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2000 Mercury Gr. Marq Ls diagnostic please
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rian26
New User
Jun 29, 2011, 9:46 PM
Post #1 of 2
(1984 views)
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2000 Mercury Gr. Marq Ls diagnostic please
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Hello, I have a 2000 Mercury Grand Marquis LS 4.6. The car was sitting for about a year and a half. I just recently drove it to get the oil changed and drove it around for a couple days. It was driving fine, pretty smooth and then I turned it off for 1 minute and tried to start it back up but it acted as if it lost most of its life. The key turned over fine and the first couple of times it almost sounded like/felt like it was starting but so slight that it just faded to stall. Now it won't start at all. Everything has power and the battery looks good. We tried to jump it but that didn't work. When I was driving it around, it seemed as though the transmission gears at times were a little more jumpy then normal. I'm thinking possibly something with the fuel injection or filters or something. When I did get it started for more then oh 15 seconds the engine got a little shaky and a little rough and then it died. I feel like it is choking. There was never any smoke but there was a little water coming from the exhaust. Any ideas would be greatly appreciated. Thanks
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Hammer Time
Ultimate Carjunky
/ Moderator
Jun 30, 2011, 3:14 AM
Post #2 of 2
(1968 views)
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Re: 2000 Mercury Gr. Marq Ls diagnostic please
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All "crank, no start" conditions are approached in the same way. Every engine requires certain functions to be able to run. Some of these functions rely on specific components to work and some components are part of more than one function so it is important to see the whole picture to be able to conclude anything about what may have failed. Also, these functions can ONLY be tested during the failure. Any other time and they will simply test good because the problem isn't present at the moment.
If you approach this in any other way, you are merely guessing and that only serves to replace unnecessary parts and wastes money.
Every engine requires spark, fuel and compression to run. That's what we have to look for.
These are the basics that need to be tested and will give us the info required to isolate a cause.
1) Test for spark at the plug end of the wire using a spark tester. If none found, check for power supply on the + terminal of the coil with the key on.
2) Test for injector pulse using a small bulb called a noid light. If none found, check for power supply at one side of the injector with the key on.
3) Use a fuel pressure gauge to test for correct fuel pressure, also noticing if the pressure holds when key is shut off.
4) If all of these things check good, then you would need to do a complete compression test.
Once you have determined which of these functions has dropped out,
you will know which system is having the problem.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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