this is odd.. my car have this one weird vibration.. only above 60mph, and only when i let go the gas pedal completely and let the car roll, then it will start to shake violently.. once i tap on the gas, its fine.. anyone know wats going on?

 

uneven tirewear?

 

If you drive above 60 eventually will vibration go away? If so I would say tire balance. If you cannot drive beyond the vibration I am thinking alignment.

 

where do you feel the vibration? steering wheel? seats/body?

thinking worn inner/outer tie rods, or ball joints.

 

Man same here... Still searching for an answer. Did you manage to fix yours yet?

 

sounds like driveshaft imbalance? hows the trans mount looking. you can take the driveshaft loose and turn it 180 and try that. or do the hose clamp method to counterweight it but thats a guessing game too.

 

^^^^^^I have the same problem, i believe this might be the answer. I was thinking along these same lines^^^^^^^^^^^^^^^

 

i mean unless its an obvious tire balance issue. which would be easier to do anyways......wouldn't hurt unless you've recently had tires put on or balanced? these cars dont normally have driveline vibration issues.......

 

If I had this issue I'd find an independent brake/alignment shop that deals with suspensions. Explain what you're feeling to them, get it on a rack and find out what's lose or warn that would cause this vibration. It's better to find someone that knows suspensions than to keep going back to the dealer where they don't have a clue what your talking about.... I had a simular vibration and discovered my idler arm was sloppy/worn out on a previous car. Only was to tell is to get er up on a rack.
Gary

 

do you know if anyone has dumped an entire bottle of TIRE FIX, you know the gooey liquid that rolls around in your tire forever?

 

i believe there was a TSB on the automatic transmissions having a shudder problem at 40... not sure about 60mph... could something be loose in the drivetrain (i.e. rear end, driveshaft, tranny) that causes vibration until pressure (hitting the gas pedal) is applied?

 

For the love of god, do not use that crap, or Fix-a-flat. 99% of the time it doesn't work, and then when you take it to your local tire shop they are going to HATE you (and probably charge you extra) when they have to scrape the sh*t out of your tire to fix the actual puncture. I used to work for one of the largest wheel/tire resellers in the US.. stay away.. far far away from those products.

 

i believe the ITB08-017 'Throttle Sensitivity' update takes care of this shudder. My 07g35x has this and it really pisses me off. Seems like the only fix is to sacrifice your off the line pep for ride comfort. I notice this becuase I drive in traffic every night on the way home. Do you also have the little 'blip' in rpms around 2750rpms when you put it in Manual mode in 2nd and 3rd gears? BTW There is a whole thread on this where one member successfully fixed this shudder: https://g35driver.com/forums/g35-sed...-60km-h-2.html