CA Smog Check Question

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CarGuru > Technology > CA Smog Check Question 11 April 2005 02:56:31

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CA Smog Check Question
Nelson 3 April 2005 02:47:45
	I have a question about passing the California Smog Check Test. I have a 1988 Mazda 929 that did not pass so I had a tune-up and then returned to the testing place. This time it passed everything except the CO part. It did pass at the 15 mph part but failed at the 25 mph part of the test. It was .69 when .59 was required to pass. The guy told me that it was in parts per million. Someone told me to go and fill up with the Chevron Techron gas and it would then pass. Someone else said to use premium rather that regular unleaded and that would put it over the passing point. Any ideas from anybody?? What else can I do and why did it not pass this little part?? Thanks!!
		Add comment


Don Bruder 3 April 2005 03:33:43 [ permanent link ]
	In article <liF3e.1331$N13.1140@newsread3.news.pas.earthlink.net>, "Nelson" <cyberclone@earthlink.net> wrote: I have a question about passing the California Smog Check Test. I have a > 1988 Mazda 929 that did not pass so I had a tune-up and then returned to the > testing place. This time it passed everything except the CO part. It did > pass at the 15 mph part but failed at the 25 mph part of the test. It was > .69 when .59 was required to pass. The guy told me that it was in parts per > million. Someone told me to go and fill up with the Chevron Techron gas and > it would then pass. Someone else said to use premium rather that regular > unleaded and that would put it over the passing point. Any ideas from > anybody?? What else can I do and why did it not pass this little part?? > Thanks!! My best guess: It's running rich and/or the cat is toasted. (Or perhaps the cat's toasted BECAUSE it's been running rich...) -- Don Bruder - dakidd@sonic.net - New Email policy in effect as of Feb. 21, 2004. Short form: I'm trashing EVERY E-mail that doesn't contain a password in the subject unless it comes from a "whitelisted" (pre-approved by me) address. See <http://www.sonic.net/~dakidd/main/contact.html> for full details.
		Add comment


Mark Levitski 3 April 2005 04:28:33 [ permanent link ]
	what is "rich"?
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Don Bruder 3 April 2005 05:19:53 [ permanent link ]
	In article <RMG3e.28618$hU7.6106@newssvr33.news.prodigy.com>, "Mark Levitski" <MetalBladeSPAMNOMORE@SPAMNOMOREprodigy.net> wrote: what is "rich"? > More fuel in the fuel-air mixture than there's supposed to be. IIRC, 16:1 is the "ideal" air:fuel ratio that most emissions control systems are designed to work with. More than that, and they can't cope. Excess fuel in the mix can't burn completely because there isn't enough O2, resulting in increased CO (and maybe some excess HC as a bonus, if the mix is far enough off) leaving the cylinder. Cats are supposed to clean it up by "finishing the burn", but if the excess is too much, they can't cope with the task, and what comes out the tailpipe is higher in CO than what's allowed by the smog-check specs. Same thing happens if the cat is shot, but the mix is right - ALL IC engines produce some amount of CO as exhaust, since "the ideal mix as calculated in a lab with everything precisely controlled" and "the mix we can achieve under varying real world conditions" seldom (if ever) match exactly. In that case, if the cat's gone, that excess CO just flows right on out the tailpipe, and gives a too-high CO level. A working cat would turn that CO into CO2. -- Don Bruder - dakidd@sonic.net - New Email policy in effect as of Feb. 21, 2004. Short form: I'm trashing EVERY E-mail that doesn't contain a password in the subject unless it comes from a "whitelisted" (pre-approved by me) address. See <http://www.sonic.net/~dakidd/main/contact.html> for full details.
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Mark Levitski 3 April 2005 06:01:53 [ permanent link ]
	Sorry to bother you and make you write a long message. I did a 15-minute Internet search via Google and found answers 100%
		Add comment


