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Jun 14th, 2026
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Joined: Oct 2016
Posts: 1,544 Likes: 1
Talk Morgan Enthusiast
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Talk Morgan Enthusiast
Joined: Oct 2016
Posts: 1,544 Likes: 1 |
An immobiliser bypass plug is available from Morgan! but i think the throttle position sensor is the way to go first as Chris99 say's 
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Joined: Mar 2014
Posts: 1,737 Likes: 55
Talk Morgan Enthusiast
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Talk Morgan Enthusiast
Joined: Mar 2014
Posts: 1,737 Likes: 55 |
As a quick check:
Stuck throttle - fuel pump and starter work but no spark
Inertia cutout - no fuel pump but starter works
Imobiliser active - no fuelpump or starter.
If you've reset the throttle position I'd check what the default initial value should be, or maybe try it at 0%?
If this fails you may be looking at an ECU or indicator module problem. Useful checklist there Chris.  If only we could make this kind of info 'sticky' on TM!
Andy
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Joined: May 2011
Posts: 1,625 Likes: 25
Talk Morgan Enthusiast
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Talk Morgan Enthusiast
Joined: May 2011
Posts: 1,625 Likes: 25 |
You say you can smell fuel with the plugs out but have you checked the fuel pressure at the test port on the top of the engine, it should be 58psi or thereabouts.
2021 M3W
2013 M3W - Sold
1971 4/4 2 Seater
1934 Sports
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Joined: May 2019
Posts: 60
Just Getting Started
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OP
Just Getting Started
Joined: May 2019
Posts: 60 |
... but have you checked the fuel pressure at the test port on the top of the engine, it should be 58psi or thereabouts. honestly, not - but without sparks firing i' afraid the best fuel pressure doesn't help ;-)
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Joined: May 2019
Posts: 60
Just Getting Started
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OP
Just Getting Started
Joined: May 2019
Posts: 60 |
Stuck throttle - fuel pump and starter work but no spark at the moment that's my default behaviour ;-) also without stucking the throttle ...
Inertia cutout - no fuel pump but starter works
Fuel pump is working anytime (after ingnition on). What I'm wondering: starter sometimes works without deactivating the immobilizer via Dongle , sometimes not ...
Imobiliser active - no fuelpump or starter.
there is a bunch of cables from/to the immobilizer, i'm afraid they are cutting more than only pump and starter .. ? I will measure this tomorrow, using the wiring plan this is now possible.
If you've reset the throttle position I'd check what the default initial value should be, or maybe try it at 0%?
Verified that today. The throttle position displayed in ProTune is 10%, 0,31V , exactly the values I'd seen before , where the engine was runnig properly . So that seems not to be the problem.
If this fails you may be looking at an ECU or indicator module problem.
The ECU is 'talking' with proTune and shows no faults, what is the indicator module ?? Thanks for your help !
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Joined: May 2019
Posts: 60
Just Getting Started
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OP
Just Getting Started
Joined: May 2019
Posts: 60 |
I made a "bypass" plug so that at least could get mobile if such was to happen again
which cables you are bypassing ? And where you can plugin your plug ? Or did you replace the Immobilizer modul by this plug ? Good Idea btw.... ;-) Thorsten
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Joined: May 2019
Posts: 60
Just Getting Started
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OP
Just Getting Started
Joined: May 2019
Posts: 60 |
Is there something that can be plugged into the OBD Port to diagnose such problems?
You can connect an M$ Laptop with S&S Protune software installed via USB to the ECU. This allows you to read a lot of live data and to read and delete faults and warnings stored in the ECU. But in my case , there is nothing faulty, the ECU means evrything is ok. ;-)
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Joined: Feb 2019
Posts: 3,857 Likes: 2
Talk Morgan Addict
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Talk Morgan Addict
Joined: Feb 2019
Posts: 3,857 Likes: 2 |
Is there something that can be plugged into the OBD Port to diagnose such problems?
You can connect an M$ Laptop with S&S Protune software installed via USB to the ECU. This allows you to read a lot of live data and to read and delete faults and warnings stored in the ECU. But in my case , there is nothing faulty, the ECU means evrything is ok. ;-) Darn, another computer dedicated to one thing. I have no Microsoft stuff anymore and have not missed them, but this might be an exception.
2019 M3W Sold and is now in Las Vegas enjoying the showgirls :-)
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Joined: Aug 2011
Posts: 398 Likes: 1
Learner Plates Off!
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Learner Plates Off!
Joined: Aug 2011
Posts: 398 Likes: 1 |
On my unit a number of circuits go into and out off the immobiliser unit via white plug.
You can see the wiring and plug unit on the wiring diagram in the M3W parts book. Page 66
The bypass plug simply rerouted the ins to the outs.
Morgan can supply this plug. Your local dealer may have some spare as I believe they are used during delivery transportat.
I had difficulty getting the right plug style, found one online finally, so probably easier to ask a dealer
Last edited by P964; 23/06/19 04:19 AM.
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Joined: Feb 2019
Posts: 3,857 Likes: 2
Talk Morgan Addict
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Talk Morgan Addict
Joined: Feb 2019
Posts: 3,857 Likes: 2 |
It seems like that elusive part and its source should be in the parts book here on TM.
2019 M3W Sold and is now in Las Vegas enjoying the showgirls :-)
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