-
Shop Talk
(
http://www.clubcobra.com/forums/shop-talk/)
| NoGood |
04-05-2005 03:35 PM |
What's the purpose of teh fuel trim readings?
Anybody know?
|
| NoGood |
04-06-2005 10:55 AM |
Anyone...?
|
| trularin |
04-06-2005 11:18 AM |
Don't know what teh is, but fuel trim is a term used to describe the ECM's ability to maintain a Stoichiometric condition in the engine.
|
| NoGood |
04-06-2005 12:49 PM |
"teh" is the.
|
| NoGood |
04-06-2005 01:52 PM |
Quote:
Originally posted by trularin
Don't know what teh is, but fuel trim is a term used to describe the ECM's ability to maintain a Stoichiometric condition in the engine.
|
So what do it's readings indicate? |
| John S Peterson |
04-06-2005 03:49 PM |
Fuel trim in numbers is the addition or subtraction of fuel as required to maintain as close to 14.7:1 as possible. You have both short term and long term corrections that will allow the cat to work as efficiently as possible. OBD II's only job in a nut shell is to protect the CAT so in a sense every OBD II vehicle has it's own 5 gas analyzer on board. Pretty cool if you think about it.
|
| Thorin |
04-06-2005 03:56 PM |
69 Hurst Rambler
John,
Would you post some pictures of you Rambler restoration in your Member Gallery?
Thanks
thorin:D
|
| Rick Parker |
04-06-2005 04:16 PM |
Fuel trim can be controlled with your right foot.
**)
Rick
|
| 427sharpe |
04-06-2005 07:12 PM |
Fuel trim is the reading thru the pcm/ecm for the % of air-to-fuel. In diag terms, it can tell you if the O2 sensors are working, and if they are 'lazy', which can cause driveability problems and trigger a mil. Can also help find contaminated MAF, dirty intake, leaking injectors or a ecm fault.
|
| John S Peterson |
04-06-2005 11:02 PM |
If you had an air fuel sensor (wide band) you could use Lambda calculations to really tell what was going on with AFR, but unfortunately very few vehicles at this time other than european vehicles use them. OBD II uses an O2 sensor monitor that checks response time as well as checking the heater circuit which will trigger the MIL. Any fuel trim numbers out of the norm for any length of time will usually turn the MIL on and if emissions exceed 1.5 times the Federal Test Procedure the light will flash indicating extreem danger to the CAT. If anyone is interested I have a lambda calculator that you can just plug your 4 or 5 gas readings into to get what your REAL AFR is, this is great for tuning you just have to have your gas readings to use it.
|
| John S Peterson |
04-06-2005 11:04 PM |
Thorin....I will get some pics together...it's been an interesting project so far and right now I'm just about finished with the body work, so now the fun begins
John
|
| All times are GMT -7. The time now is 12:02 AM. |
|
Powered by vBulletin® Version 3.8.0
Copyright ©2000 - 2025, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO 3.6.0
The representations expressed are the representations and opinions of the clubcobra.com forum members and do not necessarily reflect the opinions and viewpoints of the site owners, moderators, Shelby American, any other replica manufacturer, Ford Motor Company. This website has been planned and developed by clubcobra.com and its forum members and should not be construed as being endorsed by Ford Motor Company, or Shelby American or any other manufacturer unless expressly noted by that entity. "Cobra" and the Cobra logo are registered trademarks for Ford Motor Co., Inc. clubcobra.com forum members agree not to post any copyrighted material unless the copyrighted material is owned by you. Although we do not and cannot review the messages posted and are not responsible for the content of any of these messages, we reserve the right to delete any message for any reason whatsoever. You remain solely responsible for the content of your messages, and you agree to indemnify and hold us harmless with respect to any claim based upon transmission of your message(s). Thank you for visiting clubcobra.com. For full policy documentation refer to the following link:
