Mercury Grand Marquis Repair and Maintenance
A guide to problems, costs, maintenance and repair for your Mercury Grand Marquis
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Mercury Grand Marquis ProblemsIntake Manifold May Crack Leaking Coolant Behind the Alternator
The composite (plastic) intake manifold may crack near the thermostat housing and cause a coolant leak. Ford released an updated manifold that was reinforced to prevent a recurrence. No recall was issued for this problem but Ford did extend the warranty to seven years on some models from the date of purchase.
The EGR valve position (EVP) sensor can fail on this vehicle. The EVP sensor measures the EGR valve position and transmits the date to the engine control computer. If it fails, drivability and fuel economy can suffer, the Check Engine Light will commonly illuminate.
Mercury Grand Marquis QuestionsHeadlights won't come on. Replaced LCM under warranty. Parking lights and all other lights work. All fuses are good. My mechanic said my headlight switch and Multifunction switch (turn signal lever) are working. He believes there may be a burnt wire? (1 answer)
My headlights were working on and off and I read that there was a recall on the LCM. I was holding in the turn signal lever and the lights would stay on, however the day before I brought the car in to change the LCM the lights did not work at all. I had the LCM changed and the lights still don...
Mercury Grand Marquis RecallsHeadlights Fail To Operate
The lighting control module may fail, resulting in the loss of headlight operation. Dealers will replace the lighting control module free of charge to resolve the concern.
Certain vehicles are being recalled because the upper intermediate steering shaft could separate resulting in loss of steering control. This recall includes models previously recalled under campaign #13V-385, these vehicles may have been incorrectly repaired. Dealers will inspect and replace the upper immediate shaft if necessary. If the steering column lower bearing has separated, a retainer clip will be installed.
The intermediate shafts connect the steering column to the steering gear. Vehicles in areas where salt is used to de-ice the roads are being recalled because severe corrosion can damage the lower intermediate steering shaft. This can cause the upper intermediate shaft to collapse and separate at the lower steering column bearing. Separation will result in complete loss of steering ability. Dealers will replace the lower intermediate steering shaft and inspect the upper intermediate shaft and steering column lower bearing for damage, they will be repaired or replaced as necessary. If the steering column lower bearing has separated, a retainer clip will be installed.
Additionally, Vehicle owners located where salt is not used who have concerns regarding their steering will have a one-time option to have their vehicles inspected and, if necessary, repaired.