I just bought an diagnostic fault code reader (Vgate VS-890) to try and understand why my car doesn't always run right. The car is a '07 vRS TDi, with a stutter.  

Interestingly, the display showed that the throttle position is at 95.7% most of the time, even at idle. Revving the car sees the reading drop with more revs - weird. Doesn't the high reading mean it is full open?

Took the car on a drive and the throttle position reading was doing strange things but did for a time revert to lower %age readings at low revs and higher %age readings at higher revs, as you would expect (?). It then went back to displaying 95.7% at idle. Once I switched the car off there was high pitched noise (whirring) coming from the EGR and throttle body, like the electric motors were struggling to work. Unplugging both stopped the noise.

 

What's going on? is my throttle body/EGR stuck on open? (they were both cleaned a few thousand miles ago)

 

Thanks.

#bump#

Hi Folks, hoping to get some help on this one.

Thanks