What did you do to your Cherokee today?
CF Veteran
Joined: Sep 2010
Posts: 12,692
Likes: 6
From: Mercer County, NJ
Year: 2001
Model: Cherokee
Engine: 4.0L I6 HO
Originally Posted by mrfajita
Cleaned the o2 sensor to try to make it run better. Now it runs even worse, and drops to 200rpm at stops almost stalling. Why would this happen?
Seasoned Member
Joined: Mar 2011
Posts: 491
Likes: 0
From: Powhatan, VA
Year: 2000
Model: Cherokee
Engine: 4.0 I6
Originally Posted by mrfajita
Cleaned the o2 sensor to try to make it run better. Now it runs even worse, and drops to 200rpm at stops almost stalling. Why would this happen?
Hah I figured.
CF Veteran
Joined: Sep 2010
Posts: 12,692
Likes: 6
From: Mercer County, NJ
Year: 2001
Model: Cherokee
Engine: 4.0L I6 HO
Originally Posted by mrfajita
I did put it in right. I didn't even disconnect it so it can't be reconnected wrong.
Hah I figured.
Hah I figured.
CF Veteran
Joined: Sep 2010
Posts: 1,992
Likes: 0
From: West Bloomfield,MI
Year: 1996
Model: Cherokee
Engine: 4.0L, CAI, Edelbrock Breather, Optima Yellowtop
Is the engine running rich or is it running lean?
Try resetting the PCM and see what happens. If you get the same results, replace your o2 sensor it might be shorted.
CF Veteran
Joined: Nov 2010
Posts: 2,139
Likes: 1
From: chillicothe, OH
Year: 1991
Model: Cherokee
Engine: 4.0
I ran into a downed powerline guy wire today on our way back from Old Man's Cave. Tree had fallen and brought lines down with it. It had just happened. I hit only a guy wire. Not sure even where the electric lines were. Didn't hang to find out. Had to get Nolan to a dr appt. Glad I hit it before one of the hundreds of motorcycles we saw today hit it. Left a good mark on the Jeep. Started chewing through the steele at the top of the front drivers side fender. Glad I was paying attenetion or it could have been much worse! Thank you Lord!!!
I cleaned it with carb cleaner, probably a bad idea. Definitely running rich, I burned almost 1/8 tank in about 13 miles and I can smell the cat converter burning up. I did reset the PCM and it didn't help.
CF Veteran
Joined: Sep 2010
Posts: 1,992
Likes: 0
From: West Bloomfield,MI
Year: 1996
Model: Cherokee
Engine: 4.0L, CAI, Edelbrock Breather, Optima Yellowtop




