2004 Mercury Gand Marquis will not start

Joseph Leonard

Asked by Mar 19, 2014 at 08:26 PM about the 2004 Mercury Grand Marquis

Question type: Maintenance & Repair

Searched for: My neighbor has a 2004 Mercury Marquis that has and intermittant starting problem. It will operate fine for 3 or 4 weeks, then you go to start it and it will not start. It turns over fine. Battery is good. I tried battery disconnect cycle thinking it might reset the computer logic, key on and off several times, and checked fuses. One time it started right up after that. The next time no help. It was towed to a mechanic and when he got in it, it started. He did a diagnostic on it and determined it was a crank position sensor issue and replaced it. But, 3 weeks later it  happend again. I have heard that some makes of cars need to clear old timming circuit faults in the computer to function properly. Is there a manual way that I can try that with this car or do you know anything elase I can try. I think there is a maintenance bulletin out for starting problems on this car, but no recall to fix it.  Note:  I got it started this last time by removing the cam sensor and crank sensor and reinstalling it along with a battery disconnect reset.  it worked, but 3 days later, it would not start again. Now that doesn't work either.  Thanks!

4 Answers

Tracy Hooks

Try this the next time it won't start: Either hook up a fuel pressure gauge or reach under and bang on the fuel tank. Your concern is most likely not an electronic concern - these things are practically bullet-proof computer-wise, but the Fuel Pump is a common intermittent failure that will only get worse over time. If you don't have a scan tool that will allow you to watch PIDs, you'll be throwing parts (and money) at it until the cows come home - or you go broke. No such thing as clearing old timing faults or anything like that. If there's a DTC - the Check Engine Light will come on. I've seen it lots and lots of times in our fleet. Dies on the officer or won't restart - gets towed in, runs fine, gets towed in again, finally, someone checks the fuel pressure and the actual voltage and pressure PIDs (or bangs on the fuel tank with a rubber mallet) and the darned thing starts. I'm willing to bet an entire Nickel that your Fuel Pump is failing!

2 out of 2 people think this is helpful.
Best Answer
Joseph Leonard

You were right on! did not have the test equipment to check fuel pressures, but Tried the rubber mallet trick on the gas tank and got it started once more. As you thought, the fuel pump finally gave up and my neighbor had it towed to the Ford place where they confirmed the fuel pump was bad and replaced it. Thanks for your help!

1 out of 1 people think this is helpful.
Tracy Hooks

You are very welcome!


Please answer my question

Your Answer

Add photo

Related Questions

Grand Marquis

Looking for a Used Grand Marquis in your area?

CarGurus has 2,558 nationwide Grand Marquis listings starting at $1,300.


Search Mercury Grand Marquis Questions

Mercury Grand Marquis Experts

#1 Tracy Hooks
Tracy Hooks
Reputation 4,820
#2 kbro
Reputation 1,910
#3 Js08016
Reputation 1,440
View All

Related Models For Sale

Used Ford Crown Victoria"
11 Great Deals out of 1,654 listings starting at $1,950
Used Lincoln Town Car"
48 Great Deals out of 2,364 listings starting at $1,542
Used Chevrolet Impala"
932 Great Deals out of 35,698 listings starting at $1,500
Used Mercury Marauder"
51 listings starting at $7,300
Used Cadillac DeVille"
2,378 listings starting at $1,495
Used Ford F-150"
3,268 Great Deals out of 216,650 listings starting at $1,500
Used Honda Accord"
1,255 Great Deals out of 78,694 listings starting at $1,400
Used Ford Taurus"
362 Great Deals out of 23,103 listings starting at $1,400
Used Ford Mustang"
731 Great Deals out of 41,065 listings starting at $900
Used Toyota Camry"
1,587 Great Deals out of 98,372 listings starting at $895
Used Chrysler 300"
582 Great Deals out of 20,787 listings starting at $1,490
Used Chevrolet Tahoe"
1,076 Great Deals out of 36,075 listings starting at $1,700

Used Cars For Sale

2011 Mercury Grand Marquis For Sale
5 Great Deals out of 44 listings starting at $4,995
2010 Mercury Grand Marquis For Sale
7 Great Deals out of 118 listings starting at $3,299
2009 Mercury Grand Marquis For Sale
5 Great Deals out of 135 listings starting at $2,995
2008 Mercury Grand Marquis For Sale
5 Great Deals out of 194 listings starting at $2,500
2007 Mercury Grand Marquis For Sale
11 Great Deals out of 198 listings starting at $1,993