smart51
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| posted on 6/4/10 at 09:51 AM |
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CAT emissions percentages.
My car went for MOT this morning. Watching the machine, I saw that CO was above 0.2% (about .25%) at fast idle. He revved the car up a bit and the
CO came down but lambda went up out of range. When he dropped the revs, lambda and CO were good for 2 or 3 seconds and then CO went up to 0.25%
again.
Now the car is 16 years old so doesn't have to pass the BET so got a tick on the MOT tester's check sheet but I'm interested why
lambda should be too high when revved and CO too high at fast idle. What do you think?
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matt_claydon
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| posted on 6/4/10 at 01:57 PM |
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When you say lambda went up when revved, do you mean while the revs were increasing, or whilst held at a steady 2-3000 rpm?
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smart51
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| posted on 6/4/10 at 02:38 PM |
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when revved at 4000-5000 (red line at 8500) lambda went up to about 1.1 as far as I could read. when held in the 2000-3000 band, lambda was in the
green but CO went up above 0.2.
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