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by Joske Vermeule, September 1
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Jun 14th, 2026
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Joined: Feb 2011
Posts: 1,500 Likes: 2
Talk Morgan Enthusiast
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OP
Talk Morgan Enthusiast
Joined: Feb 2011
Posts: 1,500 Likes: 2 |
Worked on a friends 89 Plus 8 yesterday. He had a long punch list. Fixed what we could but there were a few things beyond my abilities to correct. He needs to have his offside Armstrong shock rebuilt. Leaking badly and his car dies at a light or stop. My guess was the ECU? Rebuild as well. Thoughts??
After a day a mucking about with grease, we took the 89 Plus 8 and my 86 Plus 8 out to a pub for dinner and a pint. About a 10 mile drive.
Cheers,
Mark
1934 SS MX4
1938 Series 1 DHC
1951 Plus 4
2005 Roadster
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Joined: Apr 2010
Posts: 463
Learner Plates Off!
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Learner Plates Off!
Joined: Apr 2010
Posts: 463 |
Dave
98 +8 Corsa Red
74 MGB Red
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Joined: Feb 2011
Posts: 1,500 Likes: 2
Talk Morgan Enthusiast
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Talk Morgan Enthusiast
Joined: Feb 2011
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Hi Dave, yes I do enjoy a day in the garage!! And always better with friends!
Cheers,
Mark
Mark
1934 SS MX4
1938 Series 1 DHC
1951 Plus 4
2005 Roadster
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Joined: Jun 2014
Posts: 12
New to Talk Morgan
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New to Talk Morgan
Joined: Jun 2014
Posts: 12 |
Hi, the stalling at stop was a feature of a 93 Discovery I had some years ago. It was a 3.5 but don't know which type of EFI it had. The problem turned out to be a faulty vacuum canister/diaphragm on the distributor.
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Joined: May 2011
Posts: 4,896
Drive on the Wild Side Part of the Furniture
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Drive on the Wild Side Part of the Furniture
Joined: May 2011
Posts: 4,896 |
Worked on a friends 89 Plus 8 yesterday. He had a long punch list. Fixed what we could but there were a few things beyond my abilities to correct. He needs to have his offside Armstrong shock rebuilt. Leaking badly and his car dies at a light or stop. My guess was the ECU? Rebuild as well. Thoughts?? .
, ECU not likely IMH, more likely to be the stepper motor on the flap valve that controls the air coming into the engine. The stepper has 100 segments and these can get dirty and give voltage miss-readings, then the ECU does not know where the throttle position is. When no throttle it needs to be 3.5v, if I recall correctly. Initially I would remove and clean with electrical contact spray, refit making sure voltage at closed is correct. Hope this helps.
Adrian
Buggered Off, to a modern none leaky car, heart's still ticking
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Joined: Feb 2011
Posts: 1,500 Likes: 2
Talk Morgan Enthusiast
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OP
Talk Morgan Enthusiast
Joined: Feb 2011
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Good thoughts!! Thanks,
Cheers,
Mark
1934 SS MX4
1938 Series 1 DHC
1951 Plus 4
2005 Roadster
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Joined: Jul 2007
Posts: 27,813 Likes: 749
Member of the Inner Circle
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Member of the Inner Circle
Joined: Jul 2007
Posts: 27,813 Likes: 749 |
JohnV6
2022 CX Plus Four
2025 Renault Scenic Alpine etech "Yvette"
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Joined: Jan 2013
Posts: 2,361
Talk Morgan Expert
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Talk Morgan Expert
Joined: Jan 2013
Posts: 2,361 |
From experience on running a clas b v8, I would simply remove the idle control valve and give it a good clean with carb cleaner
Instagram - WilliamsMotorsportuk
- Lawrie Mills(Chunkylozza)
Youtube - ChunkyLozza
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Joined: Feb 2016
Posts: 30
Just Getting Started
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Just Getting Started
Joined: Feb 2016
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Tom.G.
2008 Aero 8 S4 auto. Grey
1960 Greeves
1957 Ariel Sq Four
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Joined: May 2011
Posts: 4,896
Drive on the Wild Side Part of the Furniture
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Drive on the Wild Side Part of the Furniture
Joined: May 2011
Posts: 4,896 |
Worked on a friends 89 Plus 8 yesterday. He had a long punch list. Fixed what we could but there were a few things beyond my abilities to correct. He needs to have his offside Armstrong shock rebuilt. Leaking badly and his car dies at a light or stop. My guess was the ECU? Rebuild as well. Thoughts?? .
, ECU not likely IMH, more likely to be the stepper motor on the flap valve that controls the air coming into the engine. The stepper has 100 segments and these can get dirty and give voltage miss-readings, then the ECU does not know where the throttle position is. When no throttle it needs to be 3.5v, if I recall correctly. Initially I would remove and clean with electrical contact spray, refit making sure voltage at closed is correct. Hope this helps. Wrong voltage I think it's 0.3v at idle, check it out to be sure.
Adrian
Buggered Off, to a modern none leaky car, heart's still ticking
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