Click here to return to the home page.
Image of a road.
Who's Online
17 registered (Wirewheel, CooperMan, Richard Wood, stevemag, A11OGE, griffo, Phil Bleazey, mph, MOG 615, brownbaker, JCD, jbk, kennethjoh, 60Yards, Pmh44, smudger1, petemog), 50 Guests and 10 Spiders online.
Key: Admin, Global Mod, Mod
Latest Photos
Turbo Plus 4 - final report
Sunny Shropshire!
As Ordered
Spring in Norway
Vehicle Lifts
Newest Topics
Garage Lift double stack Morgan cars
by BuyBritish
24/04/19 06:47 AM
Fairbourne Screen Update
by Michael H
23/04/19 09:22 PM
PSA - 1.6 Sigma - copper adapter is a weak link
by PerryP
23/04/19 06:32 PM
Turbo Plus 4 Plus -- final report
by griffo
23/04/19 04:44 PM
Dimension needed -Plus 8
by Culminator
23/04/19 04:29 PM
Tesla (your car will go moonlighting!)
by Alistair
23/04/19 02:02 PM
good new toy for smartphone photography
by Alistair
23/04/19 01:21 PM
Newest Members
Andy Hatch, Toyracer59, Roxy Plus4, RobCol, Rsglush
6471 Registered Users
Shout Box

Forum Stats
6,471 Registered Members
33 Forums
34,857 Topics
562,570 Posts

Most users ever online: 341 @ 11/02/18 10:30 PM
Today's Birthdays
ianc
Page 8 of 9 < 1 2 3 4 5 6 7 8 9 >
Topic Options
#554079 - 16/01/19 10:15 AM Re: Won't idle..... [Re: Graham, G4FUJ]
TBM Offline
Learner Plates Off!

Registered: 06/11/18
Posts: 430
Loc: Northants, UK
Originally Posted By Graham, G4FUJ
Just another thought - you possibly have a recirc line (excess fuel returned to fuel tank). May be worth a check.


No - thankfully just a single line.

The fact that she's playing up hot and cold, start of a journey and end of a journey, full tank and 3/4 tank and then fixing herself, points me towards a 'mechanical' issue rather than an electrical issue.

That said, when I have the problem, she the fact that she stills runs perfectly above idle, and accelerates well, and will idle with a little choke makes me think that the fuel pump, fuel line and carb is OK.

I'm going back to my original thought (prior to the cap breather) that due to lack of use, the tank is full of crap and teeny bits are making through the filter and fuel pump gauze and gumming up the idle jet. I might get a spare to carry round so I can try a quick roadside swap next time it happens.

Hopefully, with time and a few filters, everything will get flushed through!
_________________________
1972 4/4 4 seater
Too many ratty motorbikes

Top
#554082 - 16/01/19 10:33 AM Re: Won't idle..... [Re: TBM]
tmg513 Offline
Talk Morgan Enthusiast

Registered: 27/08/08
Posts: 1950
Loc: Powick
Originally Posted By TBM
Originally Posted By Graham, G4FUJ
Just another thought - you possibly have a recirc line (excess fuel returned to fuel tank). May be worth a check.


No - thankfully just a single line.

The fact that she's playing up hot and cold, start of a journey and end of a journey, full tank and 3/4 tank and then fixing herself, points me towards a 'mechanical' issue rather than an electrical issue.

That said, when I have the problem, she the fact that she stills runs perfectly above idle, and accelerates well, and will idle with a little choke makes me think that the fuel pump, fuel line and carb is OK.

I'm going back to my original thought (prior to the cap breather) that due to lack of use, the tank is full of crap and teeny bits are making through the filter and fuel pump gauze and gumming up the idle jet. I might get a spare to carry round so I can try a quick roadside swap next time it happens.

Hopefully, with time and a few filters, everything will get flushed through!

Mine's got a drain plug on the bottom of the tank. Might be worth draining it when you get low to see what comes out.
_________________________
1972 4/4 2 Seater

Top
#554089 - 16/01/19 11:01 AM Re: Won't idle..... [Re: tmg513]
TBM Offline
Learner Plates Off!

Registered: 06/11/18
Posts: 430
Loc: Northants, UK
Originally Posted By tmg513
Mine's got a drain plug on the bottom of the tank. Might be worth draining it when you get low to see what comes out.


