Grand Marquis wanders in lane at highway speed; constantly having to correct. Mechanic says front suspension is fine & had 4 wheel alignment What is the problem?
What is your question?
Car did not wander at speed when bought 4 years old. Problem started slowly several years & 20K miles later. New tires several times made no difference, No mechanic can diagnose it. Only wanders at highway speed. Not getting worse for 10 years now, but never gets better. Any ideas what is causing this?
What makes this problem better or worse?
NA: only wanders at highway speed, regardless of pavement type.
How long has your 2006 Mercury Grand Marquis had this problem?
RepairPal Certified shops can diagnose and repair your 2006 Mercury Grand Marquis. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
I would check caster alignment angles versus specifications.
I would also check into the operation of the steering gear and perhaps adjust the gear accordingly.
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