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Jeep Wrangler YJ
YJ General Discussion
Failed CA Smog
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<blockquote data-quote="TimberTim" data-source="post: 437722" data-attributes="member: 20208"><p>yup, same thing happened to me. My Tech said to look for exhaust leaks between the combustion cylinder and the o2 sensor, So it looks like your vaccum cleaner diagnosis is spot on. I removed my exhaust manifold and found 3 major cracks on the underneath side, I purchased a new manifold from Napa for under $100 bucks and installed it ( be sure to straight edge the mating surface before installing), I had to mill the mating surfaces to flatten them out, I used a floor mounted belt sander and it worked just fine. get creative and overcome. My 91 has passed Calif. Smog for the last 4 times with flying colors now. If this doesn't get you passed pm me for some quick and clean tricks of the trade to help in your quest . Tim from the North Bay</p></blockquote><p></p>
[QUOTE="TimberTim, post: 437722, member: 20208"] yup, same thing happened to me. My Tech said to look for exhaust leaks between the combustion cylinder and the o2 sensor, So it looks like your vaccum cleaner diagnosis is spot on. I removed my exhaust manifold and found 3 major cracks on the underneath side, I purchased a new manifold from Napa for under $100 bucks and installed it ( be sure to straight edge the mating surface before installing), I had to mill the mating surfaces to flatten them out, I used a floor mounted belt sander and it worked just fine. get creative and overcome. My 91 has passed Calif. Smog for the last 4 times with flying colors now. If this doesn't get you passed pm me for some quick and clean tricks of the trade to help in your quest . Tim from the North Bay [/QUOTE]
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Jeep Wrangler YJ
YJ General Discussion
Failed CA Smog
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