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Old 10-23-2012, 08:46 PM
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black smoke

What causes sometimes rough idle and blowing black smoke upon accelerating hard on my 96 Grand Cherokee with inline 6 cyl??? thanks

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Old 10-23-2012, 09:01 PM
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Re: black smoke

too rich?
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Old 10-23-2012, 09:09 PM
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Re: black smoke

Yes, seems too rich, but I don't know what is causing it. Runs very good above idle like on highway. Peppy, but with some black smoke on heavy acceleration.
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Old 10-23-2012, 09:15 PM
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Re: black smoke

Check this forum for more help.....

Grand Cherokee - ZJ - Jeep Garage - Jeep Forum
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Old 10-23-2012, 09:33 PM
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Re: black smoke

Thanks! I checked the link to the forum, but didn't find anything directly related to this problem. thanks, guys
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Old 10-29-2012, 11:11 AM
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Re: black smoke

Have you tried pulling any codes? Might at least give you a place to start looking.

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Old 10-29-2012, 11:28 AM
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Re: black smoke

Can you get codes from a 96?
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Old 10-29-2012, 11:56 AM
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Re: black smoke

OK guys, I'm done. Took it to garage and it was O2 Sensor upstream. Thanks for all the help!!
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