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04-05-2005, 02:35 PM
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CC Member
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Join Date: Oct 2004
Cobra Make, Engine:
Posts: 22
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What's the purpose of teh fuel trim readings?
Anybody know?
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04-06-2005, 09:55 AM
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Cobra Make, Engine:
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Anyone...?
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04-06-2005, 10:18 AM
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Member of the north
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Join Date: May 2003
Cobra Make, Engine: A Cobra
Posts: 11,207
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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.
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I'm a writer, feed the artist and buy a book.
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04-06-2005, 11:49 AM
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"teh" is the.
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04-06-2005, 12:52 PM
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Cobra Make, Engine:
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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.
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So what do it's readings indicate? |
04-06-2005, 02:49 PM
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CC Member
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Join Date: Jun 2003
Location: Modesto,
CA
Cobra Make, Engine: Heritage body, built the rest..460 Toploader..9"
Posts: 165
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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.
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6year Heritage A&F
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1969 Hurst SC/Rambler(only 1,512 made) in the middle of restoration.
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04-06-2005, 02:56 PM
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289 FIA Fan
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Join Date: Mar 2000
Location: Dallas,
TX
Cobra Make, Engine:
Posts: 462
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69 Hurst Rambler
John,
Would you post some pictures of you Rambler restoration in your Member Gallery?
Thanks
thorin  |
04-06-2005, 03:16 PM
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CC Member
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Join Date: May 2001
Location: California,
Ca
Cobra Make, Engine: NAF 289 Slabside Early Comp Car with 289 Webers and all the goodies. Cancelling the efforts of several Priuses
Posts: 6,592
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Not Ranked
Fuel trim can be controlled with your right foot.
Rick
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Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
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04-06-2005, 06:12 PM
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Senior Club Cobra Member
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Join Date: May 2001
Cobra Make, Engine: A CSX Cobra,1966 GT350 and an '06 Ford Heritage GT
Posts: 1,829
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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.
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04-06-2005, 10:02 PM
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CC Member
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Join Date: Jun 2003
Location: Modesto,
CA
Cobra Make, Engine: Heritage body, built the rest..460 Toploader..9"
Posts: 165
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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.
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6year Heritage A&F
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1969 Hurst SC/Rambler(only 1,512 made) in the middle of restoration.
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04-06-2005, 10:04 PM
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CC Member
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Join Date: Jun 2003
Location: Modesto,
CA
Cobra Make, Engine: Heritage body, built the rest..460 Toploader..9"
Posts: 165
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Not Ranked
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
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6year Heritage A&F
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1969 Hurst SC/Rambler(only 1,512 made) in the middle of restoration.
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