Question about 1999 Mercury Grand Marquis

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99 Grand Marquis won't stay started when engine cold.

It cranks up fine but dies quickly when the engine is not up to operating temp. It runs fine at speed (even cold), but dies when idling and cold. I have already changed the fuel filter. Any ideas. I can not bring up any codes on OBD unit.

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  • Anonymous Nov 15, 2008

    I just had the fuel filter replaced at 85000 miles. A day or so latter I was coming home and I had trouble the hole way home keeping the car running at 30 mph to a stop the car would run ruff and die. I thought I had a little water in line so I put heat in the tank but, that didn't help. I notice my battery termenals were corroded so I clean the termenals and I know when you disconet the battery fully you have to restart the car in a sequens or it will not start and run. So I depress the gas pedel fully and start the car and drive it in differnet driving, like a drive across town or on the high way with different speeds and stoppes. That may have helped but after letting the car sit for and hour I tried to start it and had the same problem. So I check air filter for blockage and I tried to start the car I hand trouble the first time but, I heard a little noise like something closing or a click and tried to start the car agian and it stared and it stayed idling and stopped it waited and started it agian and, idled just fine! So the other solution was right on and it had to do with SRC. thanks and good luck.

  • Anonymous Dec 04, 2008

    My Grand Marquis 2000 has the same problem right now.
    I just did what emissionwiz said above.
    Waiting for a few days to see...

  • Anonymous Mar 28, 2014

    changed fuel filter and cranked right up .ran for five minutes and died.would not restart. next day cranked and ran for a minute then died.

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Here is the most common cause of this stall, it is the idle speed control air-bypass valve and throttle valve, they get full of gunk over the miles and cause idle issues (stalls) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake

Posted on Nov 06, 2008

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