Can't Pass Emissions
CF Veteran
Joined: Feb 2011
Posts: 3,074
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From: Bergen County, New Jersey U.S.A.
Year: 1990 Laredo
Model: Cherokee
Engine: 4.0 Inline 6 Renix
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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Seasoned Member
Joined: Jan 2011
Posts: 349
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From: Round Rock, TX
Year: 1999
Model: Cherokee
Engine: 4.0L
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.
☠ CF Sheriff ☠

Joined: Nov 2009
Posts: 15,197
Likes: 18
From: Aberdeen, MD
Year: 1995
Model: Cherokee
Engine: 4.0L HO I-6, 703 Injectors, Brown Dog Super Engine Mounts
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.
I'm confident the o2 sensor is the culprit.
Thread Starter
Seasoned Member
Joined: Jan 2011
Posts: 349
Likes: 0
From: Round Rock, TX
Year: 1999
Model: Cherokee
Engine: 4.0L
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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