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Old 02-02-2011
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Low Emission Vehicle

I noticed that my truck has a sticker that says L.E.V. I was wondering if I could remove 1 cat and straight-pipe that section and still pass emissions considering the fact that the truck is already an L.E.V.

Feel free to call me an idiot for thinking this. I thought it sounded pretty stupid myself.

Last edited by Giraffe02; 02-04-2011 at 10:40 PM.
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Old 02-04-2011
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I think the LEV deal has to do with lower emission idling. If a visual inspection is ever done on your vehicle you will fail before the sniffer goes in.
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Old 02-04-2011
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Well basically, here's the story. My cat is semi-busted. It overheated because of misfiring and now it's basically busted. I think I can pass emissions with the way it is now but until I have to pass emissions, I just want to straight-pipe that section. It is the first cat on the exhaust line and I'm just wondering if I could straight pipe it without screwing with the O2 sensors or anything. I can just weld the old cat back on when I have to pass emissions.
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Old 02-04-2011
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Bottom line = Is my CEL going to turn on for straight piping the first catalytic converter? Even though I think it's busted, my CEL isn't on so if I straight-pipe that section, will it turn on, or no?!
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Old 02-04-2011
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If the first cat was busted the CEL would be on in the first place for CAT low efficiency.
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Old 02-04-2011
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Well, from my symptoms I would say that a clogged cat would definitely cause the issue but there is no CEL. I only think it's the cat because when my truck was misfiring I remember hearing a hissing sound and looking under the truck to find that my first cat was really red hot.
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Old 02-04-2011
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Old 02-05-2011
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Hmm, I could try cleaning it. Thanks.
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