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Old 01-07-2004, 00:54   #1 (permalink)
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Fuel Mixture Problem...

Hello all,

Am currently having a great deal of headache from my 2000 Ford Focus. I moved to Switzerland from the USA 6 months ago and brought the car along with me.

About one month ago when my wife started the car, it would not idle - meaning without gas it would stall right away. The ford mechanics here changed two parts (soupape de ralenti and senseur d'air - exaust recirculation sensor and O2 valve as far as I understood with my limited french). The car then ran for about 50 miles without problems, but then the following problem surfaced:

The check engine light comes on and the car idles roughly. After two more trips back to the garage in the last week, the computer diagnosis is always FUEL MIXTURE TOO POOR. The first visit the garage reset the onboard computer, yet the problem resurfaced after about 10 miles driving. They then replaced the O2 sensor, yet after 10 miles or so the same issue. The troubling issue is that they told me this morning they don't know what the problem is, and their only solution is to change piece by piece as recommended by the ford diagnostic computer until it runs without problems again. Even if this would normally be acceptable, car service in Switzerland is VERY expensive, so it's a very, very unpleasent prospect for me! So the question is, has anyone experienced a similar problem with this model? Any ideas? This Focus model has many problems with the fuel pump (We have already had to change it once about 1 year ago), could this be the culprit again? Any advise at all would be greatly appreciated!

Many thanks!
Kai
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Old 01-07-2004, 01:36   #2 (permalink)
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Re: Fuel Mixture Problem...

do you know the exact fault codes the ecu generated?
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Old 01-10-2004, 04:16   #3 (permalink)
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Re: Fuel Mixture Problem...

I went to the mechanic yesterday to check on the status... the fault code is as follows: PO171PCM
Again, any ideas would be greatly appreciated!
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Old 01-10-2004, 05:58   #4 (permalink)
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Re: Fuel Mixture Problem...

Check the following

Fuel Pressure
Fuel Injectors
Fuel Pump
Manifold Absolute Presure Sensor
Engine Coolant Sensor
Throttle Position Sensor

Also check for fuel leaks in the fuel lines & check for vacuum leaks
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Old 01-10-2004, 08:08   #5 (permalink)
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Re: Fuel Mixture Problem...

Fuel Filter partially blocked?
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Old 01-10-2004, 16:21   #6 (permalink)
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Re: Fuel Mixture Problem...

Yes check filter, pump & the sock filter that fits over pump. Check fuel pressure...Fuel reg also...IS Maf clean ???
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