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post #1 of (permalink) Old 07-29-2002, 06:46 PM
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emissions test report...failed(edited)!

here goes...

cruise limit:HC=150, CO=1
my cruise Emissions:HC=176, CO=2.84

idle limit:HC=220, CO=1.2
my idle emissions:HC=390, CO=4.69

I edited it for ya. I figure that I will get a new air filter and lean out the carb a little then do the timing accordingly. Anything else I could do to give it a better chance? Thanks for the help
Tim
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post #2 of (permalink) Old 07-29-2002, 06:50 PM
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Re: emissions test report...failed!

Weber is a performance carb, it is not made to be emissions legal. All I can suggest is make sure your air cleaner is clean, and if you want to bother, try leaning up your mixture by rejetting, just for the emissions test. Too lean will burn up your engine. Check and see what size jets are in your carb, then go one size smaller. I personally wouldn't do it, but I can't think of what else to do. Oh yeah, check your timing, make sure plugs are new and properly gapped, wires good, etc.
post #3 of (permalink) Old 07-29-2002, 07:12 PM
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Re: emissions test report...failed!

Thanks. I heard people passed using methane gas? My carb is supposed to be "legal" so shouldn't that mean It should pass? There must be something that I can do to adjust it. Thanks again for the help.
Tim
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post #4 of (permalink) Old 07-29-2002, 09:28 PM
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Re: emissions test report...failed!

bttp
post #5 of (permalink) Old 07-29-2002, 09:55 PM
 
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Re: emissions test report...failed(edited)!

High HC and CO levels are both an indication of incomplete combustion, which means it's probably running a little too rich. Other causes could be misfires due to bad plugs and/or wires and timing.
I would lean out the carb a bit, check the wires and plugs, and make sure the timing is set correctly, and try again.
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post #6 of (permalink) Old 07-29-2002, 10:16 PM
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Re: emissions test report...failed(edited)!

cool. thanks. New plugs are in it and I'm gonna lean out the carb and set the idle tomorrow. Anything else I can do or just let the sniffer speak?
Tim
post #7 of (permalink) Old 07-29-2002, 10:31 PM
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Re: emissions test report...failed(edited)!

Quick question on this...

I have my timing and metering pins set so that it runs well at my altitude, since this is the altitude that I commonly run. I live at 10,000 feet, so the question is, will my jeep run richer or leaner when I take it for testing, which is at about 6000 feet?
post #8 of (permalink) Old 07-30-2002, 03:36 PM
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Re: emissions test report...failed(edited)!

Since as you go lower in elevation the oxygen (air) content is greater, you would likely run leaner. If the jets are doing fine at 10,000ft they will supply the same amount of fuel at 6,000ft but you will be sucking in a higher air content.

I believe this is the case.
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post #9 of (permalink) Old 07-30-2002, 03:37 PM
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Re: emissions test report...failed(edited)!

Depending on whether your piston rings are sealing well or not, I have heard people say getting an oil change just before emissions will also increase you chances of passing
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