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My Grand Marquis Won't Start

by Dan Swords

There are two types of potential problems if your Grand Marquis won't start. Either the engine won't crank, or the engine will crank but won't start. Each problem requires a different approach. If your engine won't crank, there is likely a problem in the electrical system. If it will crank but won't start, your Grand Marquis probably has an issue with its engine timing or fuel and air delivery system. Take a few quick steps to troubleshoot the situation.

Engine will not crank.

Check the battery. Verify that the terminals are clean and free of corrosion, oil and dirt. Connect the voltmeter to the battery. Start the engine while monitoring the battery voltage. The voltage should not drop below 10 volts. If the voltage is less than 10 volts, charge the battery and retest.

Start the engine and monitor the battery voltage while the alternator is charging. The voltage should be approximately 12.8 volts. If the voltage is less than 12.8 volts, verify that the alternator is operating properly.

Measure the voltage at the starter solenoid. The voltage should be approximately 12 volts while the solenoid is energized. If the voltage is correct, verify that the starter is operating properly. If the voltage is not correct, verify that the starter relay is operating properly.

Engine cranks but will not start

Check the fuel filter and replace if needed. A clogged filter will limit the fuel being sent to the injection system.

Check the air filter and replace as needed.

Have a qualified auto technician look at the engine. He will connect an electronic service tool to monitor the engine sensors and Electronic Control Module (ECM). He also will use the service tool to verify engine timing and fuel delivery.

Items you will need

About the Author

Dan Swords has been a technical writer since 1991. He specializes in computer and electronic topics and earned an Associates In Applied Science in electronic engineering technology from Illinois Central College and is furthering his education with classes in computer science and culinary arts.

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  • dead battery image by Katrina Miller from