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beepbeep beepbeep is offline
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Join Date: Jun 2001
Location: Sweden
Posts: 5,565
First of all:

What car are we talking about? Which engine? What EFI? Do you have a lambda sensor and is it working? If you have a catalystic convertor you will probably have a lambda as well. Make sure that lambda is 1.0 during idle and 3500 RPM. If it's not (for example, if car runs rich) your CO values will be elevated.

We need full run on your figures to give you sound advice. The typical emission sniffer will give you CO, NOx, lambda and CO2. We need at least CO and lambda.

Car must run in closed loop during idle and 3500 steady throttle to deliver good CO values with catalystic converter.

Just having a cat and letting it run rich won't help.
Thank you for your time,
Old 10-04-2009, 05:56 AM
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