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It will be a timing belt not a chain. The engine will turn over much faster, pull one spark plug wire off a plug and stick a Phillips screwdriver in it and hold the shaft next to the plug and check for a spark. If there isn't one, it is most likely the timing belt. Hold the handle of the screwdriver so you don't get shocked.

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12y ago
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Q: How do you know when your timing chain has broke in a 1998 Pontiac grand prix 3.8?
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