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Discussion Starter #1
Hello guys I have Nissan versa 2008 It shows the lean code p01071. I displayed the live data and the short fuel trim is 25. When I press on the fuel pedal the value of the SFT is increase slightly and when I release The value decrease to zero then it returns to 25. I disconnected the maf and i got -25 value . Please see the attached video of the live data. I would be so grateful if someone help me with this problem it is really stressing me.
 

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Most of the time that sort of thing is caused by a vacuum leak somewhere, look for disconnected or cracked hoses................
 

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Discussion Starter #4
leak

thank you guys for your suggestions. in fact it was difficult to figure it out. after i cleaned the intake manifold and I was sure it it's seal then I tried to run the car and my obdii displayed the same issue air to fuel in between 20 to 25 :1 and the engine is shaking and dying at the idle speed. again i confirmed when i press the fuel pedal the air to fuel ratio decreases and almost normal! so I was confident that there was a magical leak. I did replaced fuel pump and spark plagues but nothing happened again. Then I purchased carbon cleaner and sprayed it on the intake manifold and i noticed rpm increases plus on obdii ELM327 the air to fuel decreased! but the weird thing we already opened the intake manifold and placed the gasket very well! finally i took it to technician and he confirms my guess that there is a leak after that he opened the injectors and here is the magic! injectors rubber seals were bad and can't prevent air from leaking. problem solved after really bad time. thanks for your support.

regards,
 
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