Question about Mercury Marquis

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1994 mercury grand marquis v8-281--4.6l

Car is running rough when starting ,and driveing a speeds 40mph --55-&faster the car has 51,500miles do not have a service maunal. Can you help?

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    How do I get my grand marquis off a storm drain? I backed over one when I was driving out of a drive way in reverse and the back left tire is about a few inches off the ground cuz the left side running board of the car is stuck on the top of the storm drain bout a quarter of a way off... Any thoughts?



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Ok odds are you just need a routine tune up. Plugs, fuel filter, air filter. Now this engine uses coil packs i think, so you wont have normal plug wires. The coil packs are individual and sit directly on the plugs. So it is possible you have a bad coil pack. These engines were known to have this problem in excess. So try the cheap fixes first. plugs, fuel filter...these two is the best two to try first.. The air filter wont cause a bad miss unless it is completely dobbed up. so just for your own good to change the air filter.Now if neither the plugs or fuel filter fixes this car try this. Each coil pack will have an individual plug on top of them. So listen closely to your engine. Unplug each coil pack one at a time, Now evry time you unhook a plug the engine should miss, so unplug one at a time, and if the engine does miss they are working properly. Now if you unhook one of these and there is no change in the idle of your engine, my friend you have found the problem. All you have to do if you find one that does not change the engine idle, you just go buy a coil pack and replace it. This should fix you right up

Posted on Sep 04, 2008


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Posted on Jan 02, 2017


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