GT86 Jerking Acceleration Boost Sensor

That sounds eerily familiar! I had almost the exact same symptoms with my GT86. Jerky acceleration, weird noises, the whole shebang. Did you check the sensor itself for any physical damage? How about the surrounding hoses – any cracks or obvious leaks? Because even a small crack in the line could cause a boost leak that throws everything off. And what about the wiring harness? Is it properly seated? Is there corrosion?

Thanks for the quick reply! Hmm, I only gave the sensor a quick glance, to be honest. I didn't see anything obvious, but I wasn't really looking for anything specific. As for the hoses, I visually inspected them, but I didn't really do a thorough check. What should I be looking for exactly? And how would corrosion in the wiring harness cause these issues?

Alright, so, hairline cracks in the hoses can be tricky to spot, but even those can cause enough of a boost leak to trigger those symptoms. As for the wiring harness, corrosion can mess with the signal the sensor sends to the ECU, leading to all sorts of weirdness. Given all the symptoms you're experiencing, and the fact you've already checked the basics, it really does sound like a faulty boost pressure sensor or a boost leak somewhere in the system. I'd suggest taking it to a trusted workshop. It could be a simple fix, but it's better to have a professional diagnose it properly before something bigger goes wrong.

Thanks a million for the advice! I took it to the shop today. Turns out it was the boost pressure sensor – specifically, the cable connection was defective, just like I initially suspected! New sensor and fitting the new sensor costs 95€. Glad it wasn't anything more serious!