Bank 1 too lean and multiple misfire
04-02-2013, 09:50 AM
#49
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Year: 2000
Model: Cherokee
Engine: 4.0 I6
And this stupid coil harness does not want to come off!!! I've got the red locking tab out and still won't budge....
04-02-2013, 10:04 AM
#50
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Year: 2000
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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
04-02-2013, 10:06 AM
#51
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Year: 1999
Model: Cherokee
Engine: 4.0L OBD-II
Fouled spark plugs but a code for running too lean? Is the wiring for the O2s okay? Manifold bolted up properly, no leaks?
04-02-2013, 10:09 AM
#52
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Year: 2000
Model: Cherokee
Engine: l6 HO
I have a slightly similar issue. No codes/smoke/smell though. But a slight miss when the jeep is cold so mine isn't o2 related.. I have a 00 also.
04-02-2013, 10:21 AM
#53
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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.
04-02-2013, 01:14 PM
#54
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New coil and plugs in. We'll see how this goes. Engine fired up right away though, quicker than before.
04-02-2013, 06:16 PM
#55
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04-02-2013, 09:10 PM
#56
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04-03-2013, 07:04 AM
#58
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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.
04-03-2013, 07:17 AM
#59
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Possibly, theres no way to tell really. Though when I checked the gap on the old plugs they were pretty bad,around .045+ on each.