CAR

1991 Mercury Marquis

Tiny

tweezy1325

February, 12, 2011 AT 8:25 PM

My 91 grand marquis overdrive gear wont work past 40 mph is that normal

1 Answer

Tiny

Jacobandnickolas

March, 13, 2011 AT 3:51 AM

The overdrive should work after 40mph not before. If the check engine light is on, have the computer scanned for trouble codes.

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