Question about 1993 Mercury Grand Marquis

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1993 mercury grand marquis idles rough when you stop at a long red light other wise runs fine

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Red light keep flashing how to bypass

Posted on Feb 19, 2013

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Sounds like a vacuum leak or a dirty pcv valve.

Posted on Sep 15, 2010

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Jan 11, 2016 | 2006 Mercury Grand Marquis

1 Answer

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

1 Answer

My 1993 mercury grand marquis has a vacuum leak between back of engine and firewall. the pvc has been changed, all plugs and plugs wires were changed. it idles very rough at stop lights and now after a...


it sounds like you may have 2 problems.
1st vacuum leaks are fairly easy to find if they change idle/accelleration,alot of times you can hear
it,the use of carberator cleaner spraying different vac hoses & gaskets while engine idles to see a difference in the way the engine idles(goes up/ down in rpm's)or using a unlit propane torch.if its a very tiny vac leak then a smoke test can be done.
your hunting to find rev/drive maybe a worn switch or linkage

Jul 16, 2011 | 1993 Mercury Grand Marquis

2 Answers

Service engine light came on, on my 1995 Mercury Grand Marquis LS


i would first change the fuel filter with it being run low in fuel it may have picked up some trash off the bottom of the tank so change the fuel filter and see if it runs better

Oct 19, 2009 | 1995 Mercury Grand Marquis

2 Answers

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


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

Sep 25, 2009 | 1993 Mercury Grand Marquis

1 Answer

Engine stalls ,hard to startrun rough


Service Engine light came on and stays on and this is on my 1995 Grand Marquis LS 4.6 litre Engine. It is now idling a little rough

Sep 09, 2009 | Mercury Grand Marquis Cars & Trucks

2 Answers

1993 gran marquis hesitates and idles rough with check engine light on


get code checked at autozone or advanced auto for free. Probably 02 or egr sensor

Jul 20, 2009 | 1993 Mercury Grand Marquis

1 Answer

Engine light is on and car is idling poorly.


Replace your spark plugs, and make sure all spark plug leads are fitted correctly.


May 24, 2009 | 2006 Mercury Grand Marquis

1 Answer

Car cant rev up,til it's warm


Clean the MAF sensor with electrical cleaner then blow dry with light shop air or just let air dry.then disconnect battery for about 30 minutes to reset keep alive memory.Should take care of your problem.

Feb 09, 2009 | 1995 Mercury Grand Marquis

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