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

2007 CHEVROLET CAVALIER
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JACKZULLO
  • MEMBER
  • 1 POST
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 7:37 AM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,992 POSTS
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 9:24 AM
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