mdmbkr
NAXJA Forum User
- Location
- Pembroke Pines, FL
Hi,
My 99 XJ has 225k miles. It makes great power all through the power band, except when I floor it, there's a weak spot around 2500 rpm. It feels as though I lifted the accelerator about halfway and then floored it again. Above the flat spot it pulls hard to redline.
Other potentially related symptoms: For about 30 seconds after startup, the motor wants to die and makes little power. If I give it enough throttle, it will "snap" to life (you can feel a little kick in the pedal) and run fine afterward. This is most pronounced when the motor is hot soaked. Also I can occasionally smell overly-rich gas fumes when I drive around - not all the time though.
The whole Jeep is stock. No codes. Plugs/wires and TPS are pretty new; air filter is clean. MAP and coolant temp sensors test good. TB recently thoroughly cleaned. Cracked exhaust manifold.
At this point I sort of suspect the O2 sensors are not working right, but the fact that there are no codes makes me hesitant to spend the $120 for two new sensors that I may not need. Any advice?
My 99 XJ has 225k miles. It makes great power all through the power band, except when I floor it, there's a weak spot around 2500 rpm. It feels as though I lifted the accelerator about halfway and then floored it again. Above the flat spot it pulls hard to redline.
Other potentially related symptoms: For about 30 seconds after startup, the motor wants to die and makes little power. If I give it enough throttle, it will "snap" to life (you can feel a little kick in the pedal) and run fine afterward. This is most pronounced when the motor is hot soaked. Also I can occasionally smell overly-rich gas fumes when I drive around - not all the time though.
The whole Jeep is stock. No codes. Plugs/wires and TPS are pretty new; air filter is clean. MAP and coolant temp sensors test good. TB recently thoroughly cleaned. Cracked exhaust manifold.
At this point I sort of suspect the O2 sensors are not working right, but the fact that there are no codes makes me hesitant to spend the $120 for two new sensors that I may not need. Any advice?