Quote:
Originally Posted by cesare
I have a 1979 450SL. I had to take my car to test only smog station. I drove it on the freeway for 1/2 an hour, checked the air filter, etc. It failed the NO. The max No at 15 mph is 1277 mine measured 1932. At 25mph the max is 1137 mine measured 1706. Any ideas out there on what caused the high readings and failure?
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The warmer the car is, the higher the NO readings you'll get. How did you do on the HC and CO2? Mine did great on those, but was borderline on the NO readings. I passed, but I took it back later and had them do a test-only (no report) on the car without doing the long, hard freeway trip I'd done first. I was just at operating temperature, and I didn't let it idle while I waited for him to hook it up. I passed with flying colors on everything. The NO readings were just over 1/2 what they had been.