Fuel Mixture Problem... - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars
General Tech Have a question that is not covered by one of the other categories? This is the forum for all other items not specifically covered in other categories.

LinkBack Thread Tools Display Modes
post #1 of 6 (permalink) Old 01-07-04, 12:54 AM Thread Starter
Registered User
Join Date: Jan 2004
Posts: 3
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!

kaiost is offline  
Sponsored Links
post #2 of 6 (permalink) Old 01-07-04, 01:36 AM
Registered User
TaraHymen's Avatar
Join Date: Aug 2003
Location: Perth, Western Australia
Posts: 354
Re: Fuel Mixture Problem...

do you know the exact fault codes the ecu generated?

TD Cortina ED XR6 Engine, T5, 9inch, Boyd billets, 4 wheel disc etc
AU XR6 - All the usual goodies not worth bragging about

See them both here <=-- Page Updated 15 October 2006
TaraHymen is offline  
post #3 of 6 (permalink) Old 01-10-04, 04:16 AM Thread Starter
Registered User
Join Date: Jan 2004
Posts: 3
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!
kaiost is offline  
post #4 of 6 (permalink) Old 01-10-04, 05:58 AM
Registered User
Join Date: Jun 2002
Posts: 262
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
I8AHSV is offline  
post #5 of 6 (permalink) Old 01-10-04, 08:08 AM
Join Date: Feb 2001
Location: Bibra Lake Western Australia
Posts: 3,302
Re: Fuel Mixture Problem...

Fuel Filter partially blocked?

Regards Blue
Aussiblue is online now  
post #6 of 6 (permalink) Old 01-10-04, 04:21 PM
Two SC 61's = trouble
ebxr8240's Avatar
Join Date: Jul 2001
Location: Penrith,nswAus/Morrinville.NZ
Age: 63
Posts: 6,360
Re: Fuel Mixture Problem...

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

Don't be afraid to try something new. Remember, amateurs built the Ark...Professionals built the Titanic!
Tuned & maintained by "Peppertree Perfmormance". Dart block, Scat 4340 steel crank, Custom C.P pistons.Oliver rods.. Mal Wood twin plate clutch.. Twin SC61/2's,482 rwkw/ 645 rwhp..
Passengers, myocardial infarction material..
R.I.P Possum...
ebxr8240 is offline  
Sponsored Links

  Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars > The Garage - Tech Forums > General Tech

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Similar Threads
Thread Thread Starter Forum Replies Last Post
92 Tempo Fuel Pump problem or How to test the fuel pump? Zyetta Ford Tempo Forum | Mercury Topaz Forum 1 01-05-04 09:51 PM
98 Windstar fuel related problem windstar2304 Ford Vans and Mini Vans | Ford Aerostar | Ford Freestar | Ford Galaxy | Ford Windstar 0 08-05-03 06:57 AM
Ford Product-Led Transformation: 2003 RPO83 Trans | Driveline 0 07-22-02 06:48 AM
Fuel problem PHIL82 Australian Falcons 16 05-19-02 04:13 PM
Ford's goal of boosting SUV fuel economy proves elusive Stacy94PGT Ford Worldwide News 0 04-19-02 07:47 AM

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome