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PARTMAN
Novice
Jun 11, 2010, 8:57 AM
Post #1 of 12
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Too high to pass CA smog
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 I have a 1991 Buick Regal Ltd with the 3.1L V6. I need to smog it, but it won't pass. The NO's are too high. Everything else comes in good. I put a new Cat on it, because the last on was put on backwards by a muffler shop in Anaheim. My brother keeps telling me a MAP sensor, but he's no trained mechanic. Any suggestions??
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Hammer Time
Ultimate Carjunky
/ Moderator
Jun 11, 2010, 9:40 AM
Post #2 of 12
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Re: Too high to pass CA smog
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Did you mean the NOX or the CO
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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PARTMAN
Novice
Jun 11, 2010, 10:09 AM
Post #3 of 12
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Re: Too high to pass CA smog
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IT'S the NOX
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Hammer Time
Ultimate Carjunky
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Jun 11, 2010, 10:11 AM
Post #4 of 12
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Re: Too high to pass CA smog
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Nox is cause by excessive temperatures in the combustion chamber. The things that elevate it are, timing too far advanced (if adjustable), engine running too hot, EGR system not working properly. Someone would have to determine which of these if any apply to you.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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PARTMAN
Novice
Jul 27, 2010, 4:39 PM
Post #5 of 12
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Re: Too high to pass CA smog
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Ok. so I have now changed to EGR, spark plugs and wires. My NOX came down but still not enough. Any other suggestions would be helpful. What about an O2 sensor?
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Hammer Time
Ultimate Carjunky
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Jul 27, 2010, 4:42 PM
Post #6 of 12
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Re: Too high to pass CA smog
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Did you even read the advice?
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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PARTMAN
Novice
Jul 27, 2010, 4:46 PM
Post #7 of 12
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Re: Too high to pass CA smog
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I did. Had my mechanic check it all, but he only comes up with replacing the EGR.
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Hammer Time
Ultimate Carjunky
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Jul 27, 2010, 4:50 PM
Post #8 of 12
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Re: Too high to pass CA smog
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I've told you what causes NOX. Now you have to determine which one your car is experiencing. It may not be a simple as throwing parts at it and it's certainly not an O/2 sensor
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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PARTMAN
Novice
Jul 27, 2010, 5:01 PM
Post #9 of 12
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Re: Too high to pass CA smog
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thanks for the O2 note, back to the drawing board now
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Loren Champlain Sr
Veteran
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Jul 28, 2010, 5:17 PM
Post #10 of 12
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Re: Too high to pass CA smog
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Re-read HT's post. NOx is created from heat. The EGR system introduces inert exhaust gasses to LOWER combustion temperatures. Make sure that the EGR system is working. Just replacing the valve may or may not correct the problem. Passageway clean? Engine temperature normal? Thermostat, cooling fans, radiator, ect., must all be working properly. Low octane fuel creates heat. Excessive carbon build-up.
Loren
SW Washington
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PARTMAN
Novice
Sep 9, 2010, 5:05 PM
Post #11 of 12
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Re: Too high to pass CA smog
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I finally got it pass the dumb state crap. Not sure what actually did it, but two cats later, aN O2 sensor, and a front fuel system clean out. All told between parts, labor, and smog checks... about $500.00. anybody what to buy it now????
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Sidom
Veteran
/ Moderator
Sep 9, 2010, 8:02 PM
Post #12 of 12
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Re: Too high to pass CA smog
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Hell no!!!!!! Word on the street is....that car is a smog nightmare..... 
Glad to hear you finally got things worked.....Thx for letting us know.....
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