Question about 1993 Mercury Grand Marquis

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1993 Mercury Grand Marquis Problem:

Have a bucking problem. Changed spark plugs did not help. Car starts easy and runs smooth as glass. Hit the gas and it will throw you back in your seat. Get on the hwy doing 60 and boom..boom.....boom..boom..hard bucking all the way to work 60- 80 times or more. Could this be a fuel filter? or something more serious. Checked the wires to the coil packs and they are clean. Please help with advice.

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  • god_666 Sep 03, 2008

    I have a similar problem...the car starts and runs fine but when I give it gas is sputters and won't go and then it will. I replaced the fuel filter and that helped but not for long. I think I should have been a mechanic! Any help would be appreciated...thanks!



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Well in my madness of trying to figure it out with mama wanting it fixed and fixed fast and it being Hot! outside. I set back in the cool air with drink in hand wishing she had to do it instead of me, thought about it and said Ahhhhh! Coil pack or wires. I chose "coil pack" The problem is gone, Mama is happy and the world is right once again.
Coil pack would heat up and then breakdown.

Posted on Jul 25, 2008

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It might be the valves not sealing and/or Engine timing could be off

Posted on Nov 19, 2008


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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.

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Common problem the the hard pcv line that runs towards the back of the motor from the pcv valve, they commonly rub parts, which causes holes in the plastic and a vacuun leak. It's easy the check just follow it back and around feel and listen for leaks. When have you changed the spark plugs? Trouble light on?

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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
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Check you've reinstalled the wires to the correct cylinders - if you've got this wrong, then you'll have problems.
Off hand, I'm afraid I don't know your cylinder order however - sorry, you'll have to check a manual for that one (unless someone else on here knows it off the top of their head?)
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Uncle Melvie

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