Boost Issue

[Fstrnyou]

Pu Manchu was likely suggesting a leak between turbo and TB because of fuel trims changing to -15

Escaping air in a pressure zone would normally make the engine run rich. It's clear the ECU is pulling fuel to correct the richness.

At WOT, the leak could be much much worse, which coukd lead to low boost readings.

[Sensei]

Originally Posted by Fstrnyou Pu Manchu was likely suggesting a leak between turbo and TB because of fuel trims changing to -15 Escaping air in a pressure zone would normally make the engine run rich. It's clear the ECU is pulling fuel to correct the richness. At WOT, the leak could be much much worse, which coukd lead to low boost readings.

The ECU is pulling fuel at cruise however the AFR at WOT is good for all the data logs. At this point I'm pretty confident the issue is with the BCS or vacuum lines to the BCS. Other possibilities would be the PCM not sending the proper signal to the BCS (hope not $$$). Maybe a bad turbo but I think that is less likely. Once the silicone lines come in and the heat lets up I'll be getting to work on it.