This is for my Lexus but the motor is basically the same so I’m imploring you knowledgeable MUD guys for help on this one.
I used to have a bunch of vacuum leaks (positive fuel trim). I fixed all of those and the engine was happy for a few months with fuel trims sitting perfectly at 0 give or take 2%. Fuel economy was pretty good for a V8.
Lately my fuel economy sucks, my fuel trims are way rich (-26 to -32 on both banks). Replaced the MAF sensor, didn’t help. Cleaned it again, didn’t help. Started surging at idle today after I reset the ECU. Scan tool initially had readings from all O2 sensors but now there’s 0.000V from all four. Fuel system status still shows closed loop and fuel trims fluctuate with RPM.
Injectors are OEM and all recently replaced. Spark plugs are all fresh, coolant temp sensor is new and reading properly, all PM is up to date. I’m at a loss and really hoping there’s not an electrical problem somewhere.
Not sure what to check next. I have to travel Monday...
I used to have a bunch of vacuum leaks (positive fuel trim). I fixed all of those and the engine was happy for a few months with fuel trims sitting perfectly at 0 give or take 2%. Fuel economy was pretty good for a V8.
Lately my fuel economy sucks, my fuel trims are way rich (-26 to -32 on both banks). Replaced the MAF sensor, didn’t help. Cleaned it again, didn’t help. Started surging at idle today after I reset the ECU. Scan tool initially had readings from all O2 sensors but now there’s 0.000V from all four. Fuel system status still shows closed loop and fuel trims fluctuate with RPM.
Injectors are OEM and all recently replaced. Spark plugs are all fresh, coolant temp sensor is new and reading properly, all PM is up to date. I’m at a loss and really hoping there’s not an electrical problem somewhere.
Not sure what to check next. I have to travel Monday...