Higher smog test NOx at 1610rpm(25mph) than that at 1670rpm(15mph)?

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Smog test result shows too high NOx at both 25mph and 15mph, but good higher NOx at 1610rpm(25mph) than that at 1670rpm(15mph), where the engine generate higher gases. what gone wrong? the engine ? the CAT. converter's leaking? or damaged? Thanks for reply.

carzen in Moorpark CA

Feb 5, 2015

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What are the best Chevrolet repair shops?

RepairPal Certified shops can diagnose and repair your 1995 Chevrolet Lumina. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.

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Certified Locations

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Opens 8:00 AM Mon

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Tuffy Tire & Auto Service Center - Grandview

4.7

(89)

2.39 mi

1524 W 5th Ave

Columbus, OH

Closed

Opens 8:00 AM Mon

Call