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2001 mercury grand marquis mysterious drivetrain vibration
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Eric T
New User
Sep 24, 2013, 12:34 PM
Post #1 of 6
(3028 views)
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2001 mercury grand marquis mysterious drivetrain vibration
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My car has an intermittant vibration coming from the drive train. Comes and goes, happens after bumps,pavement style changes, on corners, driving straight, no common threads. Changed U-joints,been to two transmission shops,alignment shop. changed/ balanced/ rotated tires and the problem persists. The front end is a bit tired but doesn't need changed out yet. Drives fine, its just that vibration. Any suggestions?
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Sep 24, 2013, 1:30 PM
Post #2 of 6
(3014 views)
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Re: 2001 mercury grand marquis mysterious drivetrain vibration
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You've checked out a lot! Not sure what you mean by a tired front end and you wouldn't just change it out but fix worn parts. Not much tolerance for wear at all. Some parts last eons some don't?
You seem to have ruled out tires or wheels by rotating it should have changed behavior and that's what you need to find it what when you try something changes it.
Since it seems so much has been ruled out just maybe there is a resonance in the exhaust system. YES - They can cause a vibration and some (not this car TMK) use counter weight balancers - my own does!
Put it on your maybe list that it somehow is the issue and very tricky to know so if so at all. Trust all the checking has ruled out engine and trans mounts, and integrity of all strut bushings of rear end.
By the subject line you seem to be sure it's drivetrain more than wheel something. Will it change if you say try going in or out of overdrive? I'm just groping at some ideas.
One more for now and dang hard to tell is driveshaft itself never mind the u-joints they can do that and can feel like a come and go thing but usually is predictable when it would do it and would be better or worse with load most likely. This stuff unless something obvious is worn can be a real pill to hone in on what is doing it,
T
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Eric T
New User
Sep 24, 2013, 1:40 PM
Post #3 of 6
(3009 views)
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Re: 2001 mercury grand marquis mysterious drivetrain vibration
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No,I haven't changed wheels. guess I could, thought that would have shown up in a balancing...hmmm. resonance is an interesting thought too. I will post when resolved. thank-you. Eric T. Good travels
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Sep 24, 2013, 2:13 PM
Post #4 of 6
(3006 views)
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Re: 2001 mercury grand marquis mysterious drivetrain vibration
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Wheels - they would balance if untrue but since you rotated them it should have changed. When balancing a wheel the tech should be looking at it at least with this complaint. You could really balance a square wheel!
Resonance is tricky as said. Think - take a tuning fork and then hold it with you fingers it shuts up type thing. Never heard of the complaint on this generation of this car but was on my mind. I would if after a good drive and feeling it do this just have the gut feeling to chase that or not that's hard to put into words. Then just put a universal rubber isolated hanger temporarily probably on tail pipe near end giving it some pull one way or the other and see if that changed it or made it go away. I told this could be tricky,
T
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bakon2
New User
Mar 24, 2014, 7:07 PM
Post #5 of 6
(2822 views)
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Re: 2001 mercury grand marquis mysterious drivetrain vibration
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Mine does the same thing only it seems it is coming from the front passenger side of the front end. I do notice that if I can give it has very quickly that it stops...but it happens a lot. Have you figured it out yet?
(This post was edited by bakon2 on Mar 24, 2014, 7:09 PM)
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Eric T
New User
Mar 24, 2014, 8:47 PM
Post #6 of 6
(2806 views)
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Re: 2001 mercury grand marquis mysterious drivetrain vibration
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 I figured out that I had a bad rim. Even with rotating tires around the problem had just 'changed flavors' and shifted location of 'vibration source'. Figured it out when I had gotten a set of stock rims and all season tires for winter. My apologies for not posting.
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