Bank 1 too lean and multiple misfire
Thread Starter
CF Veteran
Joined: Feb 2011
Posts: 3,500
Likes: 0
From: Long Beach, Ca
Year: 2000
Model: Cherokee
Engine: 4.0 I6
Ok false alarm on the harness, I needed to man up a little more.
Spark plugs 1,2,3 look pretty clean on the electrode, plugs 4,5,6 have black suit on the electrode and #6 is worn down more than the others. No cracks that I can see
Spark plugs 1,2,3 look pretty clean on the electrode, plugs 4,5,6 have black suit on the electrode and #6 is worn down more than the others. No cracks that I can see
Thread Starter
CF Veteran
Joined: Feb 2011
Posts: 3,500
Likes: 0
From: Long Beach, Ca
Year: 2000
Model: Cherokee
Engine: 4.0 I6
I'm no longer getting a lean code, just the multiple missfire. O2 wires are good. If a new coil and plugs don't fix it I'm going to have to dig deep.
CF Veteran
Joined: Jul 2009
Posts: 2,522
Likes: 0
From: New Jersey
Year: 2000
Model: Cherokee
Engine: l6 HO
Thread Starter
CF Veteran
Joined: Feb 2011
Posts: 3,500
Likes: 0
From: Long Beach, Ca
Year: 2000
Model: Cherokee
Engine: 4.0 I6
Senior Member
Joined: Apr 2012
Posts: 578
Likes: 4
From: Ocean, New Jersey
Year: 2000
Model: Cherokee
Engine: 4.0
Your instant improvement is due to the new plugs. Jeep coil rail has three coil packs that fire two plugs at a time; 1,6-3,4-2,5. Multiple misfires especially from unrelated coil packs generally points away from the coil rail. You might have just needed to replace the plugs.



