my first thought was the rotor. There are numerous reports of the rivet being
loose/bad.
You don't mention if it's points, original electronic ignition or replacement
(the recall) electronic ignition, or pertronix or anything else.
But still, I'm guessing rotor.
On Jan 25, 2012, at 7:39 PM, DMatt21502@aol.com wrote:
> Yesterday I tried to start my 1977 MGB for the first time in about two
> months. It cranked fine but wouldn't start. It was not getting any spark. I
> took my test lamp and hooked it to the ignition side of coil. With key on
it
> lit up. When I connected the light to both sides of coil and cranked it
> showed nothing. I assumed a bad coil. I then took the distributor cap off
and
> inspected it. Looked ok. Took the rotor out and it looked ok but just for
> good measure I cleaned the connector. Not seeing any evidence of moisture
or
> other problems I reassembled everything and tried to start the car. It
> started without problem and ran fine. This has happened in the past any
time
> the car sits for more than four or five days. Also seems to be more of a
> problem in cold weather. Any ideas
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