Different sensor than the ambient temp read on the dash, that sensor is usually on the mirror. The humidity sensor is located on the intake side...
Check, the humidity sensor, It exhausts air on the actuator control and doesn't let it build boost because the vgt turbo doesn't know what kind of...
Curious what you found I have a 93 T600 (ck12868) 3406c peec that has similar symptoms, can't get it to do it at idle, but will have a slight...