Difficult to say without hearing the noise. It could be wheel bearing, brakes, fuel pump, plugged exhaust line or something wrong with the radio and it's comming out the rear speakers. Then again, it could be something altogether different. I think it is normal. I have 3 of them at my house. A Police Car and 2 LS's. All three do it and my mecanic said that they all seam to have started doing that about 10 or so years ago and not to worry about it. I asked when it did it on my First LS then I got the other two at other times and they all do it.
low on freon compressor kicking in and out
Just had my 2004 grand marquis convertor replaced (making an aweful noise). it cost me $250 for the part and then labor etc. total of bill for installing etc was $472.61.
Could be the Springs doing that. If it's a grinding noise, then it's the wheel bearings.
what clicking noise in the dash of 1997 mercury marquis
You can't, the serpentine belt (or fan belt) on a grand marquis is equiped with a self tensioner, if your belt is making noise it either needs to be replaced or one of the pulleys on the cars may be loose and would need to be replaced.
There could be many reasons why the 1993 Grand Marquis make noises when the doors lock. The wiring could be off, or the motor could be going out.
Its your bushings, they need to be replaced. About $200 at a shop.
I have a 1994 Grand Marquis and the buzzing noise that I hear every once in awhile is the load levelers (rear shock system) filling with air. Maybe this is what you are hearing and it is a coinencedence that it stops when you accelerate My 1994 Grand Marquis does something like that...it's the air intake thing (press the gas pedal, it moves a valve at the end of the overhead cam). That valve can stick open slightly and hum. You may notice the car idles faster when it buzzes. This can be fixed by going over the edge of the valve with fine sand paper.
I have a Grand Marquis and shortly after I start the car you hear a sound coming from the the engine side and that is the rear air suspension lifting the car up(the sound is the air being pumped into the airsuspension to lift the car)
Short of a complete engine rebuild, you could try a heavier viscosity synthetic oil. However, this is just a temporary fix at best. If you are hearing excessive lifter/rod noise, the engine is in need of major service.
More than likely the gears are stripping on the door lock actuator and will soon fail to work.
Which ever one or ones are making the noise, the lock actators have gone bad. The actuator comes as part of the door latch.