10-18-2017, 10:44 PM
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#22 (permalink)
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Track Member
Join Date: Mar 2016
Location: San jose
Posts: 854
Drives: 2013 370z sport
Rep Power: 3385
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Quote:
Originally Posted by Z_ealot
also forgot to note that one other thing I noticed is that both banks AF sensors were recording a 0 voltage while the mafs were unplugged
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Well it won’t have a load calculation because it gets that through the mafs. Without any load calc it will run like alpha n (rpm&tps) and use a map they know will run from internal testing. This will typically error rich and probably reduced timing (not an ideal running but something that is ensured to run). Again have not tested on Nissan to know if they just go to a total limp mode but others makes that I have disconnected mafs and driven for testing none come to mind that will go to a complete limp mode, in the past it was a good way to know if the maf was bad if it ran better without (although it could also mask a minor vacuum leak). So with yours disconnected your stft is pegged -25 and your AF’s are still indicating a rich condition. I’m not surprised it’s rich as I would suspect it to error rich but I’m a little confused by the stft. This may all be normal for Nissan, maybe with no load calc they just dump fuel and then the AF max rich causing the stft to peg -, I’ll have to see what mine dose.
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