The timing must be off. There is a crank lock that must be installed when changing the belt and also a holding "jig" that holds the cams in place while you are changing the belts. Also the cam pulleys must be separated and free from the cam shafts when installing the belt and tensioning in order for the engine to be timed correctly.
SOURCE: 03 audi a4 timing belt replacment instructions
Get a service manual and/or check here--
http://www.audizine.com/forum/showthread.php?t=189107
SOURCE: 97 audi a4 no power/battery fuse?
Sounds like either the battery leads are on the wrong way round, or the starter main cable is touching something and shorting to earth. Retrace your steps and check your connection locations.
Either that or its a dead short through the starter. Remove main cable from back of starter and tape up incase of short. then reconnect battery. If ok now then your looking at starter motor.
TL
SOURCE: temp guage not working
It's most likely one of two things: 1) coolant temp sensor (meaning the gauge isn't working), or 2) stuck thermostat (meaning the gauge is working but the coolant isn't getting hot)
Start with the coolant temp sensor - it's on the back of the engine, somewhat near the top, toward the passenger side. On your car it's likely a blue sensor body (as is the CTS on my 99 A4 2.8). The easiest way to get to it is to remove the tube leading from the airbox to the throttle body. Take that off, and you can look down and see that there's a squarish plug with four wires plugged into the top of the coolant temp sensor (at the right angle you can see the color of the sensor - black, blue, or light green, but most likely blue on your car). There's a C-shaped retaining clip that holds the connector onto the sensor which must be pulled off (pull more or less straight back toward the firewall), and then the sensor can be unplugged. The sensor itself is just pressed into the opening in the block, not screwed in - you just have to pull upward to get it out (it can be tough - try opening the cap on the coolant tank to alleviate pressure in the system). The sensor is not expensive (around $25 from www.ecstuning.com - call them up with your VIN number to guarantee they send you the right sensor).
If you change that out, and it doesn't fix the problem, don't sweat it - it means your temp sensor was working, but replacing it was a good idea anyhow since they're prone to failure and can cause all kinds of wacky problems when they go. Next most likely problem is a thermostat stuck partially or fully open, and this is more invasive - it requires removing the front bumper, opening up the core support (with radiator and AC condensor), losing (and having to flush and refill) your coolant, and the removal of the serpentine belt and fans. It sounds horrifying but it's pretty easy actually.
I'd suggest starting with the CTS and see if it fixes the problem. If it does not, reply here and let me know and I can help you through the thermostat replacement if you're mechanically inclined and have the tools. If you're in the northeast, I can do either repair for you (I'm in the southern tier of NY) and save you a bundle over a dealership, and save you the aggravation of doing it yourself if you're not mechanical or don't have the tools or experience.
SOURCE: diagram of alternator belt on audi a4 v6 2.5d
D1 w/out AC----------------------------------------------D2 w/ AC
SOURCE: serpentine belt diagram for 1996 audi a4 quattro
Ribbed Belt: Service and Repair
Ribbed Belt, Removing and Installing
Ribbed belt, removing and installing
CAUTION: Mark the direction of belt travel before removing, using a crayon or marker. Reinstalling a used belt in the opposite direction
could damage the belt
Note: There are two different types of ribbed belt, identified as versions A and B.
Ribbed belt versions, identifying, refer to Application and ID
Removing
Old version A
- Remove ribbed belt guard.
- Loosen ribbed belt tensioner using 15 mm wrench and drift 3204.
- Remove ribbed belt.
New version B
- Using 10 mm hex socket wrench, turn downward in direction of arrow to loosen ribbed belt.
Installing
Install in reverse order of removal, noting the following:
- Place ribbed belt over drive pulleys and idler roller first, and onto tensioning roller last.
- Remove drift 3204.
- Install ribbed belt guard.
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