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Re: Won't idle..... [Re: TBM] #553867
14/01/19 10:09 PM
14/01/19 10:09 PM
Joined: Dec 2017
Posts: 218
Colorado, USA
B
britmog Offline
L - Learner Plates On
britmog  Offline
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B

Joined: Dec 2017
Posts: 218
Colorado, USA
So the idle issues have occurred since you "set up" the idle mixture screw and throttle screw a few weeks ago?


Bruce Marshall
1964 4/4 Series V Comp (Megan)
1994 +8 (Maurice)
2013 M3W (Olga)
Re: Won't idle..... [Re: britmog] #553870
14/01/19 10:21 PM
14/01/19 10:21 PM
Joined: Nov 2018
Posts: 529
Northants, UK
TBM Offline OP
Talk Morgan Regular
TBM  Offline OP
Talk Morgan Regular

Joined: Nov 2018
Posts: 529
Northants, UK
Originally Posted By britmog
So the idle issues have occurred since you "set up" the idle mixture screw and throttle screw a few weeks ago?


No, they've been occurring since I bought her in Novemeber.

Last time it happened (before this most recent event) I wound the tickover right up to try and stop her from stalling. When she cleared herself the idle was really high, so I reduced the idle and set the mixture. Had two clear weeks, until the latest fill up....


1972 4/4 4 seater
Too many ratty motorbikes
Re: Won't idle..... [Re: TBM] #553872
14/01/19 10:39 PM
14/01/19 10:39 PM
Joined: Apr 2014
Posts: 4,273
Llanelli
Ray Offline
Part of the Furniture
Ray  Offline
Part of the Furniture

Joined: Apr 2014
Posts: 4,273
Llanelli
Have you tried the Italian tune up.... Some times it does work.


.+8 Now gone for a 1800 4/4. Duratec in bright yellow.
Re: Won't idle..... [Re: TBM] #553876
14/01/19 11:08 PM
14/01/19 11:08 PM
Joined: Sep 2011
Posts: 11,597
Mandello del Lario, Lake Como,...
Gambalunga Offline
Member of the Inner Circle
Gambalunga  Offline
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Joined: Sep 2011
Posts: 11,597
Mandello del Lario, Lake Como,...
Originally Posted By TBM
The card has only done 600 miles from new, so shouldn't be worn. If the other fixes don't work, I'll start digging deeper.

I assume that is automatic predictive text error and you actually meant "The car has only done 600 miles from new". If so it means it has been sitting unused in a garage for an awful long time. In a case like this you can get corrosion in the fuel tank due to condensed water. I have never done it but I believe that the fuel tank can be removed from under the car. It might be an idea to keep in mind the possibility of removing it and giving it a good flush and maybe a treatment or alternatively put a new tank in the budget.

The fact that it is cutting out at idle tends to eliminate the possibility of an actual fuel line blockage or it would be running lean or cutting out under load. If you have an exhaust leak that is heating the fuel line or the fuel line has bee routed too close to the exhaust it could be causing vaporisation in the fuel line.

If it is a fuel problem it is either too rich at idle (black exhaust smoke or plugs fouling) or too lean. Fuel level too high or too low or either the needle jet, the float, or the idle jet giving problems.

Have you fitted new plugs, plug caps and leads? The old ones could well be faulty. Losing the spark through a faulty plug lead is not uncommon. If still original they have probably deteriorated over the years.

A new condenser, new plugs, caps and plug leads won't cost a fortune and will pretty much eliminate ignition problems (check for any poor, corroded, or loose wiring connections too.

If that is not the problem you have to chase down the possibility of a fuelling issue.

When you get it all sorted you will have a wonderful low mileage classic.


Peter

[Linked Image]
Re: Won't idle..... [Re: Gambalunga] #553878
14/01/19 11:20 PM
14/01/19 11:20 PM
Joined: Dec 2009
Posts: 20,732
Devonshire
+8Rich Offline
Member of the Inner Circle
+8Rich  Offline
Member of the Inner Circle

Joined: Dec 2009
Posts: 20,732
Devonshire
Originally Posted By Gambalunga
Originally Posted By TBM
The card has only done 600 miles from new, so shouldn't be worn. If the other fixes don't work, I'll start digging deeper.

I assume that is automatic predictive text error and you actually meant "The car has only done 600 miles from new". If so it means it has been sitting unused in a garage for an awful long time. In a case like this you can get corrosion in the fuel tank due to condensed water. I have never done it but I believe that the fuel tank can be removed from under the car. It might be an idea to keep in mind the possibility of removing it and giving it a good flush and maybe a treatment or alternatively put a new tank in the budget.

The fact that it is cutting out at idle tends to eliminate the possibility of an actual fuel line blockage or it would be running lean or cutting out under load. If you have an exhaust leak that is heating the fuel line or the fuel line has bee routed too close to the exhaust it could be causing vaporisation in the fuel line.

If it is a fuel problem it is either too rich at idle (black exhaust smoke or plugs fouling) or too lean. Fuel level too high or too low or either the needle jet, the float, or the idle jet giving problems.

Have you fitted new plugs, plug caps and leads? The old ones could well be faulty. Losing the spark through a faulty plug lead is not uncommon. If still original they have probably deteriorated over the years.

