Thread: Vibration.

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  1. #1 Vibration. 
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    Thought I would start this thread now to get it going.

    This is the ďofficialĒ thread regarding my issue mentioned in my introductory thread.

    It seems that the car has a bad vibration accelerating. More so pronounced on acceleration, even worse when turning or going around curves under acceleration. Forget about anything above 70mph, feels like the challenger shuttle on re-entry.

    I believe itís the cvís causing this, mostly due in part to the car being ďslammedĒ for lack of a better term. I was thinking about replacing the cvís and going back to OEM suspension. However, I like the look. But, at the same time, I am getting older, a disabled vet who has major, major back issues, and it is fairly difficult to get in and out. That said, maybe OEM is the right choice.

    I would replace struts and springs first, but this vibration is so bad it needs to be addressed first and foremost.

    Stay tuned and I will make sure to post pictures and lots of description as I go forward, until then, itís off to work I go after dinner, have a great evening!


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  3. #2 Re: Vibration. 
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    Maybe Iíll get to work on her this weekend. Had some ot this week due to Indy car testing, completely worn out, have to finish some work at the barn tomorrow as well as blow leaves in the backyard. Just an update to say I havenít forgotten, just been stupid busy with work.


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  5. #3 Re: Vibration. 
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    Well, been a busy few weeks. Havenít had the chance to do much. But, a new issue has arisen, or rather Iím noticing it because I have been trying to figure out when exactly it happens.

    Hereís the issue. The car is surging, or rather, trans slipping. Sheís fine under heavy acceleration and even moderate. But, when in drive, it will surge like a slip repeatedly. I tested it going up hill this morning. Let it get into od and settled, starts surging/slipping, give a bit of gas, it comes out of lockup (I think) and the issue goes away entirely. To verify that it was not downshifting to third, once it exited lock up and the issue stopped, I shifted to third, and it downshifted. So I think 4th(?) is still good. Just the converter is failing. What do you all think? I tried searching and the only thread I found had three posts with no solution (donít you just hate that!).


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  6. #4 Re: Vibration. 
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    trans or possible engines surging?
    08 grand prix NA3800
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  7. #5 Re: Vibration. 
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    Definitely not the engine. 100% trans acting weird. It only does it during lock up.


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  8. #6 Re: Vibration. 
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    RE; vibration - if you are significantly lowered it messes up the CV angle. do you have shortened dogbones, they move the engine forward to relieve some of the angle. other option is cradle spacers.

    for your trans issue read this TCC rpm oscillation and see if it describes your symptoms
    --
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  10. #7 Re: Vibration. 
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    Quote Originally Posted by mguzzo View Post
    RE; vibration - if you are significantly lowered it messes up the CV angle. do you have shortened dogbones, they move the engine forward to relieve some of the angle. other option is cradle spacers.

    for your trans issue read this TCC rpm oscillation and see if it describes your symptoms
    Iíll read it on my lunch, the vibration Iím pretty sure is that, Iím going back up with it, not a fan of big drops. Cvís will be replaced as well as I have no clue how long itís been lowered.


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  11. #8 Re: Vibration. 
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    Iím done. I moved from big bear to ridgecrest to get away from the snow in March, what happens? It follows me! To the damn desert!!!! Ridiculous.




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  13. #9 Re: Vibration. 
    GTP Level Member wowitsfast's Avatar
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    At least it shouldn't last to long in the desert.

    2/3's of Oregon is high desert and it's buried in snow and ice right now

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  15. #10 Re: Vibration. 
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    Quote Originally Posted by wowitsfast View Post
    At least it shouldn't last to long in the desert.

    2/3's of Oregon is high desert and it's buried in snow and ice right now

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    My parents are up in Oregon right now at my sisters. Somewhere like 16ish hours from big bear. All I know is she is the big wig for some guitar company. They said itís freezing balls up there right now. Supposedly we are getting snow tonight as well as tomorrow. Big bear is shut down, went R3 about 1300, shut down at about 1530ish.


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  16. #11 Re: Vibration. 
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    Quote Originally Posted by mguzzo View Post
    RE; vibration - if you are significantly lowered it messes up the CV angle. do you have shortened dogbones, they move the engine forward to relieve some of the angle. other option is cradle spacers.

    for your trans issue read this TCC rpm oscillation and see if it describes your symptoms
    The vibration is more than likely the cvís. Just need to get to fixing it.

    On the tcc issue, if I lightly touch the brake pedal while accelerating, it will exit lockup and the issue goes away. Hopefully itís not rebuild time. Iíll try a trans filter and fluid change first, see if anything improves. As of right now time just isnít on my side.


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