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Old 04-05-2014
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Live data OBDII problem

Hello, I recently have been getting OBD codes p0171 and p0174(lean both banks) along with a few other vacuum related problems. I suspected that the cause is a faulty lower intake gasket. However, I wanted to explore the symptoms further before tearing into the engine so, I bought a OBDII tool with live data so that I could see fuel trim data. Here is the problem, all of the fuel trim parameters read -100% and never change. I have tried the scan tool on other vehicles and have no problems reading any live data parameter so the tool is working properly. I thought all 1996+ vehicles supported live data. am I wrong? Or is my computer doing something odd?
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Old 04-05-2014
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Btw, all other applicable live data parameters are displayed with no problems. Also, the vehicle runs reliably with no major issues.
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Old 04-05-2014
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Yes, that 100 on fuel trim is not uncommon on the early Ford OBD II, they didn't use standard OBD II protocol until, I think, 1998, might have been '99.

Yes, some of the other data will often work OK.


Also check PCV valve and hose for vacuum leak
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Old 04-06-2014
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Thanks, I was afraid of that. maybe a newer pcm or reprogram the current one to support fuel trim data if that is a possibility.
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