Rocky Mountain Club B5

Discussion Forums => Maintenance => Topic started by: Usermanual on June 16, 2006, 01:47:15 PM

Title: Strange Vibration from the Accelerator Pedal
Post by: Usermanual on June 16, 2006, 01:47:15 PM
I am looking for help diagnosing a strange vibration coming from my accelerator pedal. As I am driving at higher speeds 40+ I get a strange vibration that I can feel only through the accelerator pedal. No other area of the car shakes or vibrates, there is only this vibration. I can best describe the vibration as if there was  a flat spot on one of the tires only the vibration is of a faster pace / frequency than a single tire revolution.

I am thinking wheel bearing, however, I would associate that with a grind when turning my steering wheel. Is there any other place I should start looking? How common is this with other A4's? I have a 99.5 A4 Tiptronic.

Thank you,

Jon
Title: Re: Strange Vibration from the Accelerator Pedal
Post by: 03Indigo on June 16, 2006, 02:09:33 PM
what about warped rotors?  That could cause several pulses per rotation.

Just a thought.
Title: Re: Strange Vibration from the Accelerator Pedal
Post by: Usermanual on June 16, 2006, 02:21:21 PM
There is no increase in vibration as I apply brake...does that rule out rotors?
Title: Re: Strange Vibration from the Accelerator Pedal
Post by: 92UrS4 on June 16, 2006, 02:26:38 PM
Well if it is the pedal I would wonder if it is the engine mount or a transmission mount or something like that.
Title: Re: Strange Vibration from the Accelerator Pedal
Post by: 03Indigo on June 16, 2006, 02:27:14 PM
no, vibration can go away when you apply the brakes, since the caliper is adding pressure to the rotor.  I think it depends on the condition of the brakes, some experience it differently...increase vibration when brakes applied, or vibration goes away when brakes applied.

The questions I have are:
1. does the vibration change frequency with speed....ie: the faster you go, does the vibration increase?

2.when turning at speed, is there a change in the intensity or frequency of vibration?...like going around a curvy road while the vibration is occuring?



Other possibilities are tire balance, alignment, tire rod ends, control arms, or something like you suggested...wheel bearings or CV joints.  I would expect that you might feel most of those through the steering wheel before the gas pedal, but you never know.
Title: Re: Strange Vibration from the Accelerator Pedal
Post by: scott on June 16, 2006, 10:12:49 PM
Is your fast stuck under there? You might check and make sure you did not squish him...