'88 exhaust emitting grey/black smoke
05-27-2011, 06:33 PM
#1
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Year: 1989
Model: Cherokee
Engine: Inline 6, 4.0L
'88 exhaust emitting grey/black smoke
When I crank my cherokee, it starts putting out a fair amount of smoke. I let it run today for about 5 minutes and it still smoked. It's not really thick but smoky none the less. What could this be? If anymore information is needed just ask, any help is appreciated.
05-27-2011, 07:02 PM
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Year: 1989
Model: Cherokee
Engine: Inline 6, 4.0L
Gas mileage is terrible, but then again I only use it on dirt roads, top speeds of 40mph, with 33's and 4:10 gearing. My oil level has been at the same place for the past 6 months, but I only drive it on the weekends so If it does leak, it doesn't leak much. As far as coolant goes, I have no idea. I've never owned an xj before, I don't even know how to check the coolant level. I'm ashamed to admit that. Not engine savvy at all
05-27-2011, 07:11 PM
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Year: 2001
Model: Cherokee
Engine: 4.0L I6 HO
Originally Posted by '89_Cherokee
Gas mileage is terrible, but then again I only use it on dirt roads, top speeds of 40mph, with 33's and 4:10 gearing. My oil level has been at the same place for the past 6 months, but I only drive it on the weekends so If it does leak, it doesn't leak much. As far as coolant goes, I have no idea. I've never owned an xj before, I don't even know how to check the coolant level. I'm ashamed to admit that. Not engine savvy at all
05-27-2011, 07:40 PM
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Year: 1997
Model: Cherokee
Engine: 244 CID High Output (4.0)
Why hasn't anyone asked what color...?
What color is the smoke? Most of the time, color is indicative of the cause. It could very well just be excess carbon buildup.
What color is the smoke? Most of the time, color is indicative of the cause. It could very well just be excess carbon buildup.
05-27-2011, 08:19 PM
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Year: 2001
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ha its funny you said that, thats the reason i first asked what kind of oil was put in cause dark grey and even mid grey smoke means improper burning sometimes and could be a build up
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05-27-2011, 11:28 PM
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Year: 1989 xj sport 2dr
Model: Cherokee
Engine: 12 hole bosch Injectors
orignial post state grey/black with the bad mileage i suspect o2 sensor or possible coolant tem sensor iss could be shot since renix has no cel its meter timehttp://www.lunghd.com/Tech_Articles/..._Diagnosis.htm
Last edited by freegdr; 05-27-2011 at 11:34 PM.
05-28-2011, 12:07 AM
#9
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Year: 1997
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Engine: 244 CID High Output (4.0)
I doubt o2 sensor. I've never seen a 4.0 run so rich it smokes. If anything, these engines run too lean even running rich.
05-28-2011, 12:20 AM
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Year: 1989 xj sport 2dr
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Engine: 12 hole bosch Injectors
exhaust color chart
http://www.salemboysauto.com/original-faqs/faq-38.htm see this chart
Last edited by freegdr; 05-29-2011 at 01:46 AM.
05-28-2011, 10:16 PM
#11
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Year: 1989
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Black/dark grey smoke. I was thinking worn rings myself. How would an o2 censor cause smoke?
06-01-2011, 08:13 PM
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Year: 1989
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Engine: Inline 6, 4.0L
So it's running to rich. If it helps, it idles around 500-750 rpm. What do you guys think I should start with to try and fix it?
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