A new condenser, new plugs, caps and plug leads won't cost a fortune and will pretty much eliminate ignition problems (check for any poor, corroded, or loose wiring connections too.

If that is not the problem you have to chase down the possibility of a fuelling issue.

When you get it all sorted you will have a wonderful low mileage classic.


Peter, reading that back I think TBM maybe meant that the carb has only got 600 miles on it from new so has been replaced recently.
I maybe wrong.


Regards Richard

1999 Indigo Blue +8
2009 4/4 Sport Green
1994 Connaught Green +8





Re: Won't idle..... [Re: +8Rich] #553882
15/01/19 12:09 AM
15/01/19 12:09 AM
Joined: Apr 2011
Posts: 7,505
West Paris, France
pandy Offline
Talk Morgan Guru
pandy  Offline
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Joined: Apr 2011
Posts: 7,505
West Paris, France
Won't idle ?

Get it a job with the council hide


Giles. Mogless in Paris.
Re: Won't idle..... [Re: TBM] #553884
15/01/19 02:58 AM
15/01/19 02:58 AM
Joined: Sep 2015
Posts: 126
Massachusetts, USA
M
morgan_75 Offline
L - Learner Plates On
morgan_75  Offline
L - Learner Plates On
M

Joined: Sep 2015
Posts: 126
Massachusetts, USA
A vacuum leak would cause poor idle and make it impossible to tune low speed. A blockage in the idle circuit will also make it impossible to tune. You might not notice either of these at higher engine speeds.


'61 +4 DHC
'70 4/4
'80 4/4 4seater
Re: Won't idle..... [Re: Ray] #553887
15/01/19 07:05 AM
15/01/19 07:05 AM
Joined: Nov 2018
Posts: 529
Northants, UK
TBM Offline OP
Talk Morgan Regular
TBM  Offline OP
Talk Morgan Regular

Joined: Nov 2018
Posts: 529
Northants, UK
Originally Posted By Ray
Have you tried the Italian tune up.... Some times it does work.


Funny you should say that - first time it happened I was in the Cotswolds, it lasted for a couple of days and I was getting VERY frustrated - took a very fast blat up the M5 to Worcester to see my folks, and it cleared..... (I reckon it was as soon as she caught sight of the Malverns!)

Last edited by TBM; 15/01/19 07:06 AM.

1972 4/4 4 seater
Too many ratty motorbikes
Re: Won't idle..... [Re: +8Rich] #553888
15/01/19 07:09 AM
15/01/19 07:09 AM
Joined: Nov 2018
Posts: 529
Northants, UK
TBM Offline OP
Talk Morgan Regular
TBM  Offline OP
Talk Morgan Regular

Joined: Nov 2018
Posts: 529
Northants, UK
Originally Posted By +8Rich
Originally Posted By Gambalunga
Originally Posted By TBM
The card has only done 600 miles from new, so shouldn't be worn. If the other fixes don't work, I'll start digging deeper.

I assume that is automatic predictive text error and you actually meant "The car has only done 600 miles from new". If so it means it has been sitting unused in a garage for an awful long time. In a case like this you can get corrosion in the fuel tank due to condensed water. I have never done it but I believe that the fuel tank can be removed from under the car. It might be an idea to keep in mind the possibility of removing it and giving it a good flush and maybe a treatment or alternatively put a new tank in the budget.

The fact that it is cutting out at idle tends to eliminate the possibility of an actual fuel line blockage or it would be running lean or cutting out under load. If you have an exhaust leak that is heating the fuel line or the fuel line has bee routed too close to the exhaust it could be causing vaporisation in the fuel line.

If it is a fuel problem it is either too rich at idle (black exhaust smoke or plugs fouling) or too lean. Fuel level too high or too low or either the needle jet, the float, or the idle jet giving problems.

Have you fitted new plugs, plug caps and leads? The old ones could well be faulty. Losing the spark through a faulty plug lead is not uncommon. If still original they have probably deteriorated over the years.

A new condenser, new plugs, caps and plug leads won't cost a fortune and will pretty much eliminate ignition problems (check for any poor, corroded, or loose wiring connections too.

If that is not the problem you have to chase down the possibility of a fuelling issue.

When you get it all sorted you will have a wonderful low mileage classic.


Peter, reading that back I think TBM maybe meant that the carb has only got 600 miles on it from new so has been replaced recently.
I maybe wrong.


Correct - it's the carb.

However, although she's done about 82000 in total, she's only done about 600 in the last 6 years, so I think there will be a lot of crud in the tank getting stirred up.

I've have priced up a replacement tank as a last resort!


1972 4/4 4 seater
Too many ratty motorbikes
Re: Won't idle..... [Re: TBM] #553889
15/01/19 07:14 AM
15/01/19 07:14 AM
Joined: Nov 2018
Posts: 529
Northants, UK
TBM Offline OP
Talk Morgan Regular
TBM  Offline OP
Talk Morgan Regular

Joined: Nov 2018
Posts: 529
Northants, UK
First of all, a big thank you for all the help and advice - very much appreciated.

Frustratingly, she started perfectly last night after I'd got the headlights working, and she did the 25 miles commute to work without issue......


1972 4/4 4 seater
Too many ratty motorbikes
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