Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum - Reply to Topic
Ford Focus Forum
HomeContact UsAbout UsGalleryDiscussion ForumsMarketplace


Go Back   Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum > Ford Focus Tech Discussions > General Technical Chat > P0171 Help

General Technical Chat This section is for technical discussions relating to general maintenance, electrical issues, engine trouble, and recalls.

Search This Forum | Image Search | Advanced Search    
Ford Focus Tire & Wheels FocusFanatics Merchandise

Thread: P0171 Help Reply to Thread
Title:
  
Message:
Post Icons
You may choose an icon for your message from the following list:
 

Register Now

In order to be able to post messages on the Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Additional Options
Miscellaneous Options

Topic Review (Newest First)
10-08-2012 06:24 PM
K_Weeve Thanks all for your help. It was the PCV hose. I noticed that it was extremely close to the block, so I took an extra piece of hose and wrapped it around the PCV hose to help protect it from the heat. Only problem I ran into was I broke a nipple off the intake manifold. I tried to get one at a junk yard, but ended up drilling it out and using epoxy to glue some tubing in its place. Fixed on a budget ;P
Thanks again everyone.
Ken
10-03-2012 03:38 PM
K_Weeve Thanks zx003. Thats what I was going to check next. Funny thing that you mention the rpm. I have the same issue. I wasn't sure if it was something I didn't notice before because it is my wife's car and I don't drive it too much. Sound like we've got it pinpointed. I'll be addressing it on the weekend. I'll let you know what I find.
10-02-2012 04:03 PM
zx003 I solved my P0171 issue by replacing the PCV hose. Try that first. It's not expensive and easy to do. It also solved my floating rpm (not the hanging one), meaning, when you rev the engine to 2.5k, it stays there for a second or two until it goes down.... to a hanging rpm where it stays at 1.5k, then another second or two to go down to regular idle.

09-30-2012 10:12 PM
K_Weeve Thanks BC. I suspected that there was something hidden behind the intake. I'll likely have to wait until next weekend to take a look at this again, but thanks for the insight.
09-30-2012 08:29 PM
BC_ZX3 P0171s are usually a lean condition caused by a vacuum leak of some sort after the MAF. On the Duratec motor, the PCV line is particularly difficult to inspect and replace, iirc. There is a thread on FF with pictures. Edit: thread here

DTC definition from Ford:

P0171 - System too lean (Bank 1) The Adaptive Fuel Strategy continuously monitors fuel delivery hardware. The test fails when the adaptive fuel tables reach a rich calibrated limit.

For lean and rich DTCs:

Fuel system:
Excessive fuel pressure.
Leaking/contaminated fuel injectors.
Leaking fuel pressure regulator.
Low fuel pressure or running out of fuel.
Vapor recovery system.

Induction system:
Air leaks after the MAF.
Vacuum Leaks.
PCV system.
Improperly seated engine oil dipstick.

EGR system:
Leaking gasket.
Stuck EGR valve.
Leaking diaphragm or EVR.

Base Engine:
Oil overfill.
Cam timing.
Cylinder compression.
Exhaust leaks before or near the HO2Ss.

A SHRTFT-1,2 PID value between -25% to +35% and a LONGFT-1,2 PID value between -35% to +35% is acceptable. Reading beyond these values indicate a failure.
09-30-2012 05:18 PM
stromberg2 Hope somebody knows because my svt acts up, too.

Stromberg2
09-30-2012 11:37 AM
K_Weeve
P0171 Help

Hey guys and gals. I've got a P0171 code from my 2006 2.0l ZX4. It will occassionaly run rough and loop when idling. Once I give it some gas, it runs fine. I've tried looking for a vacuum leak visually and with the carb cleaner trick with no luck. After searching the net, I came across an post about the IAC valve and thought it might be it. I took it off and cleaned it (even though it wasn't really dirty), but it didn't fix it. I played with it some more and noticed that while it was running rough, I could unplug the IAC and the car started running fine. Plug it back in and a second or 2 later it acted up again. I replaced it but still have the problem. Where should I look next?

Posting Rules
You may post new threads
You may 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


All times are GMT -5. The time now is 04:28 PM.


Copyright 2002-2014 FocusFanatics.com. All Rights Reserved : Privacy Policy : Advertise Information

Focus Fanatics Ford Focus Forum offers many fun ways for you to engage with other Ford Focus Owners from across the world. Whether it be about the aftermarket performance modifications, technical how-to's, European tuned suspension or awesome fuel economy similar to the Audi S3, Ford Fusion and Acura TLX. You can find all Ford Focus and Focus ST related information here. Join our Ford Focus discussion forums and chat with local Focus enthusiasts in your area. Challenger Hellcat - Charger Hellcat