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#518003 - 17/06/18 07:48 AM Intermittent cutting out
Max5 Offline

Talk Morgan Regular

Registered: 02/05/11
Posts: 863
Loc: Ayrshire
My 1600 X-flow is just back from an engine rebuild by Agra engineering, a respected competition engine builder and it is now producing well north of 100bhp on a rejetted standard progressive Weber. The car ran very well for the first couple of hundred miles but it has now developed a fault which causes the engine to die while driving. The engine will restart after a couple of turns of the key but the process will repeat at random. The carb. has been cleaned out and an in-line filter installed.The engine is running Lumenition electronic ignition with the infra red beam and "chopper" and the standard distributor has been modified for mechanical advance only, with a maximum advance of 34 degrees.
I am leaning towards coil breakdown or a fault in the ignition box but I wondered if anyone else has experienced this and can offer any pointers?
Don.

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#518004 - 17/06/18 08:06 AM Re: Intermittent cutting out [Re: Max5]
DaveW Offline
Roadster Guru
Member of the Inner Circle

Registered: 11/12/08
Posts: 16568
Loc: South Yorkshire
I had a Lumenition module go intermittent on me on an MGB and it drove me mad.
Experts tell you that they either work or they don't but mine was intermittent.
I went through everything, carbs fuel feed, coil etc and as a last resort I went back to points......
Hey presto.
And that module wasn't very old!
_________________________
DaveW
2005 Corsa Red Roadster S1
2016 Saffron Yellow (Narrow) Plus 4

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#518015 - 17/06/18 08:55 AM Re: Intermittent cutting out [Re: Max5]
Calypso Red Offline
Just Getting Started

Registered: 20/08/17
Posts: 25
Loc: Staffordshire UK
Does it have a mechanical fuel pump by any chance? I had the same symptom which was due to intermittant sticking of the pump valves. A new pump sorted it.
_________________________
Calypso Red
1994 +8 BMW Calypso Red.
2002 4/4 4 seater BMW Calypso Red.

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#518017 - 17/06/18 09:04 AM Re: Intermittent cutting out [Re: Calypso Red]
Max5 Offline

Talk Morgan Regular

Registered: 02/05/11
Posts: 863
Loc: Ayrshire
The in-line filter is transparent and the pump can be seen to work quite clearly,thanks.

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#518018 - 17/06/18 09:07 AM Re: Intermittent cutting out [Re: DaveW]
Max5 Offline

Talk Morgan Regular

Registered: 02/05/11
Posts: 863
Loc: Ayrshire
Dave - General consensus in the paddock at the hillclimb I was supposed to be taking part in yesterday and today agrees that the Lumenition may well be the source of the problem.
Don

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#518019 - 17/06/18 09:28 AM Re: Intermittent cutting out [Re: Max5]
Mogdriver Offline
New to Talk Morgan

Registered: 19/11/13
Posts: 22
Loc: Tauranga. New Zealand
Hi Don
Like Dave I had a fault develop in a Lumenition module that I had correctly installed in a Commodore to replace the points. Luckily it happened close to home but I then had to face the questioning from the agents from whom I had purchased it from down in Wellington ( NZ ). I was accused of incorrect electrical connections but it was not the first Lumenition I had installed and thank goodness they replaced the module. But somewhat frustrating because it was intermittent but once module replaced no further problem.
Doug
From deep deep down under.

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#518025 - 17/06/18 10:11 AM Re: Intermittent cutting out [Re: Max5]
DaveW Offline
Roadster Guru
Member of the Inner Circle

Registered: 11/12/08
Posts: 16568
Loc: South Yorkshire
My first Lumenition worked for years without a problem but the faulty unit was not long out of warranty.
_________________________
DaveW
2005 Corsa Red Roadster S1
2016 Saffron Yellow (Narrow) Plus 4

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#518042 - 17/06/18 11:54 AM Re: Intermittent cutting out [Re: Max5]
Stephen888 Offline
L - Learner Plates On

Registered: 22/03/11
Posts: 166
Loc: Cambridge UK
My ignition started to cut out and eventually failed. It was the Lumenition which had worked ok for many years.
_________________________
1980 +8 Blue
----------------
Stephen

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#518056 - 17/06/18 01:17 PM Re: Intermittent cutting out [Re: Max5]
Paul F Offline

Talk Morgan Expert

Registered: 20/08/10
Posts: 2029
Loc: Costock, South Nottinghamshire...
Does the carburettor have an electrically operated “anti-run-on” valve?

If so, worth checking the connections as it will have been one of the things that has been disturbed in the re-fit process.

Also, are there any lengths of rubber pipe in the fuel line? These can fail internally in such a way as to give these symptoms - a friend had this on a Midget and spent weeks looking for an electrical issue when the fault was fixed by changing a short length of pipe.
_________________________
Paul
Costock, UK
2014 4/4 Rolls Royce Garnet Red
Disco 4
Teddy - 17h1 Irish Draught cross

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#518058 - 17/06/18 01:40 PM Re: Intermittent cutting out [Re: Max5]
DaveW Offline
Roadster Guru
Member of the Inner Circle

Registered: 11/12/08
Posts: 16568
Loc: South Yorkshire
Oh and another thing. If you have blade fuses, they can develop a hairline crack, which may open up as the fuse heats. With the circuit broken they cool and re-connect, so check any blade fuse feeding the ignition system very closely.
_________________________
DaveW
2005 Corsa Red Roadster S1
2016 Saffron Yellow (Narrow) Plus 4

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