I have a miss at high rpm sometimes in my 1991 mustang. With the engine running I pull these two codes 41 and 91. "o2 Sensor voltage low sensor lean" my fuel consumption seems to be high and the car just isn't running right. I have replaced the o2 sensors that didnt help. Does anyone out there have any idea what this could be. I tuned the car up (plugs, cap, wires, rotor, I have tested the coil and the ignition module both check out. Could the stock fuel pressure regulator be bad? I have also replaced the fuel pump with a 190lph FRPP model and I replaced the filter at the same time. Any help here is appreciated. Thanks
Trouble Codes 41 and 91 miss
- Thread starter sphugh1967
- Start date
If the miss occurs at WOT, that suggests that it is not the O2's anyhow (it was a good idea to replace them though, from the sound of it).
I would look for a vac leak for that code.
It could be something as simple as two plugs wires sitting next to eachother, and at high RPMs they misfire (it happens).
Good luck.
I would look for a vac leak for that code.
It could be something as simple as two plugs wires sitting next to eachother, and at high RPMs they misfire (it happens).
Good luck.
