Question about 2000 Mercury Grand Marquis

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2000 mercury grand marquis Ls would not start on Friday i check all the fuses and relays still would not start and no spark. no power windows no wipers and can not get it to go in neutral and no radio.went out Saturday and just tried to start it and it started right up ran great so started checking the relays and i would pull one and it would stall so i knew that one was good started right back up and did it whit the other relays it would stall and start right back up and so on than after that got in it put my foot on break to back up and it died and has not started since could someone please help me. thanks Ron

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There are are few tests that MUST BE RUN to diagnose this no start, I speak from 30 years as a Ford dealer technican.
1. The engine in this car has Digital electronic fuel injection, this system is called the OBD2 electronic engine control system, when a fault occurs in the electronics of the system like a no start if it is a no spark ignition problem the system will detect the failure and store a fault code, to read this code you need at least a OBD2 fault code reader, they are available from any auto parts store for about $40 for the bottom end models and go up to about $1500 for the most advanced systems that the pro's use. The connector that this electronic system Scanner plugs into is in front of the driver under the dash panel, it has 16 electrical pins in the connector and is easy to spot as it sits by itself out in the open, you will need to read the stored fault codes and have a trained technican look at them to decide what the fault is based on the code received.

2. Next you need to see if it has fuel pressure, you can do this test first, and by the symptoms you have it does sound like the fuel pump has failed. To run a test to see if the fuel pump is the problem get a can of "Starting" fluid from any auto parts store, have a friend crank the engine and spray the starting fluid into the air hose to the engine from the air cleaner, if the engine starts and runs while the starting fluid is being sprayed then the in gas tank electric fuel pump is more than likely failed and will need to be replaced. To replace the fuel pump requires the gas tank be removed from the car, you will need a friend to help do this, the tank is held in place by 2 steel straps and the gas filler neck and the fuel lines and electrical connectors, remove the straps and then with a Hydraulic floor jack drop the tank down, the remove the fuel lines and electrical connectors, you will need a special tool kit to release the fuel lines and a really good set of hand tools a hydraulic floor jack and jack stands are a must, makesure the battery negative cable is disconnected before you start any work.

Posted on Mar 21, 2011


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