Question about 1998 Mercury Grand Marquis

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Car starts, then doesn't, then does, then doesn't

I had a fuel pump problem and got this resolved. I drove the car for about a solid month. One day after coming home from work, I pulled in the driveway, turned off the car and went inside. About 1/2 in hour later came back out to run to the store and it would crank but not turn over. I had about 1/2 tank of gas. Later that night I checked all the connections and fully charged the battery. The car did start, drove fine, turned it off and went to bed. Next morning, didn't work again. The weird thing is is sometimes it works and sometimes it doesn't. And when it starts it starts very easy and good. Before replacing the fuel pump I replaced all the spark plugs. I can reassure you the car starts very easy when it wants to crank over. Could this problem be related to the Ignition Control Module (ICM). The car cranks but occasionally won't start. And when it does start it rides all over without stalling. Yesterday after starting it I let it run idle then turned it on / off about five times. All five times it started. The next morning I tried again and it would not crank!! Very confusing. Please give me some ideas and things to check. Thanks.

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  • teahou May 11, 2010

    You are probably on the right track with the ignition module. I would go pick up a cheap, inline spark tester and next time it wont start, connect the tester (which takes 10 seconds) and have someone turn the key while you check for spark. If there is no spark then you know that either the ignition module is junk or there is an intermittent ECM signal to the ignition module. Check it out and let us know what happens.

  • gerry bissi May 11, 2010

    what do you mean it would crank but not turn over?

    Cranking is turning over.

  • yadayada
    yadayada May 11, 2010

    In order to get a timely answer to this long question please use the Live Chat Option of fixya website



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Check the fuel pump relay! It sounds like it is one of your relays. If it was an electrical or sensor problem, the check engine light would be on.

Posted on May 22, 2009


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Intermittent P0191 error code

I had a similar problem that turned out to be dirt contaminated gasoline. The "fix" was always to replace the fuel filter but it would not stay fixed. In particular, each time I started having problems it was after I let the gas tank level get low.

What I did that you can consider was:
  1. But a new fuel filter.
  2. Get a 5 gallon gas can.filled with fresh gas.
  3. Get some cheap gasoline proof container (or several containers) for waste gasoline.
  4. Make a "vacuum cleaner" out of an electric in-line low pressure gas pump, some low pressure gas hose, and a couple of pieces of copper tube, 20 ft of two conductor wire, and two alligator clips. It connects hydraulically copper tube to suck out the gas tank, fuel hose, pump, fuel hose, copper tube to go into the gas can. The wire and clips are to hook the fuel pump to your car battery.
  5. Drive the car until the fuel level is low.
  6. Remove the fuel pump module.
  7. Vacuum the gas tank into the waste gas container through the opening left by the fuel module. Try to get the dirt off the bottom.
  8. When you have vacuumed all you can get, stop awhile and let the dirt settle in the waste container.
  9. Vacuum the gasoline from the waste container back into the gas tank. Vacuum high in the container so the dirt stays in the waste. Try to wash any dirt in the gas tank to below the fuel module opening.
  10. Stop a while and let the dirt settle.
  11. Repeat vacuuming and washing as many times as needed to get the tank clean and empty.
  12. Inspect the tank interior with a mirror and flashlight looking for rust, dirt, etc.
  13. Replace the fuel module.
  14. Install the new fuel filter.
  15. Pour in the new gasoline.
And hopefully you are good to go.

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96 Benz ran out of gas other day, got it filled up & drove home (20 miles). Next day drove about 40 miles, left car running in park for about 15 min, when I left car was stalling like it was running o

You never leave a car running, as it will
overheat the Exhaust Converter
When you run out of fuel, you sometimes
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It depends on gas to lubricate it,as strange as it sounds
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I would strongly suggest you get a diagnostic test carried out to verify this fault, althoug it sounds like a main engine relay or ecu problem.
I am sure there are mobile technicians in your area who can pop round and test this fault for you.

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Can a faulty ignition switch ALONE cause 0 fuel pressure when cranking?

If you have 100,000 miles or close to it you needed or would need a fuel pump anyway.Your mechanic sounds like a knowledgeable skilled honest one, he didn't even charge you for some items.
Stick with him/her as you both will get all the problems solved.
The work he has done is smart logical work so far.
Next time it does not start right away,keep cranking the engine to get the oil pressure up.If it starts when the oil pressure builds it may be you are not getting a prime cycle when you first turn on the key some times.

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Perhaps when the fuel pump was replaced, the filter was not replaced, or the dirt in the tank was not cleaned out. Sometimes these problems are a result of the filter getting clogged up and fuel is not able to reach the fuel rail. The car sits for a while, the sediment falls from the filter, it then starts and runs for a time, all the while, little by little, the sediment recollects and starves the fuel rail again.

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