View Poll Results: How do I pass the NOX part of the emissions test
Clean manifold cover
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0%
Replace certain valves
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High octane gas
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Low octane gas
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Fuel additive
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Smile at them
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Multiple Choice Poll. Voters: 5. You may not vote on this poll
Failing emissions. Help!
08-06-2011, 01:04 PM
#1
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Year: 1989
Model: Cherokee
Engine: 4.0L Inline 6
Failing emissions. Help!
Hi. I have a 89 4wd Cherokee, 4.0L, inline 6 cyl. I have failed emissions 3 times due to exceeding the NOX standard. I'm not failing by much (around .85 over). So here's what I've done to it, but it still fails the NOX: 1. Replaced spark plugs & wires, replaced distributor cap & rotar, replaced the CCV hoses, replaced all the other vacuum hoses, changed oil & filter, replaced EGR, (can't set timing on this engine), and prayed. Can anyone suggest anything else? At this point I'm open to anything, except bribing them. Jail isn't my thing. Help, please! Thank all in advance.
08-06-2011, 03:38 PM
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Year: 1989
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[QUOTE="cdawall"]its failing NOX for 1989? there is no NOX standard for 1989 so thats a cool trick.[/
What it's failing is the emissions inspection results. The applicable standard for Oxides of Nitrogen (NOX) in grams/mile in Phoenix, AZ is 4.50 & my jeep keeps putting out 5.40+\-.
I'm passing the Equipment tests perfectly.
What it's failing is the emissions inspection results. The applicable standard for Oxides of Nitrogen (NOX) in grams/mile in Phoenix, AZ is 4.50 & my jeep keeps putting out 5.40+\-.
I'm passing the Equipment tests perfectly.
08-06-2011, 03:39 PM
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Year: 1989
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Engine: 4.0L Inline 6
Originally Posted by Autonomous
Check your catalytic converter.
08-06-2011, 06:06 PM
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I used to have an "86 Cherokee with the 2.8 V-6 . I had never ending problems with getting it to pass emissions . I would always end up getting a can of" guaranteed to pass " . It's about ten bucks a can .
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08-06-2011, 06:54 PM
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I've noticed no one said the obvious. It could be the O2 sensor. make sure all the cables are good and not burnt. Mine fail the exact same way! I changed the O2 sensor and the EGR valve, went back and dude said
"very good, like new car" lol
"very good, like new car" lol
08-07-2011, 12:42 PM
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Year: 1989
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Originally Posted by agosto4x4Cherokee
I've noticed no one said the obvious. It could be the O2 sensor. make sure all the cables are good and not burnt. Mine fail the exact same way! I changed the O2 sensor and the EGR valve, went back and dude said
"very good, like new car" lol
"very good, like new car" lol
08-07-2011, 03:52 PM
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Year: 1987
Model: Cherokee (XJ)
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