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- Grand Marquis (https://www.mercuryforum.com/forum/grand-marquis-14/)

- - bump, bump, bump (https://www.mercuryforum.com/forum/grand-marquis-14/bump-bump-bump-5623/)

lvmymerc

May 24, 2011 11:09 AM

bump, bump, bump

My 2000 Grd Marq with 150,000 has developed a bump, bump. Kind of like going over a rumble strip. it is not the transmission and the front end does not shake.
I experience it mostly accelerating uphill. It has become annoying.
:confused:

ronnjonn

Jun 10, 2011 07:46 AM

change your pluggs, your having a misfire, if one of your plugs is heavily fouled change the coil pack too.

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