This condition may be caused by major carbon build-up on the intake and/or exhaust valves due to SI diagnosis may or may not isolate the cause of the misfire depending on whether the intake / exhaust valves are sticking at the time of the diagnosis.Car alert says issue with emissions system has been detected. 2016 chevy sonic misfire, Get the latest in-depth reviews, ratings, pricing and more for the 2016 Chevrolet Sonic from Consumer Reports.
