Further understanding your check engine light - Page 2 - Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum
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

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

Reply
 
Thread Tools Display Modes
Old 01-03-2014, 06:07 PM   #11
FoFoTi
Focus Enthusiast
 
FoFoTi's Avatar
 
Join Date: Jul 2013
Fan#: 119990
Location: Houston, TX
What I Drive: 2014 hatch

Posts: 291
Points 555, Level 11
Points: 555, Level: 11 Points: 555, Level: 11 Points: 555, Level: 11
Level Up 10% Completed
Level up: 10% Level up: 10% Level up: 10%
Forum Activity 1%
Activity: 1% Activity: 1% Activity: 1%
FF Reputation: 1 FoFoTi Good Standing Member
Buy-Sell-Trade Rating: (0)
LOTS of good info here. tnx !
__________________
2014 Titanium hatch, DCT, handling package, blue candy
FoFoTi is offline  
    Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 02-20-2014, 04:13 AM   #12
sailor
Crankshaft
 
sailor's Avatar
 
Join Date: Jun 2008
Fan#: 57268
Location: Williamsville, NY
What I Drive: 2004 Pitch Black ZTS 2.3 5spd.

Posts: 16,721
Points 11,959, Level 71
Points: 11,959, Level: 71 Points: 11,959, Level: 71 Points: 11,959, Level: 71
Level Up 78% Completed
Level up: 78% Level up: 78% Level up: 78%
Forum Activity 99%
Activity: 99% Activity: 99% Activity: 99%
FF Reputation: 79 sailor Excellent Standing Member
Buy-Sell-Trade Rating: (0)
Systems description & malfunction indication parameters - Invaluable!

Describes how the systems work & when & how they're tested. If you know what they're SUPPOSED to do, it's easier to figure problems when they don't.

Good reading & reference.
__________________
"Rubber Side Down"

S.R. #275
sailor is online now  
    Reply With Quote Quick reply to this message
Old 05-02-2014, 12:16 AM   #13
harbt95
Focus Enthusiast
 
harbt95's Avatar
 
Join Date: May 2014
Fan#: 160098
Location: Keeseville, NY
What I Drive: 2003 ford zx2 zetec silver

Posts: 327
Points 1,181, Level 18
Points: 1,181, Level: 18 Points: 1,181, Level: 18 Points: 1,181, Level: 18
Level Up 81% Completed
Level up: 81% Level up: 81% Level up: 81%
Forum Activity 2%
Activity: 2% Activity: 2% Activity: 2%
FF Reputation: 1 harbt95 Good Standing Member
Buy-Sell-Trade Rating: (0)
Really good read. Learned a few things that I never understood about egr systems on the older ford rangers.
__________________
using FF Mobile
harbt95 is offline  
    Reply With Quote Quick reply to this message
Old 06-06-2014, 07:40 AM   #14
Bills86e
Focus Enthusiast
 
Bills86e's Avatar
 
Join Date: Sep 2013
Fan#: 119322
Location: pinellas park, FL
What I Drive: 2000 green SE, 2007 Kappa Speedster

Posts: 214
Points 398, Level 7
Points: 398, Level: 7 Points: 398, Level: 7 Points: 398, Level: 7
Level Up 96% Completed
Level up: 96% Level up: 96% Level up: 96%
Forum Activity 0%
Activity: 0% Activity: 0% Activity: 0%
FF Reputation: 1 Bills86e Good Standing Member
Buy-Sell-Trade Rating: (0)
CHECK ENGINE LIGHT

automotive stoichiometry

A mixture is the working point that modern engine management systems employing fuel
injection attempt to achieve in light load cruise situations. For gasoline fuel, the
stoichiometric air/fuel mixture is approximately 14.7 times the mass of air to fuel.
Any mixture less than 14.7 to 1 is considered to be a rich mixture, any more than
14.7 to 1 is a lean mixture - given perfect (ideal) "test" fuel (gasoline consisting
of solely n-heptane and iso-octane).

As engine components age, parts-gaskets-seals deteriorate, intake,exhaust, sensors, ect.
The Brain - ECM compensates if you have a vacumn leak by adding more fuel,as the O2 reports
a lean condition. If an injector is stuck open the engine runs rich, and the ECM compensates
by restricting the injector electrical pulses that open its pintols. When these factors get
out of the range of compensation, the ECM sends out a check engine light signal.

Heres good reading:
http://www.youtube.com/watch?v=5WnM_NsOtd8
http://www.youtube.com/watch?v=cARQ0jZZ4Qc
Bills86e is offline  
    Reply With Quote Quick reply to this message
Reply

Bookmarks & Social Networks

Quick Reply
Message:
Options

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.



Thread Tools
Display Modes

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

Forum Jump


All times are GMT -5. The time now is 03:18 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