Audi 1.9TDI 'clicking' from under bonnet before starting

[Spathodus77]

Hi all,

When I switch on the ignition for my 1.9TDI Audi 80 I get a click-click-click from under the bonnet until I start the engine. Once I start the engine there is too much noise to tell if the clicking is still occurring. The suspect component has three vacuum lines coming from it. See three pics of the part below. The vac lines go to the following locations
The first (black) vac line goes to the air inlet.
The second (green) vac line goes to a component alongside the turbo (waste gate?) - see fourth pic below.
The third (red) vac line disappears into the exhaust manifold - I don't know where it actually terminates.

The car starts and drives fine, but is the clicking normal? what is the purpose of the component with the three vac lines?

Thanks for your help,

Ralph

Pic 1: Component with 3 vac lines close up:


Pic 2: Component with 3 vac lines zoomed out:


Pic 3: Component with 3 vac lines zoomed out further:


Pic 4: Termination point for green vac line - a wastegate?

[Defcon5]

Fuel pump?

[Spathodus77]

Thanks for the suggestion. I did a bit more investigating today. It is definitely the solenoid pictured in the photos and I'm 95% certain that it stops when I start the car.

Ralph.

[BoraBora]

have you gave the fuel stop solenoid a clean out ?

[Spathodus77]

Hi, thanks for the suggestion, where is the fuel stop solenoid and how do I clean it?

Is the part that clicks the boost pressure control solenoid?

Thanks,

Ralph.

[BoraBora]

if its a transverse engine its just after the fuel pump, you can get it off with a shifter.


on second thoughts if its a constant clicking and your engine starts its unlikely to be that..