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if its a points and condenser system that could cause the coil to melt down by a faulty condensor otherwise the coil was either old or a bad vibration caused it to short out and melt down they sometimes fail slowly other times they just go and that's it i never look for a why i just buy another one not a bad idea to keep one at home as a spare or on long road trips

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11y ago
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11y ago

There can be several answers to this problem from low or no fuel pressure, bad ignition switch in the steering column, bad objectors that are clogged, fouled plugs or no spark from coil packs. Give more details on the question or go see a certified mechanic.

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15y ago

Normally heat or vibration.

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Q: What causes an ignition coil to fail?
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