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1987 Plus 8 ECU - Help Request Lucas ECU #697532
06/04/21 09:38 AM
06/04/21 09:38 AM
Joined: Feb 2007
Posts: 94
Aberdeen, UK
PauloAmore Offline OP
Just Getting Started
PauloAmore  Offline OP
Just Getting Started

Joined: Feb 2007
Posts: 94
Aberdeen, UK
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
Re: 1987 Plus 8 ECU - Help Request Lucas ECU [Re: PauloAmore] #697567
06/04/21 01:26 PM
06/04/21 01:26 PM
Joined: Sep 2014
Posts: 1,853
London
MOG 615 Offline
Talk Morgan Enthusiast
MOG 615  Offline
Talk Morgan Enthusiast

Joined: Sep 2014
Posts: 1,853
London
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.
Re: 1987 Plus 8 ECU - Help Request Lucas ECU [Re: PauloAmore] #697569
06/04/21 01:35 PM
06/04/21 01:35 PM
Joined: Dec 2009
Posts: 27,148
Devonshire
+8Rich Offline
Member of the Inner Circle
+8Rich  Offline
Member of the Inner Circle

Joined: Dec 2009
Posts: 27,148
Devonshire
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.


Regards Richard

1999 Indigo Blue +8
2009 4/4 Sport Green prev
1994 Connaught Green +8 prev





Re: 1987 Plus 8 ECU - Help Request Lucas ECU [Re: PauloAmore] #697571
06/04/21 02:11 PM
06/04/21 02:11 PM
Joined: Jun 2019
Posts: 694
Aberdeenshire
Gordon D Offline
Talk Morgan Regular
Gordon D  Offline
Talk Morgan Regular

Joined: Jun 2019
Posts: 694
Aberdeenshire
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
2013 plus 4, Montreal blue.
Re: 1987 Plus 8 ECU - Help Request Lucas ECU [Re: PauloAmore] #697789
07/04/21 09:32 PM
07/04/21 09:32 PM
Joined: Feb 2007
Posts: 94
Aberdeen, UK
PauloAmore Offline OP
Just Getting Started
PauloAmore  Offline OP
Just Getting Started

Joined: Feb 2007
Posts: 94
Aberdeen, UK
Thank you for your replies (and private message). very much appreciated...

MOG 615, its a flapper PRC4764 i'm afraid.


1987 Morgan Plus 8
Re: 1987 Plus 8 ECU - Help Request Lucas ECU [Re: PauloAmore] #697867
08/04/21 12:31 PM
08/04/21 12:31 PM
Joined: Feb 2013
Posts: 192
north yorkshire
B
B3MOG Offline
L - Learner Plates On
B3MOG  Offline
L - Learner Plates On
B

Joined: Feb 2013
Posts: 192
north yorkshire
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

Re: 1987 Plus 8 ECU - Help Request Lucas ECU [Re: PauloAmore] #697880
08/04/21 01:48 PM
08/04/21 01:48 PM
Joined: Feb 2013
Posts: 192
north yorkshire
B
B3MOG Offline
L - Learner Plates On
B3MOG  Offline
L - Learner Plates On
B

Joined: Feb 2013
Posts: 192
north yorkshire
Paul, quick correction the ecu gets its signal from the coil. sorry for the mistake.

David Byrne


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