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SN95 Cobras
Troublesome Trouble Codes... P0171
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<blockquote data-quote="mwolson" data-source="post: 6258631" data-attributes="member: 16006"><p>I just noticed this this thread, and am throwing the same codes, but I know what is causing it in my case. My MAF transfer function is not properly calibrated. These codes are thrown when the PCM learning needed to keep the engine running at stoich in closed loop exceed a pre-programmed threshold, and the cause is often a wacked MAF transfer function in a tune.</p><p></p><p>The evidence that your car has been tuned is there due to the fan turn-on temps. Also, without the cats, you should throw a code, unless the rear O2 sensors were turned off in a tune. And you said something about nitrous...</p><p></p><p>If you can find anyone to stick an Xcal2 or equivalent on it, have them log your long and short term fuel trims. I think you will find them way off. If that is the case, you will need a new tune.</p><p></p><p>If it is, in fact, a stock tune, you should try a known good stock MAF sensor if you can.</p><p></p><p>As for my car, I also know that my PLX M300 WB has a very old O2 sensor in it, and I need to get time to get it replaced because I am also getting a fuel trim difference from bank to bank. I am using the NB output from the M300 to simulate the stock NB on the driver's side. Once I get that fixed, I just need to recalibrate the MAF transfer function. Fortunately I have the SCT PRP so I can do it myself. I am afraid you are going to need a tune...</p></blockquote><p></p>
[QUOTE="mwolson, post: 6258631, member: 16006"] I just noticed this this thread, and am throwing the same codes, but I know what is causing it in my case. My MAF transfer function is not properly calibrated. These codes are thrown when the PCM learning needed to keep the engine running at stoich in closed loop exceed a pre-programmed threshold, and the cause is often a wacked MAF transfer function in a tune. The evidence that your car has been tuned is there due to the fan turn-on temps. Also, without the cats, you should throw a code, unless the rear O2 sensors were turned off in a tune. And you said something about nitrous... If you can find anyone to stick an Xcal2 or equivalent on it, have them log your long and short term fuel trims. I think you will find them way off. If that is the case, you will need a new tune. If it is, in fact, a stock tune, you should try a known good stock MAF sensor if you can. As for my car, I also know that my PLX M300 WB has a very old O2 sensor in it, and I need to get time to get it replaced because I am also getting a fuel trim difference from bank to bank. I am using the NB output from the M300 to simulate the stock NB on the driver's side. Once I get that fixed, I just need to recalibrate the MAF transfer function. Fortunately I have the SCT PRP so I can do it myself. I am afraid you are going to need a tune... [/QUOTE]
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Troublesome Trouble Codes... P0171
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