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Injectors leaking. Raw fuel is making its way into the exhaust through the engine. This is not safe. Take it to the dealer.

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Q: Why does 2005 Mercury Grand Marquis backfire upon restart after cooling off from extended drive?
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What degree of thermostatic in a 1999 mercury grand marquis will work properly with the obd 2 system?

On a 1999 Mercury Grand Marquis : The Original Equipment engine cooling thermostat would have been ( around 192 * Fahrenheit )


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