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Wales
by Joske Vermeule, September 1
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Forums39
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Jun 14th, 2026
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Joined: Feb 2024
Posts: 36 Likes: 4
Just Getting Started
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OP
Just Getting Started
Joined: Feb 2024
Posts: 36 Likes: 4 |
Hi
We are currently on holiday with our morgan and the MIL light came on.
According handbook there should be an issue with the ignition
or fuel system, however the car is running perfectly. Are there
any other issues that activates the MIL ?
Any help much appreciated.
Peter
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Joined: Nov 2015
Posts: 8,696 Likes: 498
Just barreling along Needs to Get Out More!
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Just barreling along Needs to Get Out More!
Joined: Nov 2015
Posts: 8,696 Likes: 498 |
Sometimes filling the tank really full can trip the MIL if the fuel gets into the carbon canister in the breather circuit
Did you refuel recently ?
Jon M
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Joined: Feb 2016
Posts: 8,695 Likes: 415
Needs to Get Out More!
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Needs to Get Out More!
Joined: Feb 2016
Posts: 8,695 Likes: 415 |
An OBD2 code reader will point to the likely cause if the MIL remains.
Richard
2018 Roadster 3.7
1966 Land Rover S2a 88
2024 Royal Enfield Guerrilla 450
1945 Guzzi Airone
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Joined: Jun 2021
Posts: 1,987 Likes: 104
Talk Morgan Enthusiast
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Talk Morgan Enthusiast
Joined: Jun 2021
Posts: 1,987 Likes: 104 |
An OBD2 code reader will point to the likely cause if the MIL remains. Peter, I have one of these https://www.ebay.ch/itm/376399817150. Inexpensive and easy to use (but check that it matches the shape/size of your OBD port). I'll bet you will see code P0627 which is a very common fault in the fuel sender. Just delete the code and that will turn-off the MIL light.
Peter
2009 3-litre Roadster "Ivor", royal ivory / green
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Joined: Jul 2007
Posts: 27,835 Likes: 759
Member of the Inner Circle
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Member of the Inner Circle
Joined: Jul 2007
Posts: 27,835 Likes: 759 |
I bought an obdii dongle and the free torque app. The dongles are on ebay
JohnV6
2022 CX Plus Four
2025 Renault Scenic Alpine etech "Yvette"
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Joined: Feb 2024
Posts: 36 Likes: 4
Just Getting Started
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OP
Just Getting Started
Joined: Feb 2024
Posts: 36 Likes: 4 |
Hi again,
thanks for all the information. I took the car to a garage/workshop and the OBD error code was P0171 (running to lean). I assume the Lambda sensor is telling the ECU to inject more fuel which is more than the typical deviation from the norm.
Anyone else maybe had this issue too ?
Thanks Peter
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Joined: Feb 2016
Posts: 8,695 Likes: 415
Needs to Get Out More!
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Needs to Get Out More!
Joined: Feb 2016
Posts: 8,695 Likes: 415 |
As you suggest Peter maybe the O2 sensor is giving a reading slightly outside the ECU programmed envelope. I would be tempted, if the car is running fine, to clear the code which should also remove the MIL and continue driving. If it does reappear a new sensor may solve the problem.
Richard
2018 Roadster 3.7
1966 Land Rover S2a 88
2024 Royal Enfield Guerrilla 450
1945 Guzzi Airone
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Joined: Feb 2024
Posts: 36 Likes: 4
Just Getting Started
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OP
Just Getting Started
Joined: Feb 2024
Posts: 36 Likes: 4 |
We managed to get home from our holidays without any problems, but the MIL light came on again. I connected my OBD reader and it was the same issue (P0171).
When checking all the live data I have the impression the MAP sensor value is too low (23 kPa @ 1000 rpm). This might be an indication for a little air leak on the inlet side ?
For a comparison, can maybe anyone check what the value should be ? (mine is a +4 / 2006 ).
Thanks in advance,
Peter
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Joined: Jul 2007
Posts: 27,835 Likes: 759
Member of the Inner Circle
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Member of the Inner Circle
Joined: Jul 2007
Posts: 27,835 Likes: 759 |
Easy to check for leaks if you carefully spray carb/inlet cleaner over the pipes after the throttle slide.
JohnV6
2022 CX Plus Four
2025 Renault Scenic Alpine etech "Yvette"
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