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Failed smog..what should I check?

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Joined
Jul 13, 2007
Messages
88
This is for californai emissions...here are results

HC (PPM) at 15 mph
meas..130
Max...110

HC at 25 mph
Meas…92
Max…85

CO (%) at 15 mph
meas .69
max .71

CO at 25 mph
meas .40
max .59

NO (PPM) at 15 mph
meas....1303
max......772

NO at 25 mph
meas...604
max....711
 
Whats your O2 readings. A good working cat should have less than 2 percent o2 at both speeds. If you have high o2 percentage I would say its def. the cat converter.
 
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