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    Failed emissions

    Thanks for the input. Ended up finding a small vacuum leak on one of the fittings to the line going to the MAP. Was ever so slight and only found it by putting a vacuum tester on the line. The rubber fitting was just a fraction loose on the hard plastic vacuum line. Changed that, passed the...
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    Failed emissions

    Thanks Gary747. A lot of the tune up/ regular maintenance is always done. In fact I do pull the plugs occasionally just to check burn/clean and check gap. There are no lights/codes and my first instinct was that Cat but and trying to not just throw parts at the problem so I thought I’d get some...
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    Why is there so much hate against YJ square headlight Jeeps?

    The purest didn’t like it and felt Jeep was going in a direction that was geared towards the market and not staying true to their origins. A lot of people labeled it the Yuppie Jeep. At least that’s the story I’ve been told.
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    Failed emissions

    ‘91 YJ, 4.0, 5sp manual failed for high HC and CO. Runs great with exception of some hesitation at lights after being on the trail most of the day. Anyone got some first hand experience with this problem? Would appreciate solid ideas not shotgun mechanics.