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Old 01-07-2005, 12:49 AM   #1
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Long Term Fuel Trim. ?? Help

Hey guys,

What is "long term Fuel Trim"? How does is apply to the focus? And why does my fuel trim run at 25% and not a normal number compared to standard focuses?

My car is not excessively modded. Yet i have still pulled a check engine light because of it.

any insight to the mattr would be great.


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Old 01-07-2005, 01:06 AM   #2
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Long Term Fuel trim could mean that your car is running too lean or too rich...if it runs at 25% it sounds like your engine isn't getting enough air. The only reason why I know this is cuz my old POS Probe had the same problem...turns out it was from a bad MAF.
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Old 01-07-2005, 08:35 AM   #3
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Long term fuel trim is what the computer decided to put your fuel map to over time.

Short term fuel trim is what the computer is doing right now to your fuel.
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Old 01-07-2005, 10:17 AM   #4
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I run an AEM short Ram. And while I was at my dealership working with tech in the service area. My dealership is the best around by the way. He checked seals, the maf, and a number of other things with some sort of spray while monitoring on a touchscreen OBD2 scanner. He didn't find anything that would make the trim do this.

But, I was working the other day and some one suggested that it might be the fuel injectors.

Anymore input into the subject would be greatly appreciated.
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Old 01-17-2005, 10:41 AM   #5
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Anyone, still looknig for some insights.
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Old 01-17-2005, 10:50 AM   #6
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come one, help a guy out.
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Old 01-20-2005, 01:37 PM   #7
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the tech is saying that it might the T/B for some reason.
Or he thinks it might be the new oxygenated fuel they are using this winter.

need some help
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Old 01-21-2005, 12:50 AM   #8
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anyone?
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Old 01-21-2005, 10:46 AM   #9
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well, I called my service guy and he said that the problem is a bad fuel injector.

hope thats it.
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Old 01-21-2005, 11:08 AM   #10
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Glad you got it figured out, hopefully.
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