Question about 1993 Mercury Grand Marquis

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Merc Grand Marquis, starts, idles rough for few seconds and dies.

Battery icon is lit up

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HI if you rev up the rpms does your light stays on ,If thats the case you need to replace your alternator have it check at autozone or rally s auto parts for free

Posted on Sep 25, 2009

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It is possible that you have a bad alternator which in turn is putting to much stress on your battery

Posted on Sep 25, 2009

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94 Merc Grand Marquis.... Runs rough from a cold start. Usually backfires a couple of times---feel it underneath me... then smooths out with acceleration. Seems like it's skipping at red lights and when...


Its sounding like it could have your timing off...either electrical, or internally. If all plugs have good spark, scratch electrical. Then you could be looking at a timing chain.

Oct 14, 2013 | 1994 Mercury Grand Marquis

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2002 merc grand marquis wont start battery was replaced 1 week ago


Does it not start or not crank ?
If it does not start, you will need to figure out if it is a lack of fuel to the injectors or lack of spark to the plugs to proceed.

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1987 Merc Grand Marquis, saving as "collector" car, last ran 6 months ago. Will start, run for 3-10 seconds, then runs out of gas and stalls. Will not start again unless sits for 15 miutes or so. It is...


You need to attach a pressure gauge to the schrader valve and measure the fuel pressure with the key on and also while running. You need to see about 40 lbs in both cases.

Mar 06, 2017 | 1987 Mercury Grand Marquis

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Once my 85 grand marquis heats up it runs rough and misses and dies when slowing to a stop, what could some possible problems be?


Drive it to Autozone or Oreillys and get a free scan of your motor. It can tell you what is wrong and save you money guessing.
It probably needs points and plugs to begin with.
There is a idle control part that works after the engine heats up. It is on the drivers side of the carburetor. It will help to be properly adjusted to prevent stalling. Try these few things and see if they help.

Sep 21, 2009 | 1985 Mercury Grand Marquis

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What are the igniton timing,firing order, spark plug gap specifications for 1998 Merc Grand Marquis with 400 cdl engine?


1998 Mercury Grand Marquis
4.6 liter V-8 VIN "W"

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I will get you the rest of the info in just a few hours...I am at work!

Aug 09, 2009 | 1978 Mercury Grand Marquis

2 Answers

1991 Mercury Grand Marquis - engine stalling


First thing that comes to mind is a clogged catalytic converter. Have someone rev while you put your hand next to the end of the tailpipe. Look inside for obstruction. It should be harder to not have your hand move as the engine races and it should sound clear and not muffled. Has this been coming on over a period of time or has it been sudden? Does it run OK for the first few seconds after starting for the day and then starts to die?

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1989 Grand Marquis 5.0 hesitation under load at 25, 40, 50 mph and slightly rough idle


What happens when you unplug and cap the vacuum line at the EGR valve? Does the problem go away? Before doing this does the car idle rough? If so perhaps the EGR is stuck open...

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