putt4do

01 S8
Had a TB replaced about 5 mo's ago.
Wondering if something slipped.
Ive messed with VAG and manual and no luck.

Not getting any codes.


https://forums.audiworld.com/a8/msgs/161716.phtml

PaulW

You had the timing belt replaced about 5 months ago, has it run since then?

Have you cracked the fuel rail at the engine to see if there is fuel pressure?

If the fuel pump went South.....there are no codes.

putt4do

<ul><li><a href="https://forums.audiworld.com/a8/msgs/161716.phtml">https://forums.audiworld.com/a8/msgs/161716.phtml</a</li></ul>

PaulW

Have you checked to see if you are getting fuel to the fuel rail?

Always Overcharged

Try swapping output stages and see if anything changes

PaulW

So that's why I'm thinking fuel.

putt4do

output stages are part of the coils on this engine.

progiS8

You may have done this already, but have you checked the compression in the cylinders?

ricoblanco

These commonly go out on the C4's and when that happens, no spark/no start. I don't think it will grace you with a code either. If you have the Bentley, go to Section 28 under Ignition System, Servicing. There is a Camshaft Position Sensor folder there to run a simple test with a voltage test lamp and a multimeter. This part is ~$85 for the D2, not too bad compared to other fuel components. My $0.02.

PaulW

Did you check for fuel pressure?