[Biturbos4] Throttle position sensor problem

Grant Lenahan glenahan at vfemail.net
Sun Oct 26 11:18:18 PDT 2008

The annoying part s that Audi wanted $1000 to replace a part. I  
called to tell them that it was un-necssary and they refused to even  
log my suggestion.  Apparently it would cut into a profitable parts  

harumph. Hope yours is fixed as easily as mine was.

On Oct 26, 2008, at 1:24 PM, Richard van der Hoff wrote:

> Hi guys, and thanks for the suggestions.
> The symptoms are exactly as you describe, Grant.
> Brett Dikeman wrote:
>> On Oct 26, 2008, at 11:17 AM, Grant Lenahan wrote:
>>> 1. clean with carb cleaner by spraying inside the TB
>>> 2. loosen/clean the TB inside by exercising the butterfly completely
>>> through its angle of motion, several times, quickly. This creates a
>>> wiping action.
>> 1.Make sure to use throttle/carb cleaner, not brake cleaner, which  
>> could destroy plastic bits and does not contain any lubricants.
> Noted. I have to say, I've had the TB off and wiggled it about  
> plenty, and it looked fine and in no way gunked up. Also I don't  
> think my problem is never driving it at WOT (for better or for  
> worse...). Still, it sounds plausible (especially after 170k miles)  
> so I'll get hold of some carb cleaner and try as you suggest.
>> 2.If you can get to the potentiometer, hit it with Caig's MoveIT  
>> moving contact cleaner.  If it is an enclosed potentiometer,  
>> really get it covered- some will work its way in to the contacts.   
>> Actuate it a bunch of times, then use compressed air to blow it  
>> clean, repeat once or twice.  As long as the tracks are just  
>> dirty, it should work great afterwards. If they're damaged,  
>> well...then you're kinda screwed, unless you can find a very close  
>> replacement for the pot.
> The pot does come apart and the tracks look fine. I've tried  
> "normal" contact cleaner on them...
> Do you have a link for MoveIT? I couldn't find it anywhere,  
> including on Caig's website. Do you mean DeoxIT?
>> Since gunk will affect the resting position of the throttle, it  
>> may be beneficial to re-calibrate the throttle?
> Tried that already :/.
> Thanks again,
> Richard

Grant Lenahan
glenahan at vfemail.net
(201) 602-4702 mobile

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