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mike100 · 03-05-2012

less than 11% on the C02 is WAAAY too low. when the cats light off and have a decent fuel mixture, you will have 14.5-15% depending on Catalyst health and fuel mixture accuracy. There isn't a limit on C02, it is just easy to measure and used for diagnostic reasons to see if the catalyst is 'running'.

CO is too high..I only had .35% with a big vac leak that wouldn't idle below 1300 rpm. .10% when I fixed it.

That cat did not light-off. It could be bad if you ran with bad injectors for a long time.

03-05-2012	#8
mike100 Join Date: Feb 2011 Location: San Marcos CA Posts: 1,786	Re: CAN'T PASS CALIF. SMOG, IDEAS/HELP!!!! less than 11% on the C02 is WAAAY too low. when the cats light off and have a decent fuel mixture, you will have 14.5-15% depending on Catalyst health and fuel mixture accuracy. There isn't a limit on C02, it is just easy to measure and used for diagnostic reasons to see if the catalyst is 'running'. CO is too high..I only had .35% with a big vac leak that wouldn't idle below 1300 rpm. .10% when I fixed it. That cat did not light-off. It could be bad if you ran with bad injectors for a long time.