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SORN
by OldSkrote - 31/07/25 02:07 PM
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New
by Rex_tulips - 30/07/25 07:59 PM
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Forums34
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Aug 24th, 2023
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Joined: Feb 2012
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Just Getting Started
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OP
Just Getting Started
Joined: Feb 2012
Posts: 57 |
My Duratec engined +4 just failed its MOT on missions. It had a HC level of 279 at fast idle (limit 200) and a CO of 3.85 (limit 0.3) and at idle a CO of 8.16 (limit 0.5).
Apart from losing some crispness to the exhaust note through being too rich, there is no notable change in running or performance.
The OBD put a question over the lambda before the CAT, but changing that didn't make any difference. The CAT look OK?
Anyone got any ideas?
Mike Hughes
1969 4/4 competition (ST170)
2008 +4
1962 Vitesse 6 Formosa
1959 Peerless GT2
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Formerly known as Aldermog Member of the Inner Circle
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Formerly known as Aldermog Member of the Inner Circle
Joined: Aug 2013
Posts: 15,794 Likes: 14 |
Something very wrong...
My old 1991 Mercedes 190 2.6 with NO cat didn't produce pollution like that, especially the CO.
No sensible suggestions other than take it to a Ford engine specialist....
Peter,
66, 2016 Porsche Boxster S
No longer driving Tarka, the 2014 Plus 8...
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Talk Morgan Addict
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Talk Morgan Addict
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I trust they had it super hot? That helps but probably won't be enough, to be honest those figures point to a Lambda probe failure. The other thing that might be worth considering is the fuel pressure regulator, not sure if you know but the amount of fuel injected is a combination of the injector pulse duration and fuel pressure in the rail, one overlooked area is a faulty pressure regulator. There is a schrader valve for checking the line pressure and any decent garage should be able to check for you, sorry but don't know the Ford figure but reference to one of their dealers should be able to quote the figure. The adaptive shift will try and adjust the pulse width of the injectors until it reaches its pre set limit then it will pop a MIL light on and store a code.
Last edited by Spanner Juggler; 18/05/15 05:07 PM. Reason: I hate spellcheck changing words, I really did mean Schrader not header ;-)
BR Colin
Who used to be a Spanner Juggler
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What exhaust system do you have fitted?
By the way this should be in the Maintenance & Servicing forum.
Last edited by Gambalunga; 18/05/15 05:40 PM.
Peter ![[Linked Image]](http://bradley.it/public_images/drive.jpg)
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Joined: Feb 2012
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Just Getting Started
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Just Getting Started
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Thanks Colin, They did get it hot and I have changed the lambda, but no improvement, I'll look at the fuel pressure, thanks for the suggestion.
Mike Hughes
1969 4/4 competition (ST170)
2008 +4
1962 Vitesse 6 Formosa
1959 Peerless GT2
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Joined: Feb 2012
Posts: 57
Just Getting Started
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OP
Just Getting Started
Joined: Feb 2012
Posts: 57 |
Just to close this out, my car is fixed and flew through the retest with a CO of 0.004 at idle.
The culprit was the EVAP valve that recycles the fuel tank vapour into the combustion line. It was struck open and causing both the emissions and the rough idle.
Thanks to those who offered constructive help.
Rgds
Mike
Mike Hughes
1969 4/4 competition (ST170)
2008 +4
1962 Vitesse 6 Formosa
1959 Peerless GT2
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Joined: Jul 2011
Posts: 3,643
Talk Morgan Addict
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Talk Morgan Addict
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That is great news and a really low reading with the fix.
Ian
2011 Plus 4
Wild Mogs Reims 2019, Goodwood 2018, Isle of Man 2017, Carried on to Caramulo" 2016
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That is great news and a really low reading with the fix. +1. Following on from your MOG Talk post have you tried Burton Power for the replacement part?
Richard
1976 4/4 4 Seater
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An issue easily avoided by fitting throttle bodies  The EVAP valve is removed and the tube blocked off (don't tell anyone though)
Peter
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