2005 Frontier NISMO 4X4
Join Date: May 2010
Location: Sugar Land, Texas
how have you check for vacuum leaks? only bad ones will show with spraying and checking for a stumble. I always use a scanner that reads STFT, and LTFT(short and long term fuel trims.) if your LTFT are a high positive its adding fuel for a constant vacuum leak(or what it thinks is one due to a MAFS fault or 02. most often it is not a 02 but leak or MAFS. You need to erase the LTFT or it can mask a repair and make you think youve not fixed a issue because it will ALWAYS run under preconcieved faults that it will not correct before throwing codes or creating additional fault. DO this by doing a hard reset that clears all volatile memory from all modules. Disconnect battery negative cable and touch the disconnected neg cable to the positive. this discharges all capacitors on the truck/car and erases volatile memory(erasble memory like LTFT) It will be at "0" then. Now flip over to monitor bank 1 STFT and spray suspect areas again. When the STFT go into negative you found a vacuum leak(its puulling fuel from injectors because you induced fuel source through vacuum leak) This will let you see what the ECU sees through the 02 and is way more accurate than you spraying and trying to feel a stumble. IF there is no change then yes you can swap upstream 02's and see it the fault follows the 02. past that I too would replace the MAFS
4.56 gears,OMF street-locked Nismo wheels Shrock skids, PRG arms. BFG KM2 305/70/16, owner built engine, N fabbed Ken Bell Super Charger setup 337 RWHP, UPREV
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