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Sold
by simon8201 - 09/09/26 01:46 PM
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Wales
by Joske Vermeule, September 1
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Forums39
Topics49,899
Posts838,030
Members9,635
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Most Online1,063
Jun 14th, 2026
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Joined: Feb 2007
Posts: 94
Just Getting Started
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OP
Just Getting Started
Joined: Feb 2007
Posts: 94 |
Hi there.... long time....
Having just revived my 87 Plus 8, my garage is reporting that my Lucas 4 ECU fuel control unit 83986B is lacking an ignition signal.
I would very much appreciate a recommendation for a company to repair that please.
Also - having fitted a wider exhaust, though the car runs within MOT specs, I can taste fuel in my mouth. Perhaps an ECU tweak might help?
With many many thanks in advance,
Paul
1987 Morgan Plus 8
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Joined: Sep 2014
Posts: 2,272 Likes: 7
Talk Morgan Expert
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Talk Morgan Expert
Joined: Sep 2014
Posts: 2,272 Likes: 7 |
Paul
Is your fuel injection "Flapper" (13CUX) or "Hotwire" (14CUX)? I think I have a fault finding manual for the latter , but not for the former.
Andy G
1999 +8 , Indigo Blue.
Ex-John McKecknie/Mike Duncan 1955 +4 racer.
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Joined: Dec 2009
Posts: 37,481 Likes: 989
Tricky Dicky Member of the Inner Circle
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Tricky Dicky Member of the Inner Circle
Joined: Dec 2009
Posts: 37,481 Likes: 989 |
Does Russell @ Revolutions have any contacts he can share with you ? Maybe worth a trawl through this .I notice there are some units for sale on fleabay but they have an "A" suffix and I have no idea how or if that is significant.
2009 4/4 Sport Henrietta
1999 Indigo Blue +8
2009 4/4 Sport Green prev
1993 Con Green +8 prev
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Joined: Jun 2019
Posts: 1,236 Likes: 40
Has a lot to Say!
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Has a lot to Say!
Joined: Jun 2019
Posts: 1,236 Likes: 40 |
Hi Paul
Give Derek a ring at Turriff Auto Electrical, he worked with Lucas until they shut up shop. He might be able to help you out. A Google search will bring them up.
Gordon Duguid
2014 Duratec engine plus 4, Montreal blue.
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Joined: Feb 2007
Posts: 94
Just Getting Started
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OP
Just Getting Started
Joined: Feb 2007
Posts: 94 |
Thank you for your replies (and private message). very much appreciated...
MOG 615, its a flapper PRC4764 i'm afraid.
1987 Morgan Plus 8
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Joined: Feb 2013
Posts: 519 Likes: 59
Talk Morgan Regular
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Talk Morgan Regular
Joined: Feb 2013
Posts: 519 Likes: 59 |
Paul, does the engine start and run? The ecu as far as I can remember gets its signal from the distributor, the ignition side (ie spark) is separate from the ecu which is only for fuelling, try taking the ecu apart and re-soldering the transistor connections they usually show cracks in the solder (dry joint). If all else fails I have a complete set of parts for the flapper from my car that I kept when i changed the lucas system for something modern and more efficient (as well as full fuel and ignition mapping) PM me.
David Byrne
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Joined: Feb 2013
Posts: 519 Likes: 59
Talk Morgan Regular
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Talk Morgan Regular
Joined: Feb 2013
Posts: 519 Likes: 59 |
Paul, quick correction the ecu gets its signal from the coil. sorry for the mistake.
David Byrne
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