Shudder During Acceleration

4.0

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

A D V E R T I S E M E N T S

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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