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StephenO
Member Since: 15 Feb 2010
Location: Scotland
Posts: 1651
  
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| MOT/Emissions post EGR's being blanked! |
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I know there has been a lot of talk about EGR's being blanked and how it could affect the emissions. People have posted that their Disco's have passed their MOT but I've not seen any figures on emissions measured.
Sorry if this has been covered but I thought I would spread the good news.
I blanked mine off earlier this year and decided to pull out last years MOT details - well shocked!!!!
Last year - with all EGR componenets in place -
The test limit applied is 1.50 1/m
Absortion coefficient after correction was 0.85 1/m
This year - EGR's blanked -
Absortion coefficient after correction was 0.19 1/m
Don't get me wrong, since I blanked them off I've been using Redex fuel treatments on a monthly basis but this begs the question -
"what is it the EGR system is doing, if it only takes a few Redex treatments to quarter the amount of emissions produced"?
Maybe someone out there has the answer, I'm far from being an expert but the guy at the garage said its one of the lowest results he's seen for this type of car?
Anyone shed any light or is this the norm?
StephenO 
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 21st Jul 2010 9:42 pm |
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gtrhaggart
Member Since: 15 Nov 2009
Location: cambs
Posts: 87
 
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At my last mot the emission test machine couldnt register anything and kept telling the tester to insert the probe so he gave up. Cant get much cleaner than that surely.
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| 21st Jul 2010 10:52 pm |
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Navigator
Member Since: 17 Mar 2010
Location: Stay at Home. One of the lives you save could be your own.
Posts: 5105
 
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The MOT emissions test is done with the engine up to operating temperature _ the EGR valve does it's stuff on a cold engine. You would get quite a different reading if it was taken then. A vaccine does not stop you catching a virus, or passing it on, or getting ill from it, really ill. It does reduce the likelyhood of you dying when really, really ill. Stay Alive - KEEP AWAY FROM PEOPLE.
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| 21st Jul 2010 11:35 pm |
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StephenO
Member Since: 15 Feb 2010
Location: Scotland
Posts: 1651
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Cheers Nav,
But surely the EGR's weren't just fitted for purpose of reducing emissions during cold starts?
I'm just a bit bewildered by the results compared to last year!
StephenO 
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| 21st Jul 2010 11:44 pm |
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Navigator
Member Since: 17 Mar 2010
Location: Stay at Home. One of the lives you save could be your own.
Posts: 5105
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StephenO wrote:But surely the EGR's weren't just fitted for purpose of reducing emissions during cold starts?
A vaccine does not stop you catching a virus, or passing it on, or getting ill from it, really ill. It does reduce the likelyhood of you dying when really, really ill. Stay Alive - KEEP AWAY FROM PEOPLE.
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| 21st Jul 2010 11:45 pm |
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SteveNorman
Member Since: 14 Oct 2005
Location: Somerset
Posts: 1144
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The EGR's operate when hot. Their function is not to reduce the opacity (visible smoke emissions) that the MOT test measures. They are there to reduce the combustion temperature of the cylinders at very specific times while driving. If the combustion temp in the cylinders goes over 1200 degC then oxides of nitrogen are produced, when these come out of the exhaust, they mix with rain, to cause nitric acid (acid rain).
The downside of EGR's is, to reduce the oxygen content in the cylinder (by adding exhaust gas, which can't be burnt again), this increases soot, which in turn increases visible smoke.
So, a blanked EGR runs 'cleaner' in particle emissions (as measured by the MOT) but produces more oxides of nitrogen.
I hope I made that clear & not too complicated.
Newer vehicles which have to meet more & more stringent Euro emission regs are using more & more EGR operation to meet them, hence the close monitoring of EGR position & use by the ecu.
Regards
Steve
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| 22nd Jul 2010 10:11 am |
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bambi
Member Since: 10 Apr 2009
Location: south yorkshire
Posts: 2059
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Good info.
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| 22nd Jul 2010 12:06 pm |
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mack1979
Member Since: 01 Dec 2008
Location: Buckinghamshire
Posts: 70
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It certainly isn't just Disco's with EGR issues. My Mondeo has gone into limp home mode and killed off the turbo a few times because the EGR got coked up, and eventually had to be replaced. It cuts in apparently when you've been doing over 60mph for more than a few minutes (well, that's when mine went into limp home mode, so Steve's information is way clearer than what the garage told me. This is presumably why they're all fitting DPFs to counter the increased soot particle emissions.
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| 22nd Jul 2010 12:18 pm |
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Dave T
Member Since: 03 Jul 2009
Location: Glasgow
Posts: 6902
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A friend has a Mazda 6 that was in and out for ages before they diagnosed the problem as being EGRs. At least we all know the problem straight away Joined the BMWX5 45e group
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| 22nd Jul 2010 12:35 pm |
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The Transformer
Member Since: 22 Jan 2010
Location: Leicestershire
Posts: 1791
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My 57 plate Transit 130bhp requires its second egr after 24k 
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| 22nd Jul 2010 6:56 pm |
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StephenO
Member Since: 15 Feb 2010
Location: Scotland
Posts: 1651
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Cheers Steve,
No longer confused,
Great information, thanks
So if your ever in Scotland where it certainly rains alot, watch out for the "acid rain" if driving behind me!!
StephenO 
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| 22nd Jul 2010 9:40 pm |
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NJF
Member Since: 05 Oct 2007
Location: Gone
Posts: 2466
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These discussions always leave me scratching my head. If the official MOT manual is as simple as it seems (see here) then how can EGR removal ever risk a failure? Never, surely? And even if the car was designed to Euro IV standard or higher, the test that is performed at MOT stations doesn't fully examine the European emission standards. In fact, no country in Europe tests cars in circulation to these standards. Correct?
This is not an idle question. I'm going to have my EGRs blanked and the butterfly removed before they fail and I'd very much like to think that will be the last time I have to think about them. I'd hate to have to pay to have them refitted.
Sorry to roll out this old hamster wheel again.
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| 31st Jan 2011 10:46 pm |
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SteveNorman
Member Since: 14 Oct 2005
Location: Somerset
Posts: 1144
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Correct, as per my post previously
Regards
Steve
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| 1st Feb 2011 7:19 am |
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