Suspension Front End Vibration

Discussion in 'Fox 5.0 Mustang Tech' started by cdurbin, Aug 19, 2013.


  1. cdurbin

    cdurbin Active Member

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    Looking to get some advice or direction for some of you gurus on here. I have a slight vibration at low speeds and it feels like it is coming from the front end. It's almost like a bouncing feeling if that makes sense. I only notice it at low speeds and it seems to only happen when I drive the car after it has been sitting a bit. After I drive it for a while it seems to level out on it's own. Not sure where to start troubleshooting on this one. Any ideas? Thanks
     
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  2. stykthyn

    stykthyn Commander of the snuggie cultists

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    does it feel engine related like low rpm bucking?
     
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  3. MFE92

    MFE92 Active Member

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    Your tires are flat-spotting due to being parked for extended periods. It takes a while to get them warm and flexible and rounded out again.
     
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  4. jAEded

    jAEded Active Member

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    +1
     
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  5. cdurbin

    cdurbin Active Member

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    Not really. Feels more like something drive train or suspension related.
     
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  6. cdurbin

    cdurbin Active Member

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    How long would you consider "extended periods"? It's my daily driver so it doesn't sit for that long.
     
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  7. jAEded

    jAEded Active Member

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    It would need to sit around a week or more. My car would do it after sitting a few weeks.
     
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  8. cdurbin

    cdurbin Active Member

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    Gotcha. In that case, I doubt that is the issue. The car only sits overnight or maybe a couple of days during the weekend at most.
    Thanks for the info though. I learned something which is always a plus.
     
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  9. cdurbin

    cdurbin Active Member

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    Found this chart online. Seems fairly handy for future reference.
     

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  10. MFE92

    MFE92 Active Member

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    It depends on the tires, and the time they take to normalize depends on temps. I've had extreme-performance summer tires that would flat-spot noticeably just being parked over night, and they'd be back to normal in a mile or two unless it was very cold out, in which case it could take several miles. Some tires won't do it til they've been parked for weeks.
     
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  11. flyinhigh90

    flyinhigh90 Member

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    you can always balance your tires or rotating even the smallest weight that fell off cant make that vibration... warped rotors even not applying the brakes can make that vibration ... driveshaft loss of weights that can be a problem also loose ball joints out of round wheels... its a proses of elimination those are sum hints good luck
     
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  12. cdurbin

    cdurbin Active Member

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    I appreciate the input. I don't think it's the brakes because I just put new rotors and pads all around about 3 weeks ago. Plus the vibration was there before I changed them. The U-joints are about 5 months old but that doesn't mean they couldn't be bad. I think I will start with a rotate and balance and go from there. Thanks again.
     
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  13. RealSpeed

    RealSpeed New Member

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    When did it start doing it? sometimes rotors are not perfect even when they are new
     
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  14. BANGERSTANGER76

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    I would also recommend balance and rotating your tires or if it fits the budget new tires all together. Your description definately sounds like a tire or tires could be the culprit. Also recheck that driveshaft. Sometimes if you remove them and dont put it back exactly where it was it can cause vibration. Good luck with it.
     
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    Last edited: Aug 21, 2013
  15. cdurbin

    cdurbin Active Member

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    Yeah I'll probably have the tires looked at first. I don't think I need to replace them. They are only about 11 months old and have tons of tread left. I only drive back and forth to work (15 miles) and around town. I've got an aluminum driveshaft I bought used but I want to get it checked for balance before I install it. Maybe that will be next in line. Thanks
     
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  16. MFE92

    MFE92 Active Member

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    The fact that the problem goes away after a while points away from mechanical problems. What kind of tires are they, what size, and what inflation pressure?
     
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  17. mikestang63

    mikestang63 Mustang Master

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    wheel balance problems normally don't show up until the 50-60 mph range.

    Jack up the front end overnight and see if the problem goes away. Then you will know it's the tires flat spotting.
     
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  18. cdurbin

    cdurbin Active Member

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    They are Cooper Zeon RS3-A, 245/45/17, I think they are set at around 35psi but I'm not positive.
     
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  19. 7991LXnSHO

    7991LXnSHO Well-Known Member

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    Here are a couple of temp related guesses you may not have thought of.
    1. If it can be felt mainly through the steering wheel, it could be an old PS rack with morning sickness. Does it get worse in the cold, how is the fluid condition and how many miles are on the rack and pump? Every Fox body I have owned needed a rack eventually, and they can do some weird things while warming up. There are not many things that go away when warm like this.

    2. It could have to do with a cold misfire condition - see diagnostics from the computer to test the cylinder balance.
     
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