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In Reply to: Re: Catalytic Converter Life? (long) posted by Rob Anderson on March 18, 2001 at 02:05:56:
However, I'm not sure how to adjust idle mix on this car without a CO meter. Could I use the O2 sensor (disconnected from the Motronic) as an indicator? What voltage signature should I aim for -- is it feasible to achieve a setting where sensor voltage "hunts" or should I set it for slightly lean (just below 0.5 V)? Or should I give this to a shop to do?
It's been 23,000 miles since last tuneup, so before I check the idle mix, I will adjust the valves and replace the plugs. maybe that's the culprit for the short catalyst life.
Lastly, here are the CA emissions limits for the 15 mph and 25 mph dyno tests (they no longer look at idle, but run the cars with a load to the drivetrain); looking at my results, the manager of a "test-only" station suggested that the measured results looked like the car was running with a good fuel/air ratio but with an ineffective cat:
15 mph 25 mph
%CO2 (info only) 14.2 14.7
%O2 (info only) 0.5 0.1
HC (ppm)
max allowed 133 83
gross polluter limit 283 233
my test result 125 51
CO (pct)
max allowed .71 .58
gross polluter limit 2.21 2.08
my test result .50 .22
NO (ppm)
max allowed 1020 880
gross polluter limit 1957 1757
my test result 2399 971
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