Question about 2000 Mercury Grand Marquis

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My car was running fine yesterday, today it won't start. what could be the problem? it seems like it not getting any gas

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  • Mercury Master
  • 5,495 Answers

Hello, Check for a switch in the trunk, on the drivers side. If you have Air Suspension, the switch for the fuelpump is next to it. The switch has a reset button and you press and hold it down for about 2 seconds and then release it. This should reconnect the fuelpump and allow you to start the car.

The name for this switch is the Inertia switch. Its purpose is to cut off the fuel in the event of an accident. The switch can cut off when a door or trunklid is slammed at just the right frequency to trigger this safety switch. Once reset it should run normally.

If the switch keeps cutting out, you may need to replace it. It works on magnetism and sometimes the plating on the contacts erodes and it will disengage.

Posted on Mar 23, 2011

  • crashslam Apr 10, 2011

    I've checked the switch and it seems to not have any affect. the car now after having the fuelpump replaced will not turn over but has made some progess. I've had two different cars try to jump it. any suggestions

  • fordexpert Apr 10, 2011

    You need to have the primary Battery at full charge. The Antitheft system will cut the Voltage to the starter and if you defeat that feature, it will cut the Ignition sometimes. You have several Relays in the Powerbox. There is a fuelpump Relay and a PCM or EEC Relay. The multiple terminals on the Relays are tied together so if a PCM Relay is bad, even a brand new Fuelpump Relay will not get the signal to work.

    You started thinking the vehicle was not getting fuel, but it must have been turning the starter for you to say that. The problems in the fuelpump may have run down the Battery or blew a Relay. If you still have the old pump, test it to find out if it could have shorted. At least you will know. Then charge the battery, 13.2V to 13.6V is a full charge. If you can get a tool from the loaner program at the Autoparts, you can check your starter draw to see if you cooked it. Fordexpert

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SOURCE: !999 Ford Ranger

It could be the mass air flow sensor. Its mounted to the side of the air cleaner. Just unplug the electrical connection to bypass the unit. If this is the problem the vehicle should run smoothly.

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you could try to clean the mass air flow sensor

Posted on Oct 23, 2008

wracefans24
  • 1985 Answers

SOURCE: my car started fine yesterday...today..its just

you need to determine if you have spark at plugs while turning the engine over,or if you don't have enough fuel pressure to fire it up,you will need at least 55psi of fuel pressure at the fuel rail to start

Posted on Jan 20, 2010

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