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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: Mar 2016
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OP
New to Talk Morgan
Joined: Mar 2016
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I've generally got two left hands, so any advice will be helpful!
My Sigma engined 2010 4/4 has been running fine until a few month ago. Now, after a specific set of circumstances it badly stutters.
After warming up, any revving above 4000rpm causes the engine to stutter, very similar to fuel starvation I had on an old Sunbeam Stiletto I used to own (that was a rusty fuel tank clogging up the fuel filter - an easy fix!). If I depress the accelerator in any gear there is a severe feeling of starvation, stuttering and shuddering. Keeping below 4000rpm seems to be fine.
This happens if I push the car above 4000rpm while driving (in any gear) or pull over and rev the car while in neutral, then drive off.
If I stop and rest for a few minutes the issue goes away, but then comes back.
For the first 60 minutes of driving I do not notice the problem.
I live in NSW, and have the car serviced at a great, small local garage. But, they are not Morgan experts. They plugged in an OBD2 port but couldn't identify the problem. They changed HT leads and plugs, cleaned the MAF sensor and cleaned the connector on the accelerator pedal. But, all to no avail. Any thoughts on where next to investigate will be very helpful!
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Joined: Nov 2011
Posts: 7,342 Likes: 49
Talk Morgan Guru
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Talk Morgan Guru
Joined: Nov 2011
Posts: 7,342 Likes: 49 |
MartinC
The Sigma is a standard FORD engine so your mechanic won't need specific "Morgan" experience
These units are usually very reliable but you would do well to get it to a recognised FORD dealer or specialist if you have no luck with your local mechanic.
Good Luck
Last edited by OZ 4/4; 17/05/25 10:11 PM.
A Morgan Identified Fastidious Owner...
2011 4/4 Bespoke, 1981 Delorean, Auburn Boat Tail
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Joined: Jul 2007
Posts: 27,833 Likes: 758
Member of the Inner Circle
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Member of the Inner Circle
Joined: Jul 2007
Posts: 27,833 Likes: 758 |
There was a similar post on here for an arp4 where the cat had broken blocking the exhaust gas flow. Or it could be fuel starvation
JohnV6
2022 CX Plus Four
2025 Renault Scenic Alpine etech "Yvette"
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1 member likes this:
Hamwich |
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Joined: Nov 2011
Posts: 7,342 Likes: 49
Talk Morgan Guru
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Talk Morgan Guru
Joined: Nov 2011
Posts: 7,342 Likes: 49 |
There was a similar post on here for an arp4 where the cat had broken blocking the exhaust gas flow. Or it could be fuel starvation Good call....
A Morgan Identified Fastidious Owner...
2011 4/4 Bespoke, 1981 Delorean, Auburn Boat Tail
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Joined: Aug 2017
Posts: 310 Likes: 9
Learner Plates Off!
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Learner Plates Off!
Joined: Aug 2017
Posts: 310 Likes: 9 |
When did you last replace the fuel filter?
1994 +8, BMW Calypso Red.
2002 4/4, 4 seater, BMW Calypso Red.
How do you open the boot?
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Joined: Jul 2007
Posts: 27,833 Likes: 758
Member of the Inner Circle
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Member of the Inner Circle
Joined: Jul 2007
Posts: 27,833 Likes: 758 |
JohnV6
2022 CX Plus Four
2025 Renault Scenic Alpine etech "Yvette"
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Joined: Mar 2017
Posts: 2,274 Likes: 41
Talk Morgan Expert
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Talk Morgan Expert
Joined: Mar 2017
Posts: 2,274 Likes: 41 |
SFG had a similar problem and it turned out to be one of the switches behind the brake pedal.
Craig Jezz
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Joined: Mar 2016
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New to Talk Morgan
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OP
New to Talk Morgan
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Thanks for the great comments - I'll work through it one-by-one and update the post when (eventually) I solve it to help any others with a similar problem.
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1 member likes this:
Luddite |
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Joined: Nov 2011
Posts: 7,342 Likes: 49
Talk Morgan Guru
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Talk Morgan Guru
Joined: Nov 2011
Posts: 7,342 Likes: 49 |
Thanks for the great comments - I'll work through it one-by-one and update the post when (eventually) I solve it to help any others with a similar problem. Good luck with the fix MartinC You should be back on the road in good health very soon.
A Morgan Identified Fastidious Owner...
2011 4/4 Bespoke, 1981 Delorean, Auburn Boat Tail
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Joined: Sep 2009
Posts: 7,435 Likes: 122
Talk Morgan Guru
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Talk Morgan Guru
Joined: Sep 2009
Posts: 7,435 Likes: 122 |
SFG had a similar problem and it turned out to be one of the switches behind the brake pedal. It „could“ have to do with the second switch under the brake pedal at least how the faulty behavior is described but of course many different reasons could be the cause. Only this fault will not be seen in OBD2. https://www.talkmorgan.com/ubbthreads.php/topics/630982/re-diagnosis-please#Post630982
'14 4/4 graphite grey
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