I had a similar situation on my '75 B roadster. I finally nailed it down
to one of two things. I have the Mallory Dual point dizzy. On that
unit, the condenser is grounded to the body of the dizzy (like all of the
rest)
But, on mine, there was just enough corrosion between the condensor and body
of the dizzy to negatively impact the connection. After I cleaned it all up,
the car would start but not run for very long. When I reinstalled the
condensor, I had almost shorted it against the connection between the points
and coil. the car would start, the vibration of the engine was just enough to
cause the condensor to contact the post where the coil connects to the points.
The short would kill the engine. I found it by mistake when I decided to look
over every thing with my trusty DVM in hand. Now all is fine...
Good luck.
Joe
'75 'B Roadster
>===== Original Message From Mike Razor <mrazor@kih.net> =====
>Coil or condenser! Got to be the coil or condenser. But make sure your fuses
are making very good contact. The TD would just
>up and die and after about 15 or less minutes of running. Checked it all
out, could find nothing wrong. Finally checked out
>the fuse box and what was happening: As the car got hot the fuse clip would
pull back, ever so slightly and break contact.
>Result, dead car. Car would cool down (usually while on the tow dolly or
truck) and would start. I pulled the fuses out
>cleaned, filed and crimped and the problem was fixed.
>But I bet the coil or condenser are the real culprits.
>THANKS!
>Mike R
>
>
>mowog77 bootknocker wrote:
>
>> Scott,
>>
>> It sounds like a hot coil.
>> Are you running a ballast resistor?
>> Double check for one, even if you don't see it at first, they are sometimes
hidden in the loom!
>>
>> I had the same exact problem in my 77. It would just die instantly and then
start right back up in ten to fifteen minutes!
>> I was ballasted.
>> I bypassed the ballast and it happens no more!
>>
>> Erik.
>> --
>>
>> On Wed, 15 Sep 1999 14:34:02 Scott McKorkle wrote:
>> >Strange thing this afternoon. I was out for a drive and had done about a
>> >half hour at average speeds (30-40 mph). I was slowing for a stop light
>> >and the engine just quit. Not a gradual loss of power, like fuel
>> >starvation, but just a sudden cessation of power, like someone turned off
>> >the key. I coasted to a stop and switched on my hazard flashers (meaning
>> >that electrical was still working), turned off the key and tried starting
>> >her up. She started immediately and ran perfectly well all way home.
>> >
>> >A cursory check at home showed no loose or frayed wires, but I'm sure I
>> >could have missed something. Does this sound like a failing coil or is
>> >there something else I should check. The car is a 1978 MGB with points, a
>> >25D4 distributor and standard coil.
>> >
>> >Thanks!
>> >Scott McKorkle
>> >1978 MGB
>> >
>>
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