One or two cylinders not working in the morning
As in the title, early in the morning, after just starting the engine, one or two cylinders are not working. I say not working because the idle is rough. After the engine warms up a little (towards the end of the blue zone on the gauge), it smoothes out. The temperatures during the night is about -20C, in the morning about -15, -16C.
What might be the culprit? I changed the sparks about two weeks ago to Beru Ultra. Beru website says these are exactly for my BMW.
Yeah, i feel like 1 or 2 cylinder isn't working when i get up
sometimes in the morning.. a couple of pepsi's usually takes care of that though.. In your case it could be the hydraulic valve adjusters not pumping up because the oil is too thick when cold. Switching to a 0w40 synthetic mobil one should help that if thats the case. If that is the case the valves will be tapping louder until it warms up also.. Otherwise on some cars it seems like the injectors are plugged up or stuck until the engine runs for a few minutes too. Running a couple of cans of good injector cleaner through should help if thats the case. It can also be vacum leaks at the intake manifold or somewhere in line from the mass air flow sensor to the engine. To test that you'd need to spray some throttle body cleaner around all the areas that it could leak such as manifold gaskets throttle body gaskets, vacum hoses etc with the engine running and cold when its missing, if it suddenly picks up the cylinder after you spray an area then you know where its at.
Quote:
Originally Posted by t_marat
As in the title, early in the morning, after just starting the engine, one or two cylinders are not working. I say not working because the idle is rough. After the engine warms up a little (towards the end of the blue zone on the gauge), it smoothes out. The temperatures during the night is about -20C, in the morning about -15, -16C.
What might be the culprit? I changed the sparks about two weeks ago to Beru Ultra. Beru website says these are exactly for my BMW.