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MG MGB Technical - electrical 'miss'

1979 was running like a top when i completely lost power. won't start. Ordered and installed new cap, rotor, wires and plugs. Started right up but now I have a very prominent miss at low "r's" and it is very minor at high "r's". I have an after market electronic ignition on this with a petronix coil. Ideas?
Peter Murray

Is this a pertronix I or II. I have experienced similar problems with both set-ups despite using the specified coils for each. I finally had to abort using the Pertronix II and go with the Pertronix I and their 3 ohm Flamethrower coil. Also you need to bypass the balast resistor and bring 12V to the positive side of the coil. When I tried to leave the balast resistor wire in the set-up with a 1.5 ohm Flamethrower coil and the Pertronix I I still had the miss, especially after the car warmed up. Hope this helps. BTW mine is also a 1979.
Frank Mooring

That is a good question and I will have to investigate it..however I was running smoothly before I dropped what ever dropped, (cap, rotor etc.) I am wondering if I should back off the things I replaced to see if one of the new products is causing the miss. I.E., go back to the old wires, or re-install the old plugs but for some reason in the back of my mind i don't think plugs are the problem.
Peter Murray

This thread was discussed on 25/07/2007

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