Dave, interesting info
My Roadster passed it's test today & I was just comparing last year
emissions whilst I file the test cert (which is a recipe for forgeries,
there's no special text, or watermark & it's just printed on white
photocopier paper - bonkers)
Lambda this year 1.03
Last year 1.025
2010 1.024
2009 1.018
Do they 'wear' out ? or is it just with price watching on petrol, I put more
supermarket stuff in than I used to ?
Although it's the first test since being 'chipped'
Regards,
Jon
_____
From: Dave Wellings [mailto:[email protected]]
Sent: 22 May 2012 20:29
To: mogtalk2
Subject: [mogtalk2] Sweating at the MOT
Some of you will no doubt know all about this, but here is my story from
yesterday, just posted on Talkmorgan.
MOT today. The form has now been dumbed down. Instead of the green hard to
forge certificate, it's a simple white page print out, with any advisories
on the right hand side.
What's more interesting, and worrying is the Lambda requirement. This
measures the fuel/air ratio at the tailpipe, and is between two parameters,
which for my Morgan is (allegedly) 0.9 to 1.03. This is a very narrow band.
On the screen, this displays as a red band with a narrow green pass band.
The measure is shown as a white bar, and is taken at a prescribed 'fast
idle' - just under 3000rpm. It was a struggle to get below 1.03. After a
couple of attempts the tester managed 1.025. A high reading indicates a leak
in the exhaust system, but both tailpipes produced the same effect. There is
no obvious leak, but the Lambda shows a weak mixture.
On checking last years result, it was 1.024, so that was right at the top
end. The machine can't be conned, so exceed the limit and you will fail.
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