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Jun 14th, 2026
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Joined: Oct 2019
Posts: 5,586 Likes: 603
Charter Member
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Joined: Oct 2019
Posts: 5,586 Likes: 603 |
Real long shot, but do you have another coil hanging about ?.... I have heard of a weak coil causing plugs to spark in the open air but not under cylinder conditions ..... exceeding rare but then so is an engine with everything working defying a decent mechanic for three days.
K
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Joined: Nov 2018
Posts: 6,667 Likes: 433
Talk Morgan Sage
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Talk Morgan Sage
Joined: Nov 2018
Posts: 6,667 Likes: 433 |
Real long shot, but do you have another coil hanging about ?.... I have heard of a weak coil causing plugs to spark in the open air but not under cylinder conditions ..... exceeding rare but then so is an engine with everything working defying a decent mechanic for three days.
K Mark's already tried a different coil and ballast. Very frustrating! Just to update, it does have a ballast resistor but I have even tried another ballast resistor and coil - nothing changes
"Y mae dafad ddu ym mhob praidd"
1972 4/4, 1981 MGBGT, 1984 FLHT1340, 1980 XLH1000, 1990 ZX10
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Joined: Oct 2019
Posts: 5,586 Likes: 603
Charter Member
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Charter Member
Joined: Oct 2019
Posts: 5,586 Likes: 603 |
Yep, correct TBM ..... missed that bit ..... Mark ...Can we confirm that the rockers are going up and down and you can hear the compression whoosh with the plugs out?
K
Last edited by Image; 22/04/22 09:43 PM.
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Joined: May 2019
Posts: 52 Likes: 2
Just Getting Started
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OP
Just Getting Started
Joined: May 2019
Posts: 52 Likes: 2 |
Tried new coil and ballast resistor, no different. did a compression test, all cylinders good.
I will try a live feed to the ballast resistor in the morning, but I have checked with a voltmeter before and that was ok
Mark
1979 4/4 crossflow engine by Colin Musgrove, twin 40’s
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Joined: Nov 2018
Posts: 1,065 Likes: 23
Has a lot to Say!
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Has a lot to Say!
Joined: Nov 2018
Posts: 1,065 Likes: 23 |
After the rebuild of a MINI engine I fitted the distribur (I hope it‘s right) in a wrong way, or better the driver for it. So the spark fires,
but it fires in lower deadend, not the topend point. It took a long time to find the mistake.
Another time we changed the leads. Only changing one hole to the right. The same result- firing in the lower deadend.
Sorry about my bad English, but I hope someone understands and can translate it in the right way.
Greets René
2018 plus4 (sports green)
with a homemade really shiny red tinted dash…
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Joined: Nov 2018
Posts: 6,667 Likes: 433
Talk Morgan Sage
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Talk Morgan Sage
Joined: Nov 2018
Posts: 6,667 Likes: 433 |
And the Xflow has an unusual firing order - 1243 (anticlockwise)
"Y mae dafad ddu ym mhob praidd"
1972 4/4, 1981 MGBGT, 1984 FLHT1340, 1980 XLH1000, 1990 ZX10
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Joined: Nov 2018
Posts: 6,667 Likes: 433
Talk Morgan Sage
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Talk Morgan Sage
Joined: Nov 2018
Posts: 6,667 Likes: 433 |
How old is the fuel? Fuel goes off so quickly these days - if it is old wonder if it may be soaking the plugs and preventing the easystart from catching?
(throwing everything at the wall in the hope that something sticks!)
"Y mae dafad ddu ym mhob praidd"
1972 4/4, 1981 MGBGT, 1984 FLHT1340, 1980 XLH1000, 1990 ZX10
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Joined: Jul 2019
Posts: 5,438 Likes: 467
Charter Member
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Charter Member
Joined: Jul 2019
Posts: 5,438 Likes: 467 |
Perhaps suspect fuel...?
OK so it does not even run on easy start.... perhaps the plugs were soaked before the last attempt with easy start which may explain that phenomena.. If you dry the plugs then squirt the easy start, that might cancel out that line of thought..? Keep with the programme TBM...  I am looking forward to the resolution of this one.. 
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Joined: Oct 2019
Posts: 5,586 Likes: 603
Charter Member
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Charter Member
Joined: Oct 2019
Posts: 5,586 Likes: 603 |
Mark .... if it has compression and spark then, beyond something truly bizarre like the packing in your silencer collapsing and blocking the exhaust (even then you'd expect some flutter out of the easystart) .... my money would still be on timing as it should do something on easystart under those circumstances.... totally frustrating for you .... as above, I'll be interested to see what the problem is when you triumph over the cast-iron demon.
K
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Joined: May 2019
Posts: 52 Likes: 2
Just Getting Started
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OP
Just Getting Started
Joined: May 2019
Posts: 52 Likes: 2 |
Things I have tried this morning
* Wired the coil direct to the battery
* fitted plug leads 180 degrees out
* moved leads on one way anti clockwise
All again nothing, not even fired since Monday
As far as fuel is concerned,I have put new fuel in but the fact that will not even fire on Easystart suggests that fuel is not a factor. There is a spark at the end of the plug leads, the only thing I can’t check is the spark at the plug under load, but plugs are good and that I have tried a known spare coil and ballast resistor, suggests this is not the problem, again still at a loss as to why it won’t even fire.
Mark
1979 4/4 crossflow engine by Colin Musgrove, twin 40’s
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