Your Chevy P30 may have a defective carburetor. Fuel distribution is
controlled primarily by the carburetor. If any component within the
carburetor is defective air/fuel ratio can be disrupted and result in
incomplete combustion. The presentation of too much fuel will produce high
CO emissions. The presentation of not enough fuel will produce low CO
emissions. If your engine's carburetor is defective you have two options.
You can ask a smog repair station to try and adjust it or you can ask to
have the carburetor rebuilt.
posted by SmogTips Support