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  #1  
Old 10-09-2010, 07:58 AM
merzracer33 merzracer33 is offline
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2001 Sentra
 
Join Date: Jun 2010
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Default The infamous P0171 code

OK so i bought my sentra in june. It popped a p0171 code...bank 1 lean. It ran fine for a few weeks. Then it would buck and have hesitation at random times while driving. I put some seafoam in it and cleaned the MAF and that fixed that problem. Now its 4 months later and it runs perfectly fine while warm but stalls and hesitates when the engine is cold. So i figured an o2 sensor. I replaced the sensor and still stalls when cold. I know this problem has been posted many times but no one can narrow it down to one thing. I would figure if it needed a new MAF, it would pop a p0174 code as well.
Any help is appreciated.
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Old 10-09-2010, 07:50 PM
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NissanTech NissanTech is offline
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2004 Xterra
 
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Unfortunately it's very likely that the problem is the MAF sensor. Since the problem only happens in the morning, before replacing the sensor, try adjusting the engine idle.
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  #3  
Old 10-10-2010, 05:01 AM
merzracer33 merzracer33 is offline
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and if i adjust the idle up and it fixes the problem is it the MAF sensor?
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