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Smog help!!

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Old Feb 9, 2011 | 07:39 PM
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idnthv1
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Hey guys just had my jeep tested and it failed... Only part it failed was the NO section, any ideas as what it could be? Fwiw it's a 94 4.0 just replaced the engine with a low mileage one.
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Old Feb 9, 2011 | 07:54 PM
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From: Lyons, Oregon
Year: 1991
Model: Cherokee
Engine: 4.0 HO
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probably running too lean, check your 02 sensor. I'd also check your air filter (that would make it rich though). Coach
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Old Feb 9, 2011 | 08:37 PM
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Brand new air filter, it may need a new fuel filter but I don't think that would cause the NO level to be high...
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Old Feb 9, 2011 | 10:02 PM
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I really like my smog guy! If one of my cars/trucks fails, he tells me what it needs. I go home and fix it, bring it back, and it passes.

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Old Feb 10, 2011 | 09:13 AM
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Yea I wish I personally would have went.... I sent my gf to do it while I was at school and the guy didn't tell her much at all.
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