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Q: Car doesn't start after replacing key cylinder.

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I replaced the key cylinder. I used the heavy key chain and the car started fine. Then, all of a sudden, it won't start unless I let it sit for a short period of time. It is very erratic in this behavior, sometimes going weeks with no problems, and then acting up.

It sounds like you could have a faulty ignition switch. I would recommend getting a technician to test the switch to see if it is working correctly or if it needs to be replaced.

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