Hi My Son has a 2008 A4 B7 2.0d (S-Line) and we are experiencing problems with water "dripping" down the electrical cable and into the "potentiometer" (the electric circuit on the side of the throttle body itself). We have had the top cover off of the housing that hold the ECU and its all dry inside and we have lifted, by undoing the 3 nut, the rest of the housing [NOTE you cannot remove the main part of the housing without removing the wiper mechanism and other parts] AND ALSO the drain for the bulk head which houses the battery is completely clear of water. The cover plate on the potentiometer give a good seal, the water gets in via the plug/connector  

Any suggestions of how to cure 

 

 

 

 

 

 

Martin.

To my way of thinking the real problem is to stop water getting on to the throttle body in the first place, not to waterproof it. There is normally no free water under the bonnet, so where is it coming in?

Hi Thanks for the reply, that is the issue!.... You do get a little bit of water coming in to the bulkhead that is why there is a drain off in the bulkhead well, and the rubber bung clogs with "silt"

We are well aware of this issue and that is check regularly in case the water builds up. I do not know where the water is coming from to run/drip down the loom. I was hoping that someone on here has had the same/ similar problem and knows a cure.

Thanks Martin  

OK, you have eliminated the scuttle drains. What about leaks from the wind screen washer pipes/motor/reservoir? Are the soft rubber seals around the bonnet crushed and letting in rain? Is the coolant spraying from a defective reservoir cap or overflow pipe? Is the heater/aircon chamber draining properly? (Condensate needs a way out.)

4 hours ago, Martin Johnson said:

Hi My Son has a 2008 A4 B7 2.0d (S-Line) and we are experiencing problems with water "dripping" down the electrical cable and into the "potentiometer" (the electric circuit on the side of the throttle body itself). We have had the top cover off of the housing that hold the ECU and its all dry inside and we have lifted, by undoing the 3 nut, the rest of the housing [NOTE you cannot remove the main part of the housing without removing the wiper mechanism and other parts] AND ALSO the drain for the bulk head which houses the battery is completely clear of water. The cover plate on the potentiometer give a good seal, the water gets in via the plug/connector  

Any suggestions of how to cure 

 

 

 

 

 

 

Hi finest cure is a generous coating of a quality silicone grease about six quid for a large pot, push it in to where the wiring goes in to the plug then tye wrap an old bank coin bag over the grease, it won't leak again.

Steve.

Hi Thanks for the reply, that is the issue!.... You do get a little bit of water coming in to the bulkhead that is why there is a drain off in the bulkhead well, and the rubber bung clogs with "silt"

We are well aware of this issue and that is check regularly in case the water builds up. I do not know where the water is coming from to run/drip down the loom. I was hoping that someone on here has had the same/ similar problem and knows a cure.

Thanks Martin  

Hi

Thanks Steve, I have a tub of Silicon Grease, I'm gonna give it a try. Its not a great deal of water getting in, its just that it drips down the cable and into the Potentiometer causing a fault code to be thrown up AND as we cannot identify where its coming from this sounds like the best solution