Too much CO at idle. Why?
#1
Rotary Enthusiast
Thread Starter
Join Date: Apr 2002
Location: Redmond, WA
Posts: 1,122
Likes: 0
Received 0 Likes
on
0 Posts
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.
#3
Rotary Enthusiast
iTrader: (17)
Join Date: Feb 2001
Location: Pluto
Posts: 878
Likes: 0
Received 0 Likes
on
0 Posts
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.
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.
#4
Rotary Enthusiast
Thread Starter
Join Date: Apr 2002
Location: Redmond, WA
Posts: 1,122
Likes: 0
Received 0 Likes
on
0 Posts
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.
#5
HAILERS
Join Date: May 2001
Location: FORT WORTH, TEXAS,USA
Posts: 20,563
Likes: 0
Received 21 Likes
on
19 Posts
http://iluvmyrx7.com or http://www.fc3s.org as in free download of factory service manuals. Download the FUEL sections.
Thread
Thread Starter
Forum
Replies
Last Post
Donald Hampton
2nd Generation Specific (1986-1992)
5
09-17-15 03:13 PM