Oddball engine issue
I picked up a 2006 Z4 M back in May with 55k on it....definitely the best car I've owned, love the power, the steering, the suspension...all of it.
However, it's done something twice now that has me a bit spooked.
Basically, I'll be driving down the road, normal highway speed, and shift down to pass, etc, and I get a service engine light, and it starts running TERRIBLY. I mean, like no power, feels like three cylinders. Exhaust note goes punky, everything. First time it happened, I thought, oh crap, there goes my VANOS....so, I pull off the road, get out, listen to it, see if I've got disconnected plug wires, etc. Can't find anything, so I turn it of. A few minutes later, start it up, and presto, no issues at all.
Now, the first time this happened, I was at 12,000 feet on a road trip through the CO rockies....chalked it up to maybe some issue with the altitude and air/fuel mix.
But, same thing happened to me last night driving home from work...and just as before, I pulled off, turned it off, started it up, runs like a top.
I'm stumped....any thoughts?