its an 08 e90 6mt that i cant seem to shake this ongoing issue of limp mode check engine lights and eating spark plugs. so this is what ive compiled from owning this for a year and chasing this ongoing gremlin in it. The car at 8000 rpms (when it was running fine no issues going on) would lean out cylinder 5 then crunch the diodes on the spark plug together into the center of the plug. Then cylinders 6 & 7 were black and wet on the plugs when i pulled spark plugs. Bank 1 plugs all look great consistent color no problems. I get misfire codes only for cylinders 5-8 sometimes a cylinder on bank 2 would come up on the scan but i think once it misfires on so many cylinders on the other bank its just domino effect. Im basing more of this on what ive actually found by pulling plugs. The car is consistently going into limp mode now after 10 minutes after each start up. I can shut the car off and drive it again for another 10 minutes with no issues runs fine before it goes into limp mode. Seems like when it goes into limp mode it will run rough for about a minute and then evens itself out and seems to run on all cylinders again still in limp mode. The car is stock stock other than a cut out exhaust kit installed right before the tail muffler box. Ive replaced a bank 2 o2 sensor pre cat and a fuel pressure sensor on the firewall trying to chase this. The thing that doesnt make sense to me is I only get misfire codes nothing for throttle actuator codes or injector codes which is more the way im leaning. Ive had a couple bmw mastertechs scratching their heads. Any insite id love to get this thing running smooth and consistent without the worry of my car going into limp mode or eating a spark plug every time a corvette pulls up revving. Im happy to answer more questions and details to help aide in opinions. Im lost and loosing "the fun factor" of this car after the bmw oil and gas tax with the headaches and down time with it. Hook me up guys this car needs to get back on the road!
