Sprint cut out whilst driving

[tangocharlie1]

After some advice please, yesterday my sprint cut whilst driving around 30mph, luckily i managed to pull into a side street, but it would not restart, it turned over but would not fire. left the car for 30mins and it restarted straight away got it home and took the dizzy cap off, it looked manky along with the rotor arm so cleaned up the terminals, (i am going to fit a new cap, rotor arm and leads as a matter of course), but what else should i be checking ? the car is running Lumenition Magnatronic Ignition and Magnatronic Sports Coil MS3 and has run faultlessly with this set up for 10 + years standard ballast resistor fitted, standard fuel pump. The car was running fine before said incident and fine after i restarted it. It has never done this before.

Could a failing coil/leccy ignition module cause this ? I would of thought that the Leccy ignition would either work or not work with no inbetween ?
Would a dirty cap and rotor arm cause the car just to cut out completely whilst driving ?

Any ideas please ?

[tony g]

I doubt cap and rotor would cause this then re start later. Could be a fuel issue. I went through weeks of chasing a starvation problem. I could go 2 weeks without problem then it would die. Whip the front carb bowl top off and empty. Id syringe the carbs full and off id go, sometimes flat out out of anger and it wouldnt cut out again. In the end I junked the mechanical pump (which was new repro), replaced all the fuel pipes underneath, and fitted an in tank electric pump. Not a problem since (touches wooden table )

Tony

[Bumpa]

If the car just cut out it must be ignition. Fuel starvation will cause loss of power, but the car will keep going for a minute or so with increasingly poor throttle response, until there is no petrol left in the float chambers.

[tangocharlie1]

Yes i believe it is ignition related as there was no signs of fuel starvation, no spluttering, hesistation or anything on the contrary it was running lovely to that point.

[AlanH]

Sounds like something is overheating.

Possibly coil or magnetronic?

[new to this]

sounds like electrical problems,on the electroinc ignition theres a plug and socket,check the pins they some times burn

Dave

[Magenta Auto Sprint]

could be the coil breaking down when hot. not sure about the circuit board on the luminition, I don't know how they are made, I.E potted components on a board or just free standing.

a neighbour of mine had a V12 jag which would cut out and after a while would come back to life, it was broken track on the electronic ignition module which was mounted on top of the engine, expansion and contraction caused the problem.

[GTS290N]

If it happened once and you cannot recreate the fault, eg by running the engine until very hot, then it could be anything, including a loose fuse or bad connection. I wouldn't go replacing parts until you can recreate the fault. You may have already cured it!

[tangocharlie1]

Ok bit of an update i had a quick look last night removed cap, rotor arm and electric ignition module and i discovered the earth strap was in a bad state and broken at one end, if i remember correctly from the installation many moons ago the lead from the removed condenser is re- used as an earth strap. Am I correct in assuming that the broken earth strap would enable the coil to get hot and therefore explain the cutting out of the car on the move and than subsequently when the coil cooled down i was able to restart the car ?
I have not effected a repair yet but i am hoping i have found the cause.

[Jon Tilson]

Ballast bypass feed is likely to be your hot restart problem...

When it all cools down the feed comes back. Keep a flying lead from battery plus or fuse box to coil plus and see if that
gets you going.

With that setup you dont need a ballasted ignition. Just do away with it and run a 12V coil.

Jonners