stinsonbr

Hey all,
I have a 2000 XJ, just shy of 200K miles. This problem began fairly recently, where when I begin to accelerate (lets say from a stop), I sometimes get a repeated loss of power, similar to if you were to repeatedly press and release the gas pedal. This usually happens at lower speeds. And after a while, usually after it warms up, it will idle very low (~200 RPM) and pretty rough, obviously.

Vacuum leak? Fuel Pump? Any ideas?

I also have a bit of a transmission issue, but lets stick to one problem at a time.

Also, TPS, CPS, and NSS have been recently replaced.

Help Please!

Gee oh Dee

Could be o2 sensor or temp sensor.

Try scanning for codess, even if the CEL isnt on.

stinsonbr

Ah, I forgot to say. I have been getting O2 sensor codes. Could that really cause this issue?

Photojared

Yes it can

stinsonbr

Well, I'll change them and hopefully see a result. Thanks!

stinsonbr

I got codes for sensor 1 and sensor 2, and I haven't seen a diagram for the locations of them. Anybody know if those are the downstream ones?

partsguyct

Sensor 1 is upstream 2 is down

stinsonbr

Update: Replaced O2 sensors, and it runs great. Thanks everyone

Cheers

NorCalJeep

what O2 sensors did you use? Thanks for replying?

Gee oh Dee

Hope it wasnt Bosch.

partsguyct

what o2 sensors are better for jeep? I know these things are pretty picky for a lot of parts

Gee oh Dee

I dont remember what the good ones are for the newer XJs. Bosch is good for Renix Jeeps, like mine, but not for the newer model ones.

partsguyct

I'll probably just go with denso when I swap mine or ntk both are supposed to be better than bosch and actually a little less expensive most times