HELP! Jeep idles at 2500rpm

[AckAttackTJ]

I redid my exhaust this weekend and i think the rear O2 sensor is bad. My check engine light came on Monday morning. Tonight coming home the jeep wouldn't idle any lower than 2500rpm. I checked the throtle linkage and nothing is stuck. I shut her down and restarted it and it surged right back to 2500rom. Could my O2 sensor be causing this problem?
Thanks
John

 

[AckAttackTJ]

Just in case,
It's a 98 TJ 4.0 5 speed

 

[DonnyG]

Where are you located? I could take a look at it for you tomorrow night or Thursday afternoon. I'm in New London and will be in Central CT Thursday afternoon, then NorthWest CT Thursday evening. Lemme know.

Donny

 

[JeepinMaxx]

Try checking the 'check engine codes' They're listed at this previous thread (5th post down - RUBITJ): http://www.northeastjeep.org/forum/viewtopic.php?t=2584

I tried it on my wifes KJ las night and it worked (her gas cap was loose!)

:lol:

 

[Used-TJ]

A bad O2 sensor wouldn't cause the idle RPM to jump.
Did you do the complete exhauste system from the manifold back?

 

[AckAttackTJ]

I found out what my problem was. My hand throtle came loose on the shifter and was causing the jeep to run at 2500 rpm. I couldn't get that good of a look at it lastnight. As far as checking the code, i did not get one. It went through 000000-999999 but i got no code after that. I am almost positive though that the O2 sensor is causing the light. Thanks for all the help.
John

 

[JeepinMaxx]

On the code checking - on my wife's KJ it did the same thing -cycled with no error. Then I tried turning the key on and of 3 times and the Pxxxx code showed on the odometer.