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Old 08-27-2011, 12:47 AM   #1
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smog

I have a 87 jeep wrangler with a 4.2 runs great but will not pass smog. It has a new egr valve 02 sensor and cat converter. Does any body have any ideas?

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Old 08-27-2011, 08:37 AM   #2
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Smoke test your vacume lines, check the charcole cannister. Even one tiny pin prick hole or cracked "T" or "90" will fail smog. Start there.

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Old 08-27-2011, 10:45 AM   #3
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You also might need a carb adjustment. You might be running too rich. There is an additive called guaranteed to pass. I was skeptical but I used it on my 89 4.2 and, I passed.
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Old 08-27-2011, 06:08 PM   #4
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Post your tailpipe numbers and the maximum limits allowed. Without that information, were only guessing.

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You also might need a carb adjustment. You might be running too rich. There is an additive called guaranteed to pass. I was skeptical but I used it on my 89 4.2 and, I passed.
Yes, try snake oil, go ahead....
Every car I see with that stuff in it always fails.
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