Hello fellow bitogers,
i have a 2007 corolla with 145k miles that is throwing the P0171 bank 1 running lean code. The car runs just fine and has no issues with acceleration or drivability but the trim numbers bug me.
Checking the fuel trims they are +32% at idle and go up to +44% when at 1800 rpm or above but that's where it maxes out.
The increase in fuel trim with increased rpm has pointed me away from a vacuum leak although i still did a smoke test and came back with nothing.
There's been a new set of injectors without change
fuel pressure test shows 44psi with the vehicle on and stays consistent with revving just before the fuel rail and holds pressure well
Maf sensor has been cleaned and reads 2.2ish g/s at idle (possibly high?) and 15-17ish at 2200 rpm
The Air fuel ratio sensor reads in the normal range of around 3.1-3.5v resting around 3.3 mostly
the Air fuel equivalence ratio stays around 14.5-15 (isnt ideal 14.7?)
I'm thinking possibly an exhaust leak in front of the front o2/AF ratio sensor but haven't checked yet
what say yee experts?
i have a 2007 corolla with 145k miles that is throwing the P0171 bank 1 running lean code. The car runs just fine and has no issues with acceleration or drivability but the trim numbers bug me.
Checking the fuel trims they are +32% at idle and go up to +44% when at 1800 rpm or above but that's where it maxes out.
The increase in fuel trim with increased rpm has pointed me away from a vacuum leak although i still did a smoke test and came back with nothing.
There's been a new set of injectors without change
fuel pressure test shows 44psi with the vehicle on and stays consistent with revving just before the fuel rail and holds pressure well
Maf sensor has been cleaned and reads 2.2ish g/s at idle (possibly high?) and 15-17ish at 2200 rpm
The Air fuel ratio sensor reads in the normal range of around 3.1-3.5v resting around 3.3 mostly
the Air fuel equivalence ratio stays around 14.5-15 (isnt ideal 14.7?)
I'm thinking possibly an exhaust leak in front of the front o2/AF ratio sensor but haven't checked yet
what say yee experts?