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Failed Smog - 92 Civic DX - High HC, CO, and Super High NOx
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01-03-2013, 05:54 PM
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Daox
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I'd start with the timing. Then I'd probably run some seafoam or other injector cleaner through it. Finally, a new O2 sensor probably wouldn't hurt. Check the plugs for proper gapping and the normal stuff with getting a used car.
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