Too much CO at idle. Why?
 

I know the thermostat may be involved. It's stuck open. I was looking for any other ideas. For an emissions exemption in WA, you have to prove that you've paid an ecology certified expert at least $150 to diagnose and attempt to repair the problem. Unfortunately, all the ecology gurus are rotary morons. I guess I can shell out the money and hope for the best though. Any thoughts. I haven't a compression tester, so I'm not sure on that, but she pulls very hard well past red line, and never stumbles. Plus, everything else checks out far cleaner than the requirements.

This is affecting my legality, so any help would be great.

Look,the general principles for emissions are as follows:
high HC--poor ignition,combustion
high CO--rich mixture
high NO--lean mixture,high combustion temperature
So yes,if your thermostat is stuck open and you are running cool you will run rich.If you have an 86-88 you can lean out the idle mixture with the variable resistor kindly provided by Mazda.
You can replace the thermostat for $15,do it and use a Mazda T-stat.

Thanks. I knew it was involved, but didn't know if there was more to worry about. Is the variable resistor in the FSM or Haynes? I'll call the local dealership for the T-stat tomorrow, but I'd like to know where to look for info on the resistor. Thanks again.

http://iluvmyrx7.com or http://www.fc3s.org as in free download of factory service manuals. Download the FUEL sections.