Author
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Topic: i need some smog help
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Cm4hawks
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Member # 5231
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posted
My fiancees brother went to smog his ruck today and they told him his N O PARTS PER MILLION WERE TOO HIGH 999 WAS MAX HIS WAS 1238 WHAT CAUSES THAT?? WHAT CAN WE FIX?
-------------------- 2007 Ford Expedition 2004 Dodge Ram 2500
Posts: 1818 | From: Pacheco CA | Registered: Jan 2005
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Curt
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Member # 6254
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posted
I think its too rich but im not positive, change the o2 sensors and the egr if you have one, put in a can of GTP and drive it like a rental, leve it running at the shop and you MIGHT make it
-------------------- '90 GT '94 Toyota 4wd "It have problem" '56 F100 5.8 AFR185's Vortech SC S-trim
Posts: 866 | From: Monterey/Rocklin | Registered: Nov 2005
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88DroptopGT
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Member # 2535
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posted
More information on the vehicle being smogged would help immensely.
From what I remember, high Nox ppm measured values come from high combustion temperatures.
Symptoms that would cause this would be retarded timing, lean a/f, or your cooling system isn't working properly.
Check your EGR system also. I have seen clogged intakes and dirty EGR cut off the recirc during idle and fail people.
Good luck.
Posts: 3978 | From: 707 | Registered: Mar 2003
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Mrk50LX
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Member # 5147
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posted
Had simular problem with my 92 LX Mustang Had to replace the cats and then drive it for a while (few days) before retesting. Then pass with no problems
-------------------- 92 LX conv W/M&M,and Maier Racing Suspension components. MAC Headers and 2.5in MAC exhaust.70mm MAF 65mm Throttle body
Posts: 34 | From: Fremont, CA | Registered: Dec 2004
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88DroptopGT
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Member # 2535
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posted
Yeah check the simple things first.
Posts: 3978 | From: 707 | Registered: Mar 2003
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66 AC COBRA
Nitrous King
Member # 904
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posted
best things you can do
make sure the egr is clean and working properly
change the 02 sensor (last attempt)
drive the piss out of it before you test it, do not turn the car off, you want the cat as hot as possible to burn all that shit, best thing to do is drop by the test station, tell them you will be back in a few minutesand go run the hell out of it for atleast 10 minutes, test immediately after and get the good news
-------------------- FFR AC Cobra 72 Vega - WCHRA Extreme 10.5
Posts: 6280 | From: Winters | Registered: Feb 2002
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MysticJay96
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Member # 5290
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posted
If you can get a hold of all the numbers from that smog test:NOX, CO, HC, O2 and CO2. The first three are the important ones. Generally If you have high NOX you are running lean and the combustion temp is very high (1600 degrees give or take). The higher the temp the more Nox. HC and CO should be low.You may have an intake manifold leak somewhere after the Mass-air flow meter the computer cannot see. As for you're cat being defective, if the truck is OBDII the computer will measure it's efficiency with numbers from both the upstream O2 sensors and downstream sensors. If the numbers are similar you will set a code and the check engine light will turn on and probably flash. Check for manifold leaks first (EGR, hoses, PCV, cracks) and anything else connected to the intake system. Start there and see if you find anything. The smog guys should have told you this stuff after the test was failed.
Posts: 34 | From: San Mateo | Registered: Feb 2005
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