Needed some info for 05 nissan quest 3.5L afr sensors there are 2 upstream afrs, what is the normal voltage range of them? than the 2 downstream o2 sensors are they used to fine tune the fuel control,or just to see the health of the cat? Its got 130,000 miles on it new dealer plugs in it,no mil light on with no pending codes, with long term fuel adding 8+ fuel it really seems like an vacuum leak, but ive smoked the engine no leaks plus carb sprayed it nothing. The car runs very good no missing at all but using way to much fuel. Would appreciate feedback thanks.
I believe it's 2v but I can verify that at work tomorrow.
You can look at the equivalency ratio pid. That one aims to be at 1.0v. More than that indicates a rich mixture and less is lean. The changes are smaller and faster than you normally see with an O2 though.
What are fuel trims at idle vs say 2k rpm? Do they get up or down?
The fuel trims get better with increase rpms just like i have an vacuum leak, im going to really smoke this engine tomorrow through the exhaust and intake again, the engine runs great, u dont even hear this car idling. It does have an split front mount im going to also check the bank 1 exhaust for any type of leak in the gasket,thats were the fuel is being added from that side. But yes please can u let me know about the voltage of these afr sensors tomorrow,thanks.
