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Black Smoke

Tiny
SUMMERSPOP
  • MEMBER
  • JEEP CHEROKEE
I have a 2000 GRAND CHEROKEE 4.7L with 120,000. I changed the plugs in it about a month ago and shortly after I noticed black smokoe from the exhaust when ever I would really give it some gas. I read up and learned that it could be caused by wrongly gapped plugs so I removed them and checked the gap. The gap were larger than the required setting so I corrected the gap all all 8 plugs but the smoking continues. One interesting thing I noticed while regapping the plugs is that all 4 plugs on the passanger side looked brand new but all 4 plugs on the driver side were covered in black soot. Any suggestions?
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Monday, May 7th, 2007 AT 12:16 PM

5 Replies

Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
Change the 02 sensor on the offending bank, running too rich!
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Monday, May 7th, 2007 AT 2:57 PM
Tiny
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Thanks for the tip, I will give it a try and let you know.
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Monday, May 7th, 2007 AT 3:10 PM
Tiny
MERLIN2021
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OK. And please vote and donate!
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Monday, May 7th, 2007 AT 3:13 PM
Tiny
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I was looking around about the O2 sensor and you said to replace the O2 sensor of the offending bank. The diagram I found shows one near the front of the exhaust and one after the CC, which one should be replaced?


https://www.2carpros.com/forum/automotive_pictures/72843_oxygen_47_1.jpg

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Monday, May 7th, 2007 AT 3:37 PM
Tiny
MERLIN2021
  • MECHANIC
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Front one.
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Tuesday, May 8th, 2007 AT 8:52 AM

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