CO-Value to high at 302, 2150 2V Feedback carb

Hi,

I have the problem that the CO value is too high when idling ~ 7% (max. 3.5% allowed).
Otherwise the engine runs very well, the spark plugs also look good, as does the petrol consumption.
Can you set something on the carburetor 2150 FB that makes the mixture lean when idling? Or what else can it be (lambda probe, catalyst blocked?)

Thank you
Ralph

Hello Ralph!

Do you know if your A.I.R. injection pump is working correctly and that the bypass valve is closed?

These trucks use air injected after the combustion cycle to "burn off" excess CO

OK! I will check airflow.
Thanx