Strong gas smell when starting

Jhill

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.

Jhill

Ok so I went and tested my own and I think I have to apologize for leading you down a wrong path. Apparently Nissans absolutely will not run with the mafs disconnected, mine wouldn’t even start. I even disconnected while running to simulate a signal loss, it will barely run with one but dies with two and then no start, guess your stranded if you lose maf on a z. I am tuned on ecutek but I doubt they would eliminate a limp mode that oem had. Guess I’ve learned something myself through this.