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New
by Rex_tulips - 30/07/25 07:59 PM
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Forums34
Topics48,365
Posts813,357
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Most Online1,046
Aug 24th, 2023
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Joined: Mar 2010
Posts: 220 Likes: 1
L - Learner Plates On
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OP
L - Learner Plates On
Joined: Mar 2010
Posts: 220 Likes: 1 |
I hope the competent members of this forum can help me.
All advice will be appreciated.
My 4/4 has a very rough running between 1800-2000 rpms. It seems it gets worse in hot weather or with hot engine. I think it has something to do with the ignition as it feels the same as when the spark plug voids were filled with water after washing my car.
The engine management light comes on. When I use my OBDII reader it states code P1131. I replaced both coil pack and leads in 2018 which improved performance but the rough running remains the same.
Last edited by Geir Karlsen; 27/04/19 10:13 AM.
4/4 2 seater 2001 model
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Joined: Feb 2016
Posts: 7,943 Likes: 218
Talk Morgan Guru
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Talk Morgan Guru
Joined: Feb 2016
Posts: 7,943 Likes: 218 |
O 2 sensor issue. See this
Richard
2018 Roadster 3.7
1966 Land Rover S2a 88
2024 Royal Enfield Guerrilla 450
1945 Guzzi Airone
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Joined: Mar 2010
Posts: 220 Likes: 1
L - Learner Plates On
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OP
L - Learner Plates On
Joined: Mar 2010
Posts: 220 Likes: 1 |
Both O2 sensors were replaced in 2017 as one of them had a failing heating element?
BR
GK
4/4 2 seater 2001 model
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Joined: Feb 2007
Posts: 511 Likes: 1
Talk Morgan Regular
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Talk Morgan Regular
Joined: Feb 2007
Posts: 511 Likes: 1 |
Simon
2002 4/4
1936 Austin 12 light 4 Ascot saloon
2023 AMG Mercedes C300e estate
2021 Audi A1 sport
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Joined: May 2008
Posts: 1,103 Likes: 2
Has a lot to Say!
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Has a lot to Say!
Joined: May 2008
Posts: 1,103 Likes: 2 |
Perhaps check the large engine loom multi-connectors as mine started to come loose and contact was poor when hot. (One situated near the end of the cam shaft covers near to the battery was worse).
Keith
Car 54 - 'Le Mans 62' 4/4 Supersport
OxMog Member (and associated with CranMog and SwanMog)
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Joined: Jan 2016
Posts: 625
Talk Morgan Regular
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Talk Morgan Regular
Joined: Jan 2016
Posts: 625 |
O 2 sensor issue. See this Some great tips to look for in this, most of these decode sites just tell you the meaning without suggestions. I have book marked this site, thank you Richard 👍🏻
Cheers John
2011 4/4 - "Elrond"
2007 Elfin C3 Clubman - “Gimli”
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Joined: Apr 2014
Posts: 3,547 Likes: 4
Talk Morgan Addict
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Talk Morgan Addict
Joined: Apr 2014
Posts: 3,547 Likes: 4 |
Were the lambda sensors genuine Ford ones? after market Ford ones don't seem to work very reliably, had issues with my wife's StreetKa - fitting genuine Ford ones after trying after market ones sorted it.
Mark - No Longer driving Archie the Old English Sheep Mog........... 2010 Roadster 3.0 V6 (S3) 
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Joined: Mar 2010
Posts: 220 Likes: 1
L - Learner Plates On
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OP
L - Learner Plates On
Joined: Mar 2010
Posts: 220 Likes: 1 |
Thanks for all the good advice.
Richard and Mark you were right.
After replacing the O2 sensors with proper ones from NTK the problem disappeared.
Its been running good since tuesday
4/4 2 seater 2001 model
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Joined: Mar 2017
Posts: 1,611 Likes: 1
Talk Morgan Enthusiast
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Talk Morgan Enthusiast
Joined: Mar 2017
Posts: 1,611 Likes: 1 |
Perhaps check the large engine loom multi-connectors as mine started to come loose and contact was poor when hot. (One situated near the end of the cam shaft covers near to the battery was worse). Wonder if that’s my problem
SFG
2012 4/4 Sport
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