i8 Timing Issues Causing Power Loss and Engine Noise

Hey there! I actually had a similar issue with my 2017 BMW i3s Hybrid last month. The symptoms you're describing sound exactly like what I experienced, power loss, rough cold starts, and that unmistakable valve train noise that makes you cringe. Turned out my crankshaft position sensor was failing. The main symptoms were sporadic power delivery and that awful ticking noise from the engine bay. The sensor wasn't reading the crankshaft position correctly, which threw off the engine timing and caused those problems you're mentioning. It was quite a serious issue that needed immediate attention, running the engine with incorrect timing can cause major damage if left unchecked. The repair involved replacing the sensor and recalibrating the engine management system. Had it fixed at a certified shop since these hybrids need specialized diagnostic tools. If you're not comfortable with your current mechanic, I'd strongly suggest finding a certified BMW specialist who regularly works on hybrids. Better safe than sorry with these high-tech powertrains.

Hey, thanks for sharing your experience! You described the exact same symptoms I had. When my i8 had those issues, the crankshaft position sensor replacement sorted everything out. Really appreciate the detailed explanation. Just curious, do you remember roughly how much you ended up paying for the fix? Also, has everything been running smoothly since the repair? I want to make sure I'm prepared for what's ahead, especially since these hybrid systems can be quite complex.

Hey again! Glad I could help with the sensor issue insight. Yeah, I got it all sorted at a certified shop and it set me back 340 € for the crankshaft sensor replacement. Since getting it fixed, my i3s has been running like a dream, no more weird noises or power issues. The mechanic showed me that the Crankshaft to camshaft reference value was way off before the fix, but now it's spot on. These hybrid systems can be tricky, but once you get the right diagnosis and fix, they're pretty reliable. Haven't had a single problem since the repair, and it's been about a month now. Cold starts are smooth again, and the power delivery is back to normal. Trust me, it was worth every penny to get it properly sorted by someone who knows these systems inside out. Just make sure whoever works on yours uses the right diagnostic equipment, that's really key with these high-tech engines. The sensor might seem like a small part, but it makes a huge difference in how the whole system runs.

Thanks for all that info! Finally got my i8 sorted today, and you were absolutely right about everything. Found a certified mechanic who knew exactly what they were doing. The bill came to a bit more than yours, guess that's the i8 tax for you! But honestly, it was worth it. The repair went smoother than expected. My previous mechanic had me worried for nothing. The new guy spotted the issue right away, replaced the sensor, and did a full system calibration. Now my car's running better than it has in months, no more scary noises or power problems. Can't believe I waited so long to get this fixed. Should've asked here sooner! Really appreciate you sharing your experience, helped me feel more confident about getting it sorted. Time to enjoy my car again without worrying about every little noise!