Vibration Help

[oVer-Boostin]

Well while im cruising, the pedal and underneath me vibrates, when i hit the gas it kinda lessens a bit then when i let go it vibrates pretty bad and it bothers me. Its not the steering wheel that vibrates. I would appreciate any help.

car is a 98 GST spyder that I just picked up (no mods) just a Blitz BOV

 

[Glliw]

Hmm. Hard to tell. Might be the balance shaft bearings. Or a rough off WOT tune.

 

[oVer-Boostin]

what do you mean?

 

[oVer-Boostin]

its coming from the passenger front side. Could it be the axle or the wheel bearings?

 

[GST with PSI]

Hmm. Hard to tell. Might be the balance shaft bearings. Or a rough off WOT tune.

??Balance shaft bearings?? What?


Which pedal is vibrating? The gas, brake or clutch if you have one? Vibration could come from a number of places, but I would start with a dynamic wheel imbalance.

See this thread.

http://www.dsmtuners.com/forums/showthread.php?t=219428

Hope this helps...

 

[oVer-Boostin]

its the gas pedal...do you think its the wheel bearings? Thanks a lot.

 

[GST with PSI]

its the gas pedal...do you think its the wheel bearings? Thanks a lot.

I would rule out the front wheel bearings. Usually in most cases a bad wheel bearing would likely cause a vibration in the steering wheel. Also, wheel bearings, when bad enough, make a growling noise that increases with vehicle speed. Just to get this right the gas pedal is actually vibrating, or is the car itself vibration? I've never herd of a accelerator pedal emitting vibrations. Here are some things I would check that may cause a vehicle vibration other than tires.

Axle shaft:
A bent or worn axle shaft may cause a vibration. Typically felt in the steering wheel and car itself, a bad axle or half shaft will sometimes make a clicking or poping when driving around corners oR making sharp turns. You could lift the vehicle and observe the turning movement to try and see any run out. Check the axle shaft boots for tears and grease leaking. If the boot is torn the axle joint has likely been exposed to road dirt and moisture and is probably bad. On some axle shafts it is possible to replace just the boot if the joint is still good.

Lug nut torque:
Believe it or not a loose or over torqued lug nut could cause a vibration. loosen all of your lugs and re torque them. I like to use 100-110 ft/lbs. Whatever the spec, make sure each lug is torqued equally.

Motor mount:
A loose motor mount could cause a chunking and possibly a vibration. pop your hood and rock you motor back and fourth. Make sure all of the motor mounts are in operation. If you have an automatic vehicle move the gear selector for drive to reverse while listening for a thunk noise.

Bent rim:
Check your rims to make sure they haven't been curbed or bent by the road surface. If you can see any defects visually, they are surely throwing your wheel assembly out of balance.

Rear wheel bearing:
A rear wheel bearing causing an out of balance condition could be the problem. lift the car and put you hands on the bottom and top of the tire's tread. Pull the tire in and out feeling for movement. If you can feel any movement at all, pull off the wheel and check the wheel bearings.

There are more causes but check those first. Most vibration problems are wheel related problems. Tires and rims are almost always the cause for a vehicle vibration. \

good luck....