Good plan, thank you. Worth sacrificing a few litres. I can give her a good 'sloshing' before hand too.
_________________________
1972 4/4 4 seater
Too many ratty motorbikes

Top
#554128 - 16/01/19 02:38 PM Re: Won't idle..... [Re: TBM]
sospan Offline
Talk Morgan Sage

Registered: 31/05/10
Posts: 6095
Loc: Llanelli
I had a fuel problem on my 1993 4/4. It was the pump. While renewing it I decided to check the whole system. I drained the tank using the drain plug. Filtered the fuel and saw crud in it. So, I flushed the tank. Next I fitted a serviceable glass filter between tank and new pump, put new flexible pipes. New filter under the bonnet. Used Millers additive in the first few tankfulls to hopefully flush clean the solid pipes and injectors. Car went really well after that.
The lesson, I think, is that the car was 20+ years old so the fuel system was due for a bit of refurb. Luckily the tank had the drain plug which meant draining/flushing was easier. As a check I put 1 gallon into an empty tank and looked at the gauge on the dash. I then knew where the safety margin was! Mind you the gauge would fluctuate a lot on cornering. If draining the tank it would be a nice touch.
Just to edit......I flushed by draining, filtering and using the filtered fuel to slosh round thetank. As far as I could see the interior was good and no crud after the 3rd flush.


Edited by sospan (16/01/19 02:41 PM)
_________________________
Red Plus8

Top
#554170 - 16/01/19 08:18 PM Re: Won't idle..... [Re: TBM]
TBM Offline
Learner Plates Off!

Registered: 06/11/18
Posts: 430
Loc: Northants, UK
Anyone know the idle jet size on the Weber twin choke carb?

Thinking about getting a spare for a quick roadside swap if it happens in future? I could just whip the original out and clean it, but knowing me I'll drop it and it'll roll down a drain so if I have a spare at least I can get home!
_________________________
1972 4/4 4 seater
Too many ratty motorbikes

Top
#554172 - 16/01/19 08:36 PM Re: Won't idle..... [Re: TBM]
tmg513 Offline
Talk Morgan Enthusiast

Registered: 27/08/08
Posts: 1950
Loc: Powick
Originally Posted By TBM
Anyone know the idle jet size on the Weber twin choke carb?

Thinking about getting a spare for a quick roadside swap if it happens in future? I could just whip the original out and clean it, but knowing me I'll drop it and it'll roll down a drain so if I have a spare at least I can get home!

Whip the jet out, it'll be engraved on the side. If the engine's been modified at any point it may have been re-jetted.
_________________________
1972 4/4 2 Seater

Top
#554326 - 17/01/19 03:56 PM Re: Won't idle..... [Re: TBM]
jbk Online   content

Talk Morgan Regular

Registered: 10/02/12
Posts: 608
Loc: Essex
Back in the dark ages I had a similar idling problem, turned out be a shard of fibreglass in the idle jet, you could see right through the jet and it was not until I blew through it against the direction of flow that it lightly stuck into my finger. That was a Ginetta with a fibreglass fuel tank, but you might get a similar effect with a grain of sand, give it a blow, worth a try?
_________________________
1993 T16 +4 Lancia Blue.

Top
#554449 - 18/01/19 01:44 AM Re: Won't idle..... [Re: TBM]
morgan_75 Offline
L - Learner Plates On

Registered: 23/09/15
Posts: 123
Loc: Massachusetts, USA
your slow running jets should be 50/45
_________________________
'61 +4 DHC
'70 4/4
'80 4/4 4seater

Top
#554481 - 18/01/19 09:19 AM Re: Won't idle..... [Re: TBM]
Richard Wood Online   NoMood
Talk Morgan Enthusiast

Registered: 03/02/16
Posts: 1631
Loc: East Harling, Norfolk UK
Over the years I've had a couple of cars when first purchased that wouldn't idle properly or for a period of time before stalling.

On a newish Sunbeam Imp Sport with twin Strombergs, I discovered the plastic float in one of them was leaking so full of petrol, in turn causing over rich carb. New float and perfect idle.

On an early 911S rough idle just needed distributor tweak to correct poorly set up ignition timing.
_________________________
Richard

2018 Roadster - Red/Magnolia - "Morton"
1967 Land Rover series 2a SWB
1960 Velocette Venom

Top
#555279 - 22/01/19 07:42 AM Re: Won't idle..... [Re: TBM]
TBM Offline
Learner Plates Off!

Registered: 06/11/18
Posts: 430
Loc: Northants, UK
Been running fine all weekend. Fitted a new fuel filter and popped out one of the idle jets (the one on the opposite side to the engine) and gave it a blow through - it's a 55. Will get a spare for emergency roadside swapouts.

Checked the history that came with the car, and she had a full fuel tank clean by Allon White about 8 years ago, so I imagine it's just a bit of surface rust (hence small particles that are clearing themselves). It all depends if she's been kept with a full tank of fuel or not. It might explain why she plays up with a full tank - slight corrosion on the upper surfaces which gets dislodged when full.
_________________________
1972 4/4 4 seater
Too many ratty motorbikes

Top
Page 8 of 9 < 1 2 3 4 5 6 7 8 9 >

Moderator:  Aeroman, Boshly, Simon