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The cam sensor and the crank sensor replace the need for a distributor on all modern cars which use a computer to send the fire signal to the correct spark plug. Both signals are necessary to do this. A failure of either one will cause the engine to die. Over time, both of these failed on my 92 PA. This usually happened after the engine got hot. Allowing it to cool down it would start again and run for a short time period. I had it repaired at a Buick dealer and it cost about $300. I don't know how hard it would be to do it yourself.

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Q: What does a Cam sensor do and how much does it cost to replace?
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