| Author |
Message |
wayne skiles (Bad_tt)
Junior Member
Username: Bad_tt
Post Number: 74
Registered: 8-2002
| | Posted on Thursday, September 25, 2003 - 3:15 pm: | |
I can recommend a smog sta/mech
email me |
Hubert Otlik (Hugh)
Intermediate Member
Username: Hugh
Post Number: 1430
Registered: 1-2002
| | Posted on Tuesday, September 23, 2003 - 10:32 pm: | |
you're car is running too hot. the high temps facilitate the production of NO from N2 and O2, the enthaply (or the rxn's thermodynamic viability to convert reactants to products under STP conditions) is + 180kj/mol and b/c it's such an endothermic rxn, the eq. constant favors the reactants; however, under combustion temps, the rxn gets pushed to products (le chatliers principle at work) , and you end up with NO production.
the problem is, once the hot (i.e., 2500 degrees kelvin) gases hit the cold ambient air, the molecule is trapped, and youre stuck with NO polution.
conversly, the fact that your HC (hydrocarbon) readings aren't as elevated (like your NO readings) tends to lend more evidence to the fact that you're running lean; the elevated values of the HC's also infere that your car was too cold when you took it to test (as combustion is grossly inefficent at lower temps), and that your catalytic converter isn't working properly (which is both temp dependant, and catalytic element dependant). elevation of CO is also a sign of cat problems since 80-90% of CO and HC's channeled into the cat should be eliminated if the cat is working correctly, and the car is warmed up.
tune your car to run closer to stochiometric; check your fuel delivery , plugs, fuel filter, replace your cat (if neccessary) , retest when the car is at operating temp., look at o2 sensors , etc etc.
lastly, your car's not that bad, but it seems to be running a little lean (as outlined above), and (if I didn't know any better), you tested the car before it was fully warm (i.e., elevated CO levels).
-hubert |
Patrick Denonville (Arizonaguy)
Member
Username: Arizonaguy
Post Number: 660
Registered: 4-2003
| | Posted on Tuesday, September 23, 2003 - 10:09 pm: | |
rubing alcohol! It works wonders... |
Jordan Witherspoon (Jordan747_400)
Intermediate Member
Username: Jordan747_400
Post Number: 2019
Registered: 12-2002
| | Posted on Tuesday, September 23, 2003 - 8:58 pm: | |
Those seem quite high above the max. Something must be slightly wrong with the smog equiptment. Id take it in a shop and have them dig around the engine for a minute to make sure all the smog equiptment is properly installed and in place. |
Jeremy (Jdb)
New member
Username: Jdb
Post Number: 27
Registered: 4-2003
| | Posted on Tuesday, September 23, 2003 - 8:46 pm: | |
I took my out-of-state 1997 355 to get smogged today, and I failed. It is a California-certified car and passed everything except the actual emissions. I have a Tubi exhaust installed. I had it smogged at Sepulveda West Car Wash & Quick Lube. Here are the results:
15 mph: My HC levels were 88; max. allowed is 52.
25 mph: my HC levels were 59; max. allowed is 36.
15 mph: My CO levels were 54%; max. allowed is 49%.
25 mph: My CO levels were 79%; max. allowed is 46%.
15 mph: My NO levels were 697; max. allowed is 424.
25 mph: My NO levels were 438; max. allowed is 711.
Any thoughts on what is causing this and what I can do to fix it? |
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