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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.

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โˆ™ 2007-10-25 14:31:17
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Q: Why would a 1990 Mercury Grand Marquis make a high pitched noise in the rear of the car?
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