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Can't Pass Emissions

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Old Mar 4, 2011 | 01:03 AM
  #16  
Aaron N.S.'s Avatar
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From: Helena, MT
Year: 1989
Model: Cherokee
Engine: 4.0l
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Get a PO box in MT and register your truck in MT

No emissions and loose vehicle restrictions
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Old Mar 4, 2011 | 02:14 AM
  #17  
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From: Bergen County, New Jersey U.S.A.
Year: 1990 Laredo
Model: Cherokee
Engine: 4.0 Inline 6 Renix
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i had a similiar problem and it was because my pcv was clogged up.... Have you changed that? and when was your last oil change that is what the station suggested and i passed....
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Old Mar 4, 2011 | 04:05 AM
  #18  
Morat's Avatar
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From: North Riding of Yorkshire, UK
Year: 1997
Model: Cherokee
Engine: 4.0
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Time to buy a couple of quarts of denatured alcohol?
(I didn't say that)
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Old Mar 4, 2011 | 09:06 AM
  #19  
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From: Round Rock, TX
Year: 1999
Model: Cherokee
Engine: 4.0L
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Oil change wasn't even 400 miles ago. My old man said the jeep doesn't have a pcv valve anywhere on it, and I didn't find one either. I got the O2 sensor for it, and I'm taking it to the guys that did the CAT, cause they pass pretty much anyone, and after paying for that CAT they better just pass me haha.
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Old Mar 4, 2011 | 09:17 AM
  #20  
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From: Aberdeen, MD
Year: 1995
Model: Cherokee
Engine: 4.0L HO I-6, 703 Injectors, Brown Dog Super Engine Mounts
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there's a "CCV fitting" on top of the valve cover, but it being clogged wouldn't cause your issue.

I'm confident the o2 sensor is the culprit.
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Old Mar 4, 2011 | 10:14 PM
  #21  
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From: Round Rock, TX
Year: 1999
Model: Cherokee
Engine: 4.0L
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well that is changed and it's getting tested tomorrow morning
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Old Mar 6, 2011 | 12:44 AM
  #22  
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From: Round Rock, TX
Year: 1999
Model: Cherokee
Engine: 4.0L
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Well replaced the O2 sensor, and it would not pass still...then finally at the end of the day it passed and almost everything was a zero...no clue what went on but it passed
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Old Mar 6, 2011 | 01:25 AM
  #23  
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From: Modesto, CA
Year: 1989
Model: Cherokee
Engine: 4.0
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Originally Posted by Morat
Time to buy a couple of quarts of denatured alcohol?
(I didn't say that)
I've heard alot of stories that it works, i even tried it myself, but had a hidden vacuum leak on my 240sx, and it failed because of it. Never got the chance to see if it really does...
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