2007 Chevy Cavalier My car failed a smog test due to NO and

2007 CHEVROLET CAVALIER
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JACKZULLO
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Engine Cooling problem
2007 Chevy Cavalier 4 cyl Two Wheel Drive Manual 182xxx miles

The cooling system leaks, and I brought the car to be smog tested without fixing the leak. The thermostat was running at 75 % temperature, instead of the normal 15 %. Would this have created the failure in a car that had recently passe emissions?
Apr 7, 2009 at 2:37 PM
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RASMATAZ
  • ✓ASE Certified Mechanic
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  • ASE Certified Mechanic
An engine that's overheating and an EGR valve that's not opening will raise the combustion temperature and increase the formation of oxides of nitrogen.
Apr 7, 2009 at 4:24 PM
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