FJCruiser Jerking Whistling Noise

Based on your description, a defective cable or plug connection to the boost pressure sensor is a plausible cause. The symptoms you described, such as jerking, whistling/hissing, stalling, increased fuel consumption, and reduced power, align with potential issues arising from a faulty boost pressure sensor affecting the turbo system. May I inquire if you have access to an OBD-II scanner to read the error code? Knowing the precise code will help confirm the diagnosis.

Thanks for the quick reply! Yes, I do have an OBD-II scanner. It's throwing a code P0238, which indicates a 'Turbocharger Boost Sensor A Circuit High' input. Does that solidify the boost pressure sensor as the culprit, or could there be something else at play? I had a similar issue with my old Tacoma and it turned out to be a vacuum leak, but the symptoms weren't quite the same.

The P0238 code indeed strongly suggests a problem within the boost pressure sensor circuit. Given that you've already identified a potentially defective cable or plug connection, it's highly probable that this is the root cause. While other factors can contribute to similar symptoms, the combination of the code and your visual inspection points towards the sensor or its wiring. To avoid potential misdiagnosis, I suggest a visit to a workshop, it would be best.

Thanks a bunch for your insights! I really appreciate it. Turns out you were spot on. Took it to my local mechanic, and it was indeed a faulty connection on the boost pressure sensor. They replaced the connector and rewired a small section. Total cost was 95€. Runs like a champ now!