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BMW 4 Series Convertible problems with misfiring for some time now

Hello everyone, I have a problem with my BMW 4 Series (built in 2017, gasoline engine). For some time now, it has been showing the following symptoms: black smoke from the exhaust when accelerating, check engine light on, loss of power, unsteady engine, jerking when accelerating, starting problems, high fuel consumption, stalling at idle and shaking at idle. I suspect it could be due to defective ignition coils or misfiring. Has anyone had similar experiences? How did the workshop fix this? I would appreciate any tips and your experiences. Thank you!

(Translated from German)

95 comment(s)

Quotation:
@CarlyMechanic wrote on
It's good that you're checking for a vacuum leak, as this could indeed cause misfires. Other potential causes could be a faulty fuel pump, a clogged fuel filter, or issues with the engine control unit (ECU). It's also possible that there's a mechanical issue with the engine itself, such as a worn camshaft or timing chain. If the smoke test doesn't reveal any vacuum leaks, I would recommend having these components checked next. Please keep us updated on your progress.

P.S. The timing chain was recently changed and also changed the pistons and everything that comes with it… so I doubt that the issue is with the engine itself.

Hello everyone, I have replaced the chain incl. valve stem gaskets, everything fitted, timing checked several times, now I have a misfire on cylinder 4 and Vanos Enlass is stuck, what could it be? Thanks in advance It is a BMW 116i from 2012 N13 engine with 135000km

(Translated from German)

Quotation:
@Auto1 wrote on
Hello everyone, I have replaced the chain incl. valve stem gaskets, everything fitted, timing checked several times, now I have a misfire on cylinder 4 and Vanos Enlass is stuck, what could it be? Thanks in advance It is a BMW 116i from 2012 N13 engine with 135000km

A misfire on cylinder 4 could be due to a few reasons such as a faulty spark plug, ignition coil, or fuel injector. Since you mentioned that the VANOS intake is stuck, it could also be related to the VANOS system. The VANOS system is responsible for adjusting the timing of the valves, and if it's not working properly, it can cause misfires. I would recommend checking the VANOS solenoids and the related wiring. If these components are in good condition, then it might be worth investigating the fuel injector for that cylinder. Please keep us updated on your progress.

Hello, my engine is misfiring cylinder 5. Is it coils or spark plugs or injectors? From where I can count cylinders number 5 ? Is from front to back?

Quotation:
@Deep24 wrote on
Hello, my engine is misfiring cylinder 5. Is it coils or spark plugs or injectors? From where I can count cylinders number 5 ? Is from front to back?

A misfire in cylinder 5 could be due to faulty spark plugs, ignition coils, or fuel injectors. It's hard to say without further inspection. I would recommend starting with the easiest checks first, such as inspecting the condition of your spark plugs and ignition coils. If these appear to be in good condition, then it might be worth investigating the fuel injector for that cylinder. As for the cylinder numbering, it can vary depending on the make and model of the vehicle. For many BMWs, cylinder 1 is at the front of the engine (closest to the belts) and the cylinders are numbered sequentially from front to back. However, I would recommend checking your vehicle's specific service manual to be sure. Please keep us updated on your progress.

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