LAS VEGAS XJ GROUP-----> 1st ROLL CALL.
Seasoned Member
Joined: Feb 2011
Posts: 464
Likes: 0
From: las vegas
Year: 1993
Model: Cherokee
Engine: 4.0
Pull a plug and check it. Make sure they are clean and not burned. Vacuum leak will cause a lean mixture, which will cause high HC and CO. And yours are excessively high. A bad O2 sensor will cause a lean mixture, which in turn causes high HC and CO... so it's kind of a, check everything and replace as needed scenario.
Seasoned Member
Joined: Feb 2011
Posts: 464
Likes: 0
From: las vegas
Year: 1993
Model: Cherokee
Engine: 4.0
Seasoned Member
Joined: Feb 2011
Posts: 464
Likes: 0
From: las vegas
Year: 1993
Model: Cherokee
Engine: 4.0
Seasoned Member
Joined: Feb 2011
Posts: 464
Likes: 0
From: las vegas
Year: 1993
Model: Cherokee
Engine: 4.0
Seasoned Member
Joined: Feb 2011
Posts: 464
Likes: 0
From: las vegas
Year: 1993
Model: Cherokee
Engine: 4.0


