Ford focus ZTS model with ~110000 mileage (DOHC engine). One month ago the car had a problem of Engine vibration. I went to garage and the guy told me to replace the timing belt. After that It seems the vibration problem is solved.

However, after two weeks engine light was on with an OBD-II code P0171. I replaced a mass air flow sensor and reset the code. After one day the light was on again. I was trying to locate the problem and replaced two oxygen sensors located before and after the catalytic converter. After a couple of days the engine light is still on again, and meanwhile the problem of engine vibration also occurs.

Right now I have no idea how to solve the above problems. Any idea, many thanks!


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Old 10-29-2013, 07:15 PM   #2
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Hi
I have exactly the same problem on Focus 2000 SPI. Engine vibrates a lot when cold, after 5-6 minutes the vibration reduces to almost half and if I restart thye engine vibration almost gone. I am having code P0171. After I reset twice it come back again. Any help will be very much appreciated.
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Old 11-06-2013, 11:46 PM   #3
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It's running lean you need to check for vacuum leaks
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Old 11-08-2013, 08:58 PM   #4
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Motor mounts

I actually would think that it is more likely your motor mounts
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Old 11-08-2013, 10:31 PM   #5
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I agree, you should check your engine mounts for the vibration. The lean code is probably due to a vacuum leak. Checking for the right fuel pressure would be a good idea too.
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Old 11-16-2013, 03:39 PM   #6
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Rough idle with P0171 code !

My 2005 Wagon had the same issues. It was the PVC connector hose.
It had a split in it that you couldn't see until I pulled the manifold away from
the head. Real bitch is, Ford dealer wanted $45 for the thing. BUT IT'S FIXED!
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Old 11-16-2013, 06:08 PM   #7
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I think that's a code for running lean. Most likely a vacuum leak
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Old 11-24-2013, 07:13 PM   #8
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I already replaced the PCV elbow few months back. It collapsed and had a hole. It was very rough when idle but when changed the PCV elbow and now the problem gone. BTW I also changed the passenger side engine mount (Hydraulic one) and the engine vibration is gone as well.
But still have the P0171 code. I don't see any leakage, but some time when I'm idling 1-2 minutes the engine almost stalls and then comes back. But it happens only once or twice in last 1 month of drive. I have a small leak at the EGR connection to the exhaust manifold which I sealed with high temperature putty and now leak is very small. There may be P0171 code for his leak but the engine should not stall in long ideal for this. I would really appreciate your suggestion. It is very hard to detect where the problem is!
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