I’ve been running premium 98 octane gas in my Zupra since day 1, and this hesitation only started about 15 months into ownership. Coincidentally, after I had the brake safety recall work done.Z4monster wrote: ↑Sat Feb 19, 2022 5:42 pm
It hasn't been back to BMW since my last visit. To be honest I was pretty annoyed with them. Their attitude was 'We can't see a computer fault so we can't diagnose the issue unless it's occurring when we have the car' Also 'Can you not bring it in when it's happening?'
Err, it's intermittent and I could be 30 miles form you when it happens. Also it could stop doing it on the way to you, so the answer is NO! I can see their point but less than great customer service IMO.
Unless it throws a dash fault then I'm basically stuck with it happening from time to time.
Interestingly, it seems to happen less with higher octane fuel onboard although that could be completely coincidental. Next month I'm back in the office again so the car will be getting more usage. Let's see if it starts occurring more frequently. If it does, BMW will be getting the car until they find the fault.
The dealers always try to replicate the fault before they proceed with repairs, but intermittent faults are a pain. What I’ve done is provided evidence like dash cam footage and the sensor reading logs from BimmerLink.
Have you considered running a BimmerLink with an OBDlink reader to observe readings when you’re driving? I also picked up the shadow HPFP codes with BimmerLink - but those were triggered by long crank start ups. The hesitation doesn’t trigger any noticeable codes, shadow or otherwise.