Jon
I agree with Martyn. What we used to say was "within the limits of experimental error". A tiny variation over time, but showing progressive weakening of the mixture. Whether that's down to the MAF sensor, or whether a K&N filter would affect it, or whether the Lambda sensors get dirty I have no idea. But 1.018 is damn near perfect..... I'm tempted to clean the sensors, but it's a bit of a pandora's box. Dave _____ From: Jon Mark [mailto:[email protected]] Sent: 22 May 2012 20:59 To: mogtalk2 Subject: RE: [mogtalk2] Sweating at the MOT 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. View posts on The Mail Archive http://www.mail-archive.com/[email protected]/ <https://www.listbox.com/member/?&; 7> Modify Your Subscription <http://www.listbox.com> ------------------------------------------- View posts on The Mail Archive http://www.mail-archive.com/[email protected]/ [http://www.mail-archive.com/[email protected]/] Modify Your Subscription: https://www.listbox.com/member/?member_id=22459785&id_secret=22459785-4a39ddf8 Powered by Listbox: http://www.listbox.com
