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Join Date: Sep 2020
Posts: 1
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Smog Problems
Good Day, my 1985 Carrera has failed California Smog testing 3 times recently. I’ve had a smoke test done and no leaks were discovered. I’ve run a fuel additive through one complete tank of gas and the most recent Smog Test failure showed very high NOx readings. It seems that I may have to replace the Catalytic Converter and/or Oxygen Sensor. Any advice or solutions. Frustrated.
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09-28-2020, 03:36 PM
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Join Date: Oct 2001
Location: San Carlos, CA US
Posts: 5,529
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Post your full results ....
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Porsche 2005 GT3, 2006 997S with bore-scoring Exotic: Ferrari F360F1 TDF, Ferrari 328 GTS Disposable Car: BMW 530xiT, 2008 Mini Cooper S Two-wheel art: Ducati 907IE, Ducati 851 |
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09-28-2020, 04:59 PM
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Join Date: Aug 2020
Location: SoCal
Posts: 20
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Failed evap also?
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09-28-2020, 06:39 PM
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Motor must be very hot when you take it in. Also I put 45 pounds of air in the rear tires for less drag while it’s rolling. Change oil. Make sure car is tuned up. Again, real hot motor .
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09-28-2020, 09:19 PM
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Hi
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I believe a high NOx reading indicates running Lean. Could be a vacuum leak.
How many miles on this engine? Can we see the smog check results?
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"A good sense of humor is the best thing to have in your toolbox when working on these cars." Quote by Charles Freeborn, Pelican. |
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09-29-2020, 10:15 AM
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Join Date: Jan 2011
Location: Gulf Coast FL
Posts: 1,485
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High NOx on a car with no EGR system is a bad CAT
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09-29-2020, 01:35 PM
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Join Date: Oct 2014
Location: Bay Area CA
Posts: 39
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Agree; I have an unused CARB-certified cat that I could sell at a discount...
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09-30-2020, 12:07 PM
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Porsche 911 Carrera
Gretchen
