383 Vacuum advance leaking
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- Posts: 433
- Joined: Mon Mar 03, 2008 1:59 pm
- Location: Dartford Moor
Re: 383 Vacuum advance leaking
Not sure if you have fixed this problem , but I would say it’s a choke problem rather than advance problem, if you try to give it more fuel and the choke is not working or fully closed it will miss /splutter even stall .How do I know this ? my car hasn’t got a choke fitted and does the same as yours, just needs a little more time to warm up before driving off and all’s fine .
CHEERS BE LUCKY ALAN
Jensen 111/440/1317 /OAR 298P
Jaguar 420G
Jaguar Sovereign v8
Winnebago M/H
Jensen 111/440/1317 /OAR 298P
Jaguar 420G
Jaguar Sovereign v8
Winnebago M/H
Re: 383 Vacuum advance leaking
Thanks for the heads up.money_one_four wrote:Not sure if you have fixed this problem , but I would say it’s a choke problem rather than advance problem, if you try to give it more fuel and the choke is not working or fully closed it will miss /splutter even stall .How do I know this ? my car hasn’t got a choke fitted and does the same as yours, just needs a little more time to warm up before driving off and all’s fine .
Yes nothing is leaking, so it’s starting to narrow down the causes. It only happens when the engine isn’t up to temperature so looks like it could be the choke.
Ta Eddie
Eddie
JOC 10030
Interceptor II 123/3901 CEA 1J
1970 Earls Court Motorshow Car
JOC 10030
Interceptor II 123/3901 CEA 1J
1970 Earls Court Motorshow Car
Re: 383 Vacuum advance leaking
Another one to try is the distributor cap. I had exactly the same problem, the engine needed to properly warm up before the sputtering went away 5 or 6 miles or so with no choke. New cap and never happened again. Theory is a small hairline crack, and moisture condensed in the crack causing the misfiring and needed to get truly warm before the moisture evaporated out again.
Ray
Ray
MkIII Interceptor (140 8488)
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- JOC Scotland Rep
- Posts: 164
- Joined: Mon Apr 29, 2019 11:47 am
- Location: Inverness
Re: 383 Vacuum advance leaking
Hi All.
My 1971 Mk2 Interceptor has the same issues regarding a lack of smooth running when cold. It coughs and splutters if I drive it immediately on fire up after sitting for a few days. Once warmed up it behaves as it should.
On returning from the International at Hull I found I had an increasingly worsening issue with an intermittent back fire, investigation revealed a leak in the fuel feed pipe to the carb, it was cracked. I changed this. At the same time I changed the plugs, HT leads, dizzy cap and rotor arm. I noticed that the off side plug nearest to the bulk head (forget the number) was well carboned up showing intermittent firing, the next one down was not a lot better.
Anyway tomorrow the car goes in to my local tune up specialist (one who does not need a plug in computer to set the car up) to have the points and condenser fitted before tuning the old fashioned way.
Richard
My 1971 Mk2 Interceptor has the same issues regarding a lack of smooth running when cold. It coughs and splutters if I drive it immediately on fire up after sitting for a few days. Once warmed up it behaves as it should.
On returning from the International at Hull I found I had an increasingly worsening issue with an intermittent back fire, investigation revealed a leak in the fuel feed pipe to the carb, it was cracked. I changed this. At the same time I changed the plugs, HT leads, dizzy cap and rotor arm. I noticed that the off side plug nearest to the bulk head (forget the number) was well carboned up showing intermittent firing, the next one down was not a lot better.
Anyway tomorrow the car goes in to my local tune up specialist (one who does not need a plug in computer to set the car up) to have the points and condenser fitted before tuning the old fashioned way.
Richard
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- Posts: 433
- Joined: Mon Mar 03, 2008 1:59 pm
- Location: Dartford Moor
Re: 383 Vacuum advance leaking
Just goes to show how different things can give off the same symptoms, keep us posted Richard will be interesting to hear what they find.
CHEERS BE LUCKY ALAN
Jensen 111/440/1317 /OAR 298P
Jaguar 420G
Jaguar Sovereign v8
Winnebago M/H
Jensen 111/440/1317 /OAR 298P
Jaguar 420G
Jaguar Sovereign v8
Winnebago M/H
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- JOC Scotland Rep
- Posts: 164
- Joined: Mon Apr 29, 2019 11:47 am
- Location: Inverness
Re: 383 Vacuum advance leaking
Hi again.
Just got the car back from the tune up specialist.
