I own a 1996 Grand Marquis LS. When I purchased it, I also was a little uncomfortable with the steering and handling, but accepted it as the nature of the beast.
A little over a year ago, I had a new set of Toyo Tourevo LS directional tires installed. What a difference! The improvement in handling, cornering, control and tracking is absolutely profound! The ride is also much better. My Grand Marquis has 162,000 miles on it, and I've experienced no problems with it at all. It has been the most reliable car I've owned... and I'm 61 years old. I've had a lot of cars. The problem with yours may possibly be associated with the tires. I purchase the Tourevo's from Les Schwab here on the West Coast. Hope this helps... don't give up on her yet!
I too recently purchased a Mercury Grand Marquis LS. I had previously owned a 1985 sedan, and then a 1985 Colony Park LS, which I drove for 10 years, having bought it when it was 5 years old.
The current Marquis is a 2001 LS with 13,000 original miles. It's like a new car, except I can't get used to the steering either, and won't drive it on the highway. Seems odd, as highway driving is what these cars were built for.
The car had the original 10 year old Michelins, which I replaced about 5 months ago. I took the car to a professional alignment shop that does only front end work that I've been going to for years. I suspected the tires, and when I noticed the recent post about the Toyo directional tires, I'm wondering if I should sell these new Michelins and try the Toyos. We're thinking of selling the Marquis because of the steering. I'd hate to sell this car if the tires are the problem, because it is otherwise a great car.
I'm the poster on the Toyo Tourevo LS directional tires. The tech that installed them set the pressure at 32 psi. He told me that pressures higher than that tend to cause the tires to ride more on the center of the tread. I keep them at 32 psi and they wear evenly across the tread. They still look new. I love 'em. Hope this helps. Good Luck!
Can someone tell me the fuse line up? I have no book, so I can find the blower resister. Need help 716-532-4180.
I have a 2001 Police Interceptor that has the steering issue also. Plus the steering wheel by default is to the left. I'm looking at buying a Mercury Grand Marquis also, and it has the exact same steering problems as my Interceptor, except for the Interceptor handles much better and has a ton more power. The Grand Marquis is a dog on the road.