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You need 4 things. Fuel, Oxygen, Spark and Compression. If any one of these elements are missing then it will not start. By a process of elimination you should be able to determine which one is missing, pretty quickly. 90% of the time it is a sensor that is not sending correct information to the onboard computer. A fauly sensor is easy to figure out if you plug into the computer and read the error codes. Nowdays, cars tell you what is wrong.

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Q: Why does a 1998 Grand Marquis turn over but not start?
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