1999 Mercury Marquis Car shakes on highway at 60mph

ANDREWPERC

MEMBER
1999 MERCURY MARQUIS
V8
2WD
AUTOMATIC
129,000 MILES

Yes I'm inquiring about my car's poor handling on the highway. I just had the shocks replaced and the car still is very bumpy. Also, I had the bushings replaced; which consequently, has resulted in a new sound, a squeaky sound now. I took my car back to the mechanic, and he says the shocks are fine, and doesn't hear the sounds that I hear. I'm really about had it with this car. So, do I need to replace my tires(to better complement the new shocks). Or do I need new springs? I'm really uncertain if I should continue to put money into this car or get a new one. Secondly, the check engine light came on-a code came up regarding the cataylic converter, mechanic says it just might be bad gas, nothing to worry about. Any help, would be most appreciated.

1 Reply

JACOBANDNICKOLAS

MECHANIC
108,200 POSTS

I would try having the tires rebalanced. Also, let me know where you feel the vibration the most, the steering wheel or the seat. Next, if the tires are in good condition, they should be fine unless there is a shifted belt in them.

As far as the shocks, they should have provided a smoother stiffer ride. Remember, they are what stops the car from bouncing. Try this test. Bounce the car and see if it stops bouncing within three bounces. If it doesn't, the shocks he got are either bad or just really cheap shocks that can't handle the weight of this vehicle.

As far as the code, have you lost any power?

Let me know.
Joe