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While it may be any number of other things, having a mismatched or failed computer chip in the key will give you the symptoms you describe...and considering the fact that you just changed the ignition, that'd be a good place to start.

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โˆ™ 2006-04-09 17:45:39
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Q: You just replaced a broken ignition on your 2003 Ford F150 and it turns over now but it still won't fire could it be a computer chip in the key or a safety switch or fuse that needs replacing also?
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