2004 BMW 745Li VIN: WBAGN63464DS48525
274E - DME: misfire detection, cumulative error
2749 - DME: misfire detection, cylinder 2
Vehicle came in misfiring on cylinder #2. I initially replaced the spark plug and ignition coil on that cylinder. Misfire didn't go away so I did a compression test, which showed normal compression. With the vehicle idling I tapped the fuel injector for the #2 cylinder and the engine
cleared up and ran smoothly. I then replaced the fuel injector. The vehicle is running better but still misfires on the #2 cylinder on cold starts, but runs and drives smoothly once the engine warms up. It also runs smoothly on warm restarts.
Just misfires on cold starts?
(I've also replaced the crankcase vent valves, checked for vacuum leaks (didn't find any), filled the tank up with premium and some fuel additives, and reset the engine adaptations...)