help with my 2004 jeep liberty sport. just bought it!!!

[apollokids]

So I just purchased a 2004 jeep liberty sport 3.7l 5 speed manual. It's got 120k miles. Just recently I was driving down the road. Coming from a stop light on red I shifted into 2nd and was hitting over 2k rpms and it jerk ed back and forth. I decided to go into 3rd next and sure enough exactly a lil over 2k rpms it was jerking back and forth. No smoke was coming out the back. It's very smooth at idle (well at first). So I pulled into an advanced to get codes read and it came up o2 sensor. Next day I did rive it around for hours np. Then the next after I let the jeep warm up around 2 miles later it does it again. It's like it doesn't want to exceed 2k rpms. I can smoothly shift into any gear to bypass it if I do it right at 2k rpms and not go over at all. So I took to a garage and cam sensor light code popped. Got it replaced and on the way home about 20min later it happens again coming from a red light. Every time it's random except I do know it's after jeep has warmed up and been running for around 20min or more. I now have at same mechanic which I fully trust and cam sensor is popping same code again with o2 code. They decide to keep it for the day and test drive. It now is trying to die when idle and when u drive it won't have much power, at low rpms it will shake like there's no power and it wants to cut off. It has died at idle 2x now. They said it's the pcm as they have worked on plenty chrysler and jeeps. Any help please. No warranty covers it so it's up to me. Sorry such a long post. I love my jeep but need to get it figured out asap cause I'm not rich lol.

 

[apollokids]

Edit: I'm at work so will try to respond to any questions asap.
Any else have this sort of issue. I've seen similar ones all over Internet but with no fixes. Most say either cam sensor crank sensor fuel rail fuel filter clogged cat or pcm.

 

[HoosierJeeper]

Did you replace those sensors with Mopar/NTK ones? The KJ, for O2 and cam position ones usually rejects aftermarket ones. Just an idea. Those symptoms seem like a cam position sensor.

 

[apollokids]

Umm I don't remember. They were at advanced. I'll look them up online to see. But literally 45 min after new cam installed it happened again. Is it possible pcm? I just wanna know for sure before I pay a lot of money next week. Thanks for the reply tho. I'll check next 45min

 

[HoosierJeeper]

I guess it could be the PCM but it's not likely. I would try putting in Mopar sensors.

http://www.jeepkj.com/forum/f196/cam-shaft-sensor-problem-59330/

That thread is worth a read I think
http://www.jeepkj.com/forum/f196/cam-shaft-sensor-problem-59330/

 

[apollokids]

Ok thanks. I'll put another in of that brand u mentioned. I'll keep post updated. Any other ideas anyone let me know. Thanks a bunch so far hoosier

 

[apollokids]

Mobile: CARQUEST by BWD Engine Camshaft Position Sensor CSS635: Advance Auto Parts
Sensor from advanced.

 

[sota]

which code exactly?
it only does this after it warms up? if so that combined with an O2 sensor code (FYI, you have multiple O2 sensors, so the code is important) makes me think an open loop vs. closed loop issue, and also would point to a messed up O2 sensor. i've seen various vehicles do some of the most bizarre crap when an O2 sensor goes wonky, even to the point of not throwing a code when the vehicle's running like a steaming dog pile.

One of the rules i've always abided by when buying a used car:
expect do all kinds of maintenance on it almost immediately...
(if applicable)
plugs, cap, rotor, wires, all fluids, brakes, "disposable" sensors (O2 is one of them)