Rear Suspension bounce?

2009 MERCURY GRAND MARQUIS
32,400 MILES • 4.9L • V8 • 2WD • AUTOMATIC
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SIXTY6GTO
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The car has a very harsh ride but sits level. I believe the rear air suspension is holding air, but every small bump makes the back end bounce up and down. I do hear the vacuum pump runs for approximately 5 seconds prior to each engine start up. The car is the ultimate edition.
Feb 20, 2025 at 6:06 PM
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STRAILER
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Does this car have 32,000 miles on it? If not, I would say the rear shocks are bad or have come loose from their mounts. When the car is not moving can you push down and release on the rear of the car does it bounce up and down? If so let's look at the shock and then replace them to see if the mounts are all good. Here is how. Check out the images (below). Please upload pictures or videos in your response of any problems so we can see what to help you with.
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Feb 21, 2025 at 10:42 AM