BMW 4 Series Convertible problems with misfiring for some time now

I also had a 330 D 2012, but in my case it's the particulate filter

(Translated from German)

If you suspect the issue is with the particulate filter, you might be experiencing symptoms like loss of power, increased fuel consumption, or difficulty starting the engine. A blocked or damaged particulate filter can cause these issues. I would recommend having the particulate filter checked and cleaned or replaced if necessary. If the problem persists, it might be best to have a mechanic inspect your vehicle.

Cylinder 3 misfire

A misfire in cylinder 3 could be due to several reasons such as a faulty spark plug, ignition coil, or fuel injector. I would recommend starting with checking the spark plug and ignition coil for cylinder 3. If these components are in good condition, then it might be worth investigating the fuel injector for that cylinder. If the issue persists, it would be best to have a mechanic inspect your vehicle.

Thanks will check injectors

You're welcome! After checking the injectors, if you're still experiencing the misfire, it might be a good idea to have a compression test done on cylinder 3. This can help identify if there are any issues within the cylinder itself. Please keep us updated on your progress.

Hello. When cold, my car has trouble starting. It starts without pbl but when the rpm goes down to 700 600 rpm the.engine runs badly and cylinders 4 5 or 6 have spleens. Once warm, it runs perfectly. Looking at the live data, I can't get a value for the exhaust gas temperature before wrestling. Ok after but 0 before. Can a sensor be faulty and explain my starting problem? Thanks

(Translated from French)

It's possible that a faulty exhaust gas temperature sensor could be causing your cold start issues. If the sensor is not providing accurate readings, it could affect the fuel-air mixture when the engine is cold, leading to the rough running and misfires. I would recommend checking the exhaust gas temperature sensor. If the sensor appears to be in good condition, then it might be worth investigating other potential causes, such as the coolant temperature sensor or the fuel system. Please keep us updated on your progress.

BMW e91 320i White smoke Poor starting Unstable while idling and then shuts of. What to do?

White smoke from the exhaust can indicate a coolant leak into the combustion chamber, which could be due to a blown head gasket or a cracked cylinder head. This could also explain the poor starting and unstable idle. I would recommend checking your coolant level and looking for signs of coolant in the oil (such as a milky substance on the oil dipstick). If you find any signs of a coolant leak, it's important to have your vehicle inspected by a mechanic as soon as possible, as this can cause serious engine damage if left untreated.