carlknight1982
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| posted on 16/4/14 at 02:06 PM |
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Cat cleaner
Ok guys help me out the wife's a3 has failed mot on emissions . Hc co too high, I serviced it a month ago but it does a lot of short runs
No codes coming up to say the lambda or cat is poorly
So I'm thinking it's crap buid up. Do any if the cat cleaners work?
Logic will get you from a A to B
Imagination will take you everywhere.
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MP3C
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| posted on 16/4/14 at 02:18 PM |
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I had my old car (MG ZR) nearly fail on emissions, however the guy at the garage ran the car for about 30 seconds to test it, and as the garage was
only 2 minutes down the road the engine wasn't warmed up properly. When he mentioned it wouldn't pass I said give it another test in 5
minutes after it has warmed up. Passes fine when warm.
So don't know if it was tested with cold engine as that could have been the culprit?
Mat
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carlknight1982
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| posted on 16/4/14 at 02:24 PM |
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It is possible
Logic will get you from a A to B
Imagination will take you everywhere.
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davidimurray
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| posted on 16/4/14 at 03:00 PM |
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I always put Cataclean in my cars before MOT time and make sure they are red hot when I get to the test. Cataclean got me out of one emmissions fail
and I've just continued to use it!
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britishtrident
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| posted on 16/4/14 at 03:19 PM |
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I would agree it probably needs properly warmed up followed by a good blast --- find a long steep hill that you can really hold the throttle
full open on. Then getting the car properly warm before the MOT test is carried out.
If you can get live data on your code reader look at various output -- The important Lambda sensor on a inline 4 cylinder engine the Bank1
Upstream sensor (B1S1) should should look like a bar graph with step changes between about 0.1 v and 0.8v at least once a second. In contrast the
sensor downstream of the cat (B1S2) is only there to check if the emission controls including the cat are working it should show a more or less
steady output.
If your code reader reads live data it will also usually able to show the results of the Emissions Readiness test which will be generated if you
wipe any codes then put the car through a full drive cycle. A full drive cycle is made up of warming the car up properly driving the car at
various speeds. For this test to complete the number of miles at each speed varies between vehicle manufacturer.
9 times out of 10 if car passes the emissions readiness test it will pass MOT.
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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perksy
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| posted on 16/4/14 at 07:08 PM |
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As above, If you can read live data its always a useful insight.
Cataclean is good and it does work, It cured a friends Volvo that had recorded a faulty cat code
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