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Wales
by Joske Vermeule, September 1
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Jun 14th, 2026
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Joined: Nov 2015
Posts: 19
New to Talk Morgan
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OP
New to Talk Morgan
Joined: Nov 2015
Posts: 19 |
My 3 Wheeler engine has recently started to cut out unpredictably at most speeds, either with power on or overdrive. it does not do this when idling. Just an instant cut out, no sign of rough running or back firing. This seems to happen every 30-40 km. No dash warning lights observed. The total mileage is 6,000 km.
It won't restart on the starter if I leave the ignition on. However it restarts instantly if I turn the the ignition key off & on. With experience I have found that at motorway speeds I can restart instantly by leaving the car in gear & the clutch engaged & quickly turning the ignition key off & on. The immobiliser hasn't engaged with these adventures.
I have been back to the Sydney service agent who have checked the car & are nonplussed. Have checked all the obvious things like wiring connections & fuses.
It is always an adventure driving my 3 Wheeler but the sudden loss of power can be rather stressful for a 91 year old.
Hoping someone can suggest a solution.
Happy motoring,
Ken.
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Joined: Nov 2012
Posts: 242 Likes: 10
L - Learner Plates On
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L - Learner Plates On
Joined: Nov 2012
Posts: 242 Likes: 10 |
Ken: When I grow up I want to be be like you.. Sorry that i can't help with the engine thing, but it sounds electrical.
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Joined: Aug 2013
Posts: 1,562
Talk Morgan Enthusiast
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Talk Morgan Enthusiast
Joined: Aug 2013
Posts: 1,562 |
Did your service agent check for ECU fault codes?
You say the immobilizer hasn't engaged - how are you arriving at that?
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Joined: Feb 2016
Posts: 8,684 Likes: 413
Needs to Get Out More!
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Needs to Get Out More!
Joined: Feb 2016
Posts: 8,684 Likes: 413 |
As the immobiliser is an option, the wiring diagram shows a (shorting?) plug C47, to be fitted to the immobiliser connector when not specified. Assuming your dealer is aware of this and has the correct plug, it would be a simple task to electrically remove the immobiliser and so identify if its the cause of the issue.
Richard
2018 Roadster 3.7
1966 Land Rover S2a 88
2024 Royal Enfield Guerrilla 450
1945 Guzzi Airone
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Joined: Jul 2013
Posts: 3,732 Likes: 79
Talk Morgan Addict
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Talk Morgan Addict
Joined: Jul 2013
Posts: 3,732 Likes: 79 |
Possibly one of the 4 relays by the fusebox. Try swapping them around and see if that helps.
PaulR had a similar problem.
Red Leader 
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Joined: Oct 2016
Posts: 132 Likes: 1
L - Learner Plates On
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L - Learner Plates On
Joined: Oct 2016
Posts: 132 Likes: 1 |
Yes mine behaved in exactly the same way, no immobiliser on mine
KH traced it to the engine start and ignition relay, worn contacts, so that was replaced and is ok now.
Relay details are on the M3W alternative parts list
PaulR
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Joined: Jul 2019
Posts: 5,447 Likes: 469
Charter Member
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Charter Member
Joined: Jul 2019
Posts: 5,447 Likes: 469 |
Sorry I have ZERO M3W experience and have no definite answer to your issue, though it would seem to me that your process of overcoming the fault may be similar to re-booting a PC, though in this case you are performing a similar action on the ECU...?
Given the many variables in such situations in a digital Morgan, without access to the logic of the operation as written into the ECU chances are that anyone might come up with a considerable number of theories relative to your issues...? Were my Morgan digital, I would consider having access to fault code readout the most important item to have beyond the ign key, and as such it should ideally be available on my mobile phone...?
Your process of re-booting the ECU on the move causes concerns assuming there is a steering lock built into the ignition lock..? Be safe.. and I hope you resolve your issue soonest..
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