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#553791 - 14/01/19 03:32 PM Re: Won't idle..... [Re: TBM]
britmog Offline
L - Learner Plates On

Registered: 13/12/17
Posts: 173
Loc: Colorado, USA
For the sake of being boorish, carry out each corrective measure separately or you will never know what the actual problem was.
_________________________
Bruce Marshall
1964 4/4 Series V Comp (Megan)
1994 +8 (Maurice)
2013 M3W (Olga)

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#553816 - 14/01/19 05:37 PM Re: Won't idle..... [Re: britmog]
TBM Offline
Learner Plates Off!

Registered: 06/11/18
Posts: 430
Loc: Northants, UK
Originally Posted By britmog
For the sake of being boorish, carry out each corrective measure separately or you will never know what the actual problem was.


I think I'll start with cleaning the fuel systems - the problam is that the issue is fairly sporadic so might take weeks
On the 25 mile journey home tonight the problem continued almost immediately I put the choke in and persisted all the way home. I found that if I pulled the choke out about 2cm prior to each potential stop, she would keep running (albeit a slightly quicker tickover).

Just jerry rigged the headlights to bypass the broken column switch which took about an hour (I'm working on the drive in the dark!), started her up to turn her round on the drive and she's ticking over normally again!!!

The fact that she'll run on choke still makes me lean more towards a fuelling issue, rather that electrical but I'm baffled by her ability to 'self fix'. Usually a blocked jet in a bike means a carb strip and fettle.....
_________________________
1972 4/4 4 seater
Too many ratty motorbikes

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#553825 - 14/01/19 06:20 PM Re: Won't idle..... [Re: TBM]
Paul F Offline

Talk Morgan Expert

Registered: 20/08/10
Posts: 2285
Loc: Costock, South Nottinghamshire...
Sounds like a small bit of crud flapping about in the idle jet - assuming that your choke trick is engaging the fast idle which (IIRC) is main jet.

If the car has had little use prior to your giving it a good home, then there could well be issues in the fuelling system. There may even be deterioration of some of the pipes. A friend had an issue with an MG Midget that kept losing power - transpired the fuel hose near the tank had broken down inside but still looked in good order from the outside.

Good luck.
_________________________
Paul
Costock, UK
2014 4/4 Rolls Royce Garnet Red
Disco 4
Teddy - 17h1 Irish Draught cross

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#553826 - 14/01/19 06:28 PM Re: Won't idle..... [Re: TBM]
TBM Offline
Learner Plates Off!

Registered: 06/11/18
Posts: 430
Loc: Northants, UK
Yes, I'm pretty sure that's the main problem - tank crud. Thankfully the main run of fuel pipe is copper, and everything under the engine bay is new, but I'll have a look at the last bit between tank and copper.

I've read about a 'fix' where a bit of stainless fly screen mesh is fitted over the tank pick up pipe - however the bits must be pretty tiny if they're getting through the filter and the fuel pump gauze so I doubt they'd be stopped by the mesh.

I might see if I can get a better quality filter than the plastic ones being fitted.
_________________________
1972 4/4 4 seater
Too many ratty motorbikes

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#553842 - 14/01/19 08:19 PM Re: Won't idle..... [Re: TBM]
britmog Offline
L - Learner Plates On

Registered: 13/12/17
Posts: 173
Loc: Colorado, USA
When she idles without the use of choke, etc. the revs are at the normal level aren't they? Just making sure that the accelerator stop screw has not shifted or is loose. Also just check that the accelerator cable is moving freely and everything returns to where it should on de-acceleration.
_________________________
Bruce Marshall
1964 4/4 Series V Comp (Megan)
1994 +8 (Maurice)
2013 M3W (Olga)

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#553846 - 14/01/19 08:30 PM Re: Won't idle..... [Re: TBM]
CooperMan Online   content

Talk Morgan Regular

Registered: 19/11/15
Posts: 834
Loc: Yorkshire
Originally Posted By TBM
Originally Posted By CooperMan
TBM, looking at the age of your Mog, I would suggest you replace your Condenser as they are known to fail erratically when hot (assuming you're still on points & condenser ignition)


Good call.

I'll get that sorted as well. Ultimately will change to an electronic but that'll in a couple of 'pay days'!


TBM, don't pay silly money for some of the electronic conversions on the market

I use one by Accuspark that gets rid of the points & condenser, fits inside the existing Dizzy cap and uses your existing coil, only about £30, half an hour to fit and you can still set the timing up with a basic timing light
_________________________
Jon M

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#553848 - 14/01/19 08:37 PM Re: Won't idle..... [Re: britmog]
TBM Offline
Learner Plates Off!

Registered: 06/11/18
Posts: 430
Loc: Northants, UK
Originally Posted By britmog
When she idles without the use of choke, etc. the revs are at the normal level aren't they? Just making sure that the accelerator stop screw has not shifted or is loose. Also just check that the accelerator cable is moving freely and everything returns to where it should on de-acceleration.


When idling on the choke, she is idling faster than usual. I did originally consider that the idle screw was slowly unscrewing but I'm pretty sure it's not - I set it up nicely (and the idle mixture screw) a couple of weeks ago when she was running nicely. I've just gone out and checked - it looks like it's still in the same place, but have wound it on about 1/8 of a turn so the screw is perfectly vertical - will be easier to check if it's moved.
_________________________
1972 4/4 4 seater
Too many ratty motorbikes

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#553850 - 14/01/19 08:40 PM Re: Won't idle..... [Re: CooperMan]
TBM Offline
Learner Plates Off!

Registered: 06/11/18
Posts: 430
Loc: Northants, UK
Originally Posted By CooperMan
TBM, don't pay silly money for some of the electronic conversions on the market

I use one by Accuspark that gets rid of the points & condenser, fits inside the existing Dizzy cap and uses your existing coil, only about £30, half an hour to fit and you can still set the timing up with a basic timing light


Yep - I was originally looking at Aldon stuff but then remembered simonbbc who I used on my Land Rovers about 10 years ago - have got a new Powerspark unit, non ballast coil and rotor for under £60! Can easily sneak that past the Mrs.... smile smile
_________________________
1972 4/4 4 seater
Too many ratty motorbikes

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#553861 - 14/01/19 09:34 PM Re: Won't idle..... [Re: TBM]
tmg513 Offline
Talk Morgan Enthusiast

Registered: 27/08/08
Posts: 1950
Loc: Powick
It could be a worn needle valve allowing the carb to flood slightly. Have a look at its tip and make sure it's perfectly conical.
_________________________
1972 4/4 2 Seater

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#553864 - 14/01/19 09:41 PM Re: Won't idle..... [Re: tmg513]
TBM Offline
Learner Plates Off!

Registered: 06/11/18
Posts: 430
Loc: Northants, UK
Originally Posted By tmg513
It could be a worn needle valve allowing the carb to flood slightly. Have a look at its tip and make sure it's perfectly conical.


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.
_________________________
1972 4/4 4 seater
Too many ratty motorbikes

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