No
- Thread starter suprasport91
- Start date
Nitrogen oxide is NO, not NOx, it doesnt matter, my brothers Car wont pass the Nitrogen Oxide test, everything alse was pretty low though
Make sure the car is warmed up when they test it. You could also add a little octane booster to help combustion.
If the shop tests from the end of the exhaust you can leave the flanges on the exhaust a little loose so some of the air escapes:naughty:
Your in CA so your main smog points are EGR, and the two cats. I would check those...and make sure your car is in correct timing as well.
If the shop tests from the end of the exhaust you can leave the flanges on the exhaust a little loose so some of the air escapes:naughty:
Your in CA so your main smog points are EGR, and the two cats. I would check those...and make sure your car is in correct timing as well.
Is the O2 sensor new? Clean air filter,change plugs,change oil,make sure all vacume hoses are in good condition,make sure its timed right
There are several oxides of nitrogen, hence the name NOx. NOx is caused by combustion temps over 2000 F where the normally stable N2 combines with the O2. Anything that causes high combustion temps will generate NOx. Cooling system problems, timing, a slightly lean mixture, ect. NOx generation is near maximum at a stoch mitxure so anything leaner will cause it to go up in even a healthy engine.
As jdub pointed out the egr system's sole purpose is to reduce NOx. It's further lowered by the reduction bed in your 3 way cat. It'd help if you posted the emissions report numbers and at what point on the ASM test the car failed.
As jdub pointed out the egr system's sole purpose is to reduce NOx. It's further lowered by the reduction bed in your 3 way cat. It'd help if you posted the emissions report numbers and at what point on the ASM test the car failed.
NOx, makes sense,anyways, the emissions is actually in a 2003 Lotus Elise, it passed at higher speeds, but at idle the NOx levels were high, i dotn know the exact numbers at hand
NOx is used to refer to all oxides of nitrogen in emmisions, there are numerous combinations. NOx emissions rise with high combustion temperatures, and since the egr is used to help reduce those temperatures, there's a good chance that it is the problem.
edit: Looks like I post too slow.
edit: Looks like I post too slow.
JustAnotherVictim
Supramania Contributor
It's OK lanternman....nobody much believes anything I write anyway so it's nice to have a backup 
Yeah, if it's a 2003 why is it getting tested? And what do you mean at "idle"? There is no idle on the ASM test unless he lives in a non-enhanced area. What county is he in?
Yeah, if it's a 2003 why is it getting tested? And what do you mean at "idle"? There is no idle on the ASM test unless he lives in a non-enhanced area. What county is he in?
JustAnotherVictim
Supramania Contributor
Yea, should be 15mph and 25mphjetjock said:It's OK lanternman....nobody much believes anything I write anyway so it's nice to have a backup
Yeah, if it's a 2003 why is it getting tested? And what do you mean at "idle"? There is no idle on the ASM test unless he lives in a non-enhanced area. What county is he in?
He bought the car in Italy and brought it back with him when he came back to the states, it is now in California and it needs to be tested before it can be registered, what the DMV said...
By idle i meant the slower speed, i really dont pay much attention to emissions so i guess the 15mph was the one that failed the NOx test
Ok, looks like he was caught by the last paragraph. This is because cars built for sale outside CA are different. "Federal" cars for example. But Italy? Does the car even have EGR?
*edit* I just checked the software on one of my gas analyzers and it has Italian emission specs in there. Not surprising since the thing was made in Italy. Pretty strict too so I'd think the car would have decent emissions systems
Vehicles exempt from the Smog Check program:
Beginning January 1, 2005, vehicles 6 or less model-years old are exempt from the biennial Smog Check inspection requirement. For vehicles with registration renewals due in the 2006 calendar year, this exemption includes model-years 2001, 2002, 2003, 2004, 2005 and 2006.
Beginning January 1, 2005, vehicles 4 or less model-years old are exempt from the Smog Check inspection requirement upon change of ownership and transfer of title transactions with DMV. In 2006, this exemption includes model-years 2003, 2004, 2005 and 2006.
Beginning April 1, 2005, vehicles being initially registered in California that were previously registered in another state are exempt if the vehicle is a 1975 and older model-year vehicle.
Newer vehicles, the first 6 model years, are not exempted upon initial registration in California. These vehicles are required to undergo a Smog Check Inspection.
*edit* I just checked the software on one of my gas analyzers and it has Italian emission specs in there. Not surprising since the thing was made in Italy. Pretty strict too so I'd think the car would have decent emissions systems
Vehicles exempt from the Smog Check program:
Beginning January 1, 2005, vehicles 6 or less model-years old are exempt from the biennial Smog Check inspection requirement. For vehicles with registration renewals due in the 2006 calendar year, this exemption includes model-years 2001, 2002, 2003, 2004, 2005 and 2006.
Beginning January 1, 2005, vehicles 4 or less model-years old are exempt from the Smog Check inspection requirement upon change of ownership and transfer of title transactions with DMV. In 2006, this exemption includes model-years 2003, 2004, 2005 and 2006.
Beginning April 1, 2005, vehicles being initially registered in California that were previously registered in another state are exempt if the vehicle is a 1975 and older model-year vehicle.
Newer vehicles, the first 6 model years, are not exempted upon initial registration in California. These vehicles are required to undergo a Smog Check Inspection.
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Not quite sure what that is saying but the issue is that we have to get it to pass smog to register it, he comes home on the twenty first so we would like to have it registered by then, but we need to lower the NOx emissions, so my question is;
How do you check the EGR system?
What else can i replace, adjust to lower the NOx emissions?
Im not sure but this car may be within the first 6 model years, im not positive though, its not my car so i never realyl payed attention...
How do you check the EGR system?
What else can i replace, adjust to lower the NOx emissions?
Im not sure but this car may be within the first 6 model years, im not positive though, its not my car so i never realyl payed attention...
Does't matter what model year it is. The 6 year provision doesn't apply to him because it came from out of state.
The EGR valve itself can be checked by applying vacuum to it and seeing if the engine runs rough or stalls. I'm not familair with the EGR controls on a Elise so can't help you there. Either bring it to a mech or pay the $450 in repairs to get a waiver. Nice car btw, I used to own a Lotus and still own another car engineered by them. Not a car for someone who can't work on them though. They'll eat you alive.
The EGR valve itself can be checked by applying vacuum to it and seeing if the engine runs rough or stalls. I'm not familair with the EGR controls on a Elise so can't help you there. Either bring it to a mech or pay the $450 in repairs to get a waiver. Nice car btw, I used to own a Lotus and still own another car engineered by them. Not a car for someone who can't work on them though. They'll eat you alive.
JustAnotherVictim
Supramania Contributor
I always wanted to try the Espirit Twin turbo V-8? That has my attention.
Good luck with the smog.
Good luck with the smog.