Rough idle - will not run

[rob76turbo]

Did some work on a 2006 Cayenne Turbo. Part of the process is I removed the intake / fuel rail and cleaned them. When I put everything back together, all the connections for at the front of the engine and started it - it runs very rough, sounds like it is backfiring, if it does idle its very low RPM and when I press the throttle, nothing happens. 

 

I bought and installed a new Throttle Body (I dropped the first one during cleaning so I figured it could have been that). But with a new throttle body, it runs even worse. Did the Throttle body adjustment turning it one, waiting a minute while it calibrates (it does). I cannot tell if it is getting enough fuel or air. There is pressure on both sides of the fuel rail. Must admit, running out of ideas. Anyone have any ideas or questions that will help identify the issue?

 

Also it is not throwing any codes, but may not be able to run long enough to generate them. 

 

Thanks in advance!!!

[Loren]

Check for air leaks around the intake and fuel rail. That is the most common issue with idle - a smoke machine would be beneficial.

 

[DelaveagaSC]

Ran into a similar issue once on a cayenne. It was contributed to one of the cam

position sensors being unplugged, no throttle performance and intake backfiring. Double check any connector you may have touched or accidentally hit. Good luck!