intermittent washboard effect while driving

Asked by Guru1PXTV Sep 21, 2019 at 09:26 AM about the 1997 Mercury Grand Marquis 4 Dr GS Sedan

Question type: Maintenance & Repair

what would cause an intermittent washboard effect while driving at highway
speed? Vehicle has been setting up for 5 years.

1 Answer

jetta_2125 answered 4 years ago

Check struts and also tires for dry rot. Sounds like struts are blown out. If you push down on front or rear bumper forcefully . The car should compress then rebound to normal ride height in 1 motion. If it keeps bouncing or seems spongy replace the struts.

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