So my 01' a4 quattro 1.8t decides it doesn't want to start anymore.

Parts replaced so far
Battery
Spark plugs
Starter
Cam sensor

When key in the "on" position but not started you can hear the fuel pump engage and when hooked up to scanner no trouble codes are given so at this point I'm totally stumped at what to do next

Here is a video of what it sounds like

 

That doesn't sound like it's turning over at all.
Can you manually turn the crank pulley, to make sure the engine isn't seized?

 

If it is actually turning over (tach does move just a little) , sounds like theres no compression.

Just happen out of the blue, like it wouldn't start in the morning, or did it die while driving it somewhere?

 

It was running fine, then you parked it, it cooled and when you went to start it next time, it started doing this?

How long did it sit for?

Can you hear the fuel pump prime?

 

The 1.02.1999 date on the odometer tells me the battery was disconnected. OP was that you, checking on why it wouldn't start? You may have shorted a fuse of some sort; you're either not getting fuel or not getting spark. Options:

Fuel pump, fuel pressure regulator, fuel pump relay, ignition control module, crank position sensor (not likely, as from what I understand, this also determines engine speed, which would lead to no-read from the tachometer), camshaft position sensor.

We'll need more information before determining if it's fuel or spark related.

 

I have a 2001 Audi A4 Quattro 2.8. It ran fine and started fine. Then the other day it wouldn't start. Put a new starter on it. Still nothing. Relay is clicking so I know that's working. Getting power to the starter but still nothing. Could this be the clutch switch? And if so is there a way to bypass it for a temporary thing and where else can I buy one at.

 

You're not going to get any of you questions answered by posting in here, because you're thread-jacking the OP. Essentially: No one knows you're asking anyone for anything. You need to start your own thread so people will actually see you/your issues and questions.

Just an FYI

 

Mine is doing the same thing! While I was driving it turned off and won't start again.... did you figure this out? I really need help on this one. Msg me please
(2000 A4 1.8T Quattro)

 

Unfortunately this thread died 7 months ago w/o any conclusion or update from the OP.