Three issues were discovered:-
1 The points were on their last legs so to speak, almost worn away. I asked the garage to replace these as I had no gap set information to do it myself, whereas they have equipment to check dwell angles etc.
2 When fitting the new dizzy cap I had bent the spring steel connector on the rotor arm and it was only just making contact. Apparently this is easy to do due to the access of the distributor and the fact that you do not know you have done it until you remove the cap again. This however is probably not the cause of the original misfire as I do not remember the rotor I took out as being bent. All is now bent back to its correct state.
Some thing to remember if removing the dizzy cap etc.
3 The points had been over greased when last fitted and there was grease everywhere, this can cause connection issues.
The car feels and sounds a lot better now although we suspect a very slight leak in the off side exhaust manifold, may need a new gasket in the future.
I will drive around a bit to see if it is better.
Richard
Just got the car back from the tune up specialist.
Three issues were discovered:-
1 The points were on their last legs so to speak, almost worn away. I asked the garage to replace these as I had no gap set information to do it myself, whereas they have equipment to check dwell angles etc.
2 When fitting the new dizzy cap I had bent the spring steel connector on the rotor arm and it was only just making contact. Apparently this is easy to do due to the access of the distributor and the fact that you do not know you have done it until you remove the cap again. This however is probably not the cause of the original misfire as I do not remember the rotor I took out as being bent. All is now bent back to its correct state.
Some thing to remember if removing the dizzy cap etc.
3 The points had been over greased when last fitted and there was grease everywhere, this can cause connection issues.
The car feels and sounds a lot better now although we suspect a very slight leak in the off side exhaust manifold, may need a new gasket in the future.
I will drive around a bit to see if it is better.
Richard
Re: 383 Vacuum advance leaking
I am thinking I have finally solved the problem with my spit back in the carb when cold.slotcarone wrote:I would fix the advance unit if it is not working. Could possibly be the cause of your problem. Could also be a choke/carb adjustment issue.
The advance unit seems be working & the choke seems to be working.
Watching youtube carb tutorials I firstly moved the pump drive link one hole closer to the carb body. This seemed to make quite a big difference. With this there was no spit back, but I still had a mid range hesitation.
For mid range hesitation I had read about changing the metering springs for a stronger one. I am not 100% sure what was in the carb spring wise, but I have swapped them out for the pink metering springs, these are second stiffest pair in the calibration kit.
The combination of the 2 items seems to have totally eliminated any spit back and and mid range hesitation. The car is probably driving the sweetest I have ever known.
But could my meddling have any adverse effects?
Eddie
JOC 10030
Interceptor II 123/3901 CEA 1J
1970 Earls Court Motorshow Car
JOC 10030
Interceptor II 123/3901 CEA 1J
1970 Earls Court Motorshow Car
Re: 383 Vacuum advance leaking
If it's performing at it's best as you have had it Eddie then that is brilliant and use it as is and enjoy, if it was running lean it would "Ping" if it was running rich then that's not particularly great as it can wash the oil from the bores, but having it as it was backfiring etc was not good so it seems like you have concored it Eddie well done, here you go, if you feel it is good Eddie then I would treat it to a rolling road run, they will run it with an air-fuel meter pushed up the Gilbert Pipe (aka exhaust).. this will confirm your fetteling correctness,.. you normally come out of a rolling road tune happier than you went in.. slight minor adjustments make all the difference Ed..It's a nice treat for any old classic and it's driver I think anyway, find one that is good at tweaking EddieMan.. some just want to give a print out of power, but you want one that can tweak old school stuff..have an ask about EddieMan do you run super unleaded in that Old "E" series engine EddieMan?.. it is an E series engine isn't it?.... If you do run it on super Unleaded you should definitely make sure you have that in it when you treat it to the engine tune on the rollers Ed
Manual Int&Rag-Top
"Monkey Man"sig Registrar
"Monkey Man"sig Registrar
Re: 383 Vacuum advance leaking
Agree with Grant 100%
Rocky
Rocky
‘71 TVR Vixen 2500 - (M Series Tribute)
'72 Interceptor III - 133/5597
'73 DeTomaso Pantera
'74 Toyota Land Cruiser FJ-40
'95 Jaguar XJS Convertible
'72 Interceptor III - 133/5597
'73 DeTomaso Pantera
'74 Toyota Land Cruiser FJ-40
'95 Jaguar XJS Convertible
- slotcarone
- Posts: 1666
- Joined: Sun Aug 29, 2010 1:38 pm
Re: 383 Vacuum advance leaking
If the car is running great then all is fine and you did no wrong!
1972 Interceptor III
133-5612
133-5612