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Billy
Billy, Trainer/ Master Technician
Category: Audi
Satisfied Customers: 3498
Experience:  Trainer 8+ years, master tech. 10+ years, SAE member
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Audi A4 Quattro: on a 2003 Audi A4 3.0l Quattro I have a rapid

This answer was rated:

on a 2003 Audi A4 3.0l Quattro I have a rapid clicking under the dash under acceleration. Sounds like a relay and seems to be coming from the same area on the drivers side where the fuses and relays are located. Also, while in tip mode, if I down shift and the engine revs up slightly, the same noise is present but is much fainter and almost unnoticeable. The noise is not present while reving the engine in park or neutral or at least is not loud enough to hear.

Billy :

Hello and Welcome! I'm Billy and i will assist you with your inquiry. Feel free to ask if any further info is needed.

Billy :

First you need to remove the trim panel under the dashboard, over the footwell, to gain access to the relay plate.

Billy :

Having done that, make sure that the fuse and relay plates are securely and firmly fixed on the dashboard (on the bracket).

Billy :

And if that is the case, you need to check the relays, make sure all are tightly and firmly seated.

Billy :

Having done that, and if the problem persists, then you need to drive the vehicle with the trim cover removed, and have someon touch the relays one by one, to figure out which one is causing the clicking, and then replace as necessary.

Billy :

Before replacing, you can remove, spray some contact cleaner, and refit.

Billy :

Thank you for your trust! Get back to me if you need more info...Thank you in advance for the positive rating...
http://www.justanswer.com/car/expert-billy/

Billy :

Regards, Billy

Customer:

Thanks for the response. That sounds like a plan. I have a few questions though. When I first bought the car I noticed some vacuum lines/fittings that were cracked in the engine compartment and thought that this may have been part of the problem and was causing the vacuum pump relay to "chatter" when the engine was under load as it continues to drop vacuum. Is it possible that I still may have some lines that are leaking causing this issue? I did check to make sure I put all check valves back in the proper way and lines are connected. What should the proper vacuum be in this system in inHg? I know it should fluctuate but at an idle and WOT what should I be seeing. Thanks for the help.

Billy :

Hello,

Billy :

It is always possible to have vacuum lines causing this, so these need double checking.

Billy :

The vacuum in the intake manifold on a non turbo engine varies between 0.2 bar (around 150 mm Hg) at idle and increases till around 0.9 bar (675 mm Hg) at WOT.

Billy :

Regards, Billy

Billy and 2 other Audi Specialists are ready to help you
Hello Eric!

Hope all is well...

Just checking if your clicking noise issue was sorted. Get back to me whenever you need additional assistance or technical details.

Regards,
Billy