Mark Levitski 3 April 2005 06:02:43 [ permanent link ]
	the sources specify a different "ideal ratio", not 16:1 but 14.7:1. I forgot the website but I saved it, except no address
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Backbone 3 April 2005 06:31:42 [ permanent link ]
	14.7 parts air to 1 part fuel or stoichiometric is the perfect air/fuel mixture i.e. the fuel is completely burned. It's common for your system to use more than the 14.7:1 ratio. Increases the chances for a complete burn. also, more air is sometimes used to control the temp within the combustion chamber! -- Remove flaps to reply "Mark Levitski" <MetalBladeSPAMNOMORE@SPAMNOMOREprodigy.net> wrote in message news:79I3e.20356$Vo7.2491@newssvr31.news.prodigy.com...> the sources specify a different "ideal ratio", not 16:1 but 14.7:1.> I forgot the website but I saved it, except no address>
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Mark Levitski 3 April 2005 06:40:56 [ permanent link ]
	Mixture that's too lean (more air) will ruin the engine in no time. I am not in the business of impressing public with whatever power benefit comes with altering this stoichometric ratio, I am an environmentalist and also dont want cancer of which exhaust/pollution is the second contributor (first is artificial materials/food additives, etc.). To use technical language: Watching for "lean burn" is critical, especially with cars that are stuffing a whole bunch more air into the engine with a turbocharger or a supercharger. If you introduce a lot of air into an engine without also adding more fuel, you will blow up the motor in no time. What's more critical to watch for is the lean burn, especially with cars that are stuffing a whole bunch more air into the engine with a turbocharger or a supercharger. If you introduce a lot of air into an engine without also adding more fuel, you will blow up the motor in no time.
		Add comment


Don Bruder 3 April 2005 08:06:25 [ permanent link ]
	In article <79I3e.20356$Vo7.2491@newssvr31.news.prodigy.com>, "Mark Levitski" <MetalBladeSPAMNOMORE@SPAMNOMOREprodigy.net> wrote: the sources specify a different "ideal ratio", not 16:1 but 14.7:1. Ahhh.. my Bad. Now to figure out how/why I came up with 16:1. Aha! Perfect excuse! "The dog ate my homework!" But seriously, I guess I DON'T recall correctly. <sigh> I guess they're right - MEmory IS the first thing to go! -- Don Bruder - dakidd@sonic.net - New Email policy in effect as of Feb. 21, 2004. Short form: I'm trashing EVERY E-mail that doesn't contain a password in the subject unless it comes from a "whitelisted" (pre-approved by me) address. See <http://www.sonic.net/~dakidd/main/contact.html> for full details.
		Add comment


Backbone 3 April 2005 09:53:10 [ permanent link ]
	I could be wrong but I believe that the computer will do it's best to run the engine at stoichiometric. Also includes additional air at any given time. I wasn't specific as to where the air came from. <grin> exhaust gas recirc valve injects burned air back into the combustion chamber i.e. it cannot re-burn therefore it cools the combustion process! -- Remove flaps to reply "Mark Levitski" <MetalBladeSPAMNOMORE@SPAMNOMOREprodigy.net> wrote in message news:YII3e.20372$0v7.18793@newssvr31.news.prodigy.com...> Mixture that's too lean (more air) will ruin the engine in no time. I am> not in the business of impressing public with whatever power benefit comes> with altering this stoichometric ratio, I am an environmentalist and also> dont want cancer of which exhaust/pollution is the second contributor (first> is artificial materials/food additives, etc.). To use technical language:> Watching for "lean burn" is critical, especially with cars that are stuffing> a whole bunch more air into the engine with a turbocharger or a> supercharger. If you introduce a lot of air into an engine without also> adding more fuel, you will blow up the motor in no time. What's more> critical to watch for is the lean burn, especially with cars that are> stuffing a whole bunch more air into the engine with a turbocharger or a> supercharger. If you introduce a lot of air into an engine without also> adding more fuel, you will blow up the motor in no time.>
		Add comment


Mark Levitski 4 April 2005 00:19:14 [ permanent link ]
	Yes... O2 sensor is constantly adjusting fuel injection based on O2 and CO/CO2 contents in the exhaust, this sensor is in your exhaust so ideally it attempts to maintain proper air/fuel ration, i was just replying to the guy who offered to change ratio too far from ideal/stoichometric to get certain benefits, dont know what it was, but i am not interested, i am interested in clean exhaust and th emazing fatc: My 2004 Nissan Sentra is rated PZEV = Partially Zero-Emissions vehicle. I feel normal even when engine running and I am close to tailpipe, my previous experience with other peoples and their cars is that it stinks sometimes even a block away, and it's colored. My exhaust is is not far from plain warm/humid air and my next vehicle would be Hydrogen ideally but more realistically could be a light hybrid. Unfortunately Nissan is not upto date with other players e.g. Ford, GM, Toyota and Honda, but at least my 10-year old experienc ewith Sentras is that of a cheap, light, fuel efficient car with no luxury or excessive comfort, a little but reliable and fuel effcient horse that takes me where i need to be
		Add comment


Mark Levitski 11 April 2005 02:56:31 [ permanent link ]
	What is your problem? Wanna take it outseide and have a conversation like a real man??
		Add comment

CarGuru > Technology > CA Smog Check Question 11 April 2005 02:56:31

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