Huge win for car owners! All TSBs to be made public. The Center for Auto Safety just made the NHTSA (US Government) make public the full text of all TSBs from now on. They are the same organization that has petitioned the NHTSA & filed lawsuits to protect car owners over exploding gas tanks & other major safety issues. Whenever you drive in your car, you are safer thanks in part to a lot of work over the years by this small but very effective consumer advocacy group.

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definitely annoying
Typical Repair Cost:
No data
Average Mileage:
53,000 miles
Total Complaints:
1 complaints

Most Common Solutions:

  1. not sure (1 reports)
1998 Mercury Grand Marquis engine problems

engine problem

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1998 Mercury Grand Marquis Owner Comments

problem #1

Jul 092007

(reported on)

Grand Marquis GS 4.6L

  • Automatic transmission
  • 53,000 miles


I first noticed the 3-4second shudder during mild accelerations sometimes going thru 77mph, but never at steady-state speeds. It runs fine during hard accelerations.

When it happens, it feels like you're on a freeway & you've hit those "wake-up" bumps on the shoulder. The vibration also shows up when traveling on mild grades, but only lasts for a few seconds. I put in premium gasoline, thinking it maybe muffled engine knock, but no luck.

When I put it in park & step on the brakes & gas at the same time, I can't duplicate the shudder. What's the problem?

- , Ann Arbor, MI, USA

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