Butter
Persistent Cylinder 4 Misfire in BMW 5 Series - Injector Replacement Ineffective
Loss of engine power
Check engine light on
Shaking while idling
3 comment(s)
@CarlyMechanic
Start by checking the ignition coil and spark plug for cylinder 4, as these are common causes of misfires. If they are faulty, replacing them might resolve the issue. Let me know how it goes or if you have any further questions.
Sparks and coils were replaced at the same time. Checked the spark plugs and they looked to be operating just like the others I checked. Its weird, when I start the car there’s no driving malfunction but after a while driving in city due to a lot of stops, it pops up usually in 2-3 gear driving manual (automatic transmission). On the highway always 5 gear once I downshift. It’s really like a off and on thing.
@Butter
Sparks and coils were replaced at the same time. Checked the spark plugs and they looked to be operating just like the others I checked. Its weird, when I start the car there’s no driving malfunction but after a while driving in city due to a lot of stops, it pops up usually in 2-3 gear driving manual (automatic transmission). On the highway always 5 gear once I downshift. It’s really like a off and on thing.
Inspect the wiring and connectors for cylinder 4's injector and ignition coil to ensure there are no loose connections or damaged wires. Electrical issues can cause intermittent misfires. If the problem persists, it might be worth checking for vacuum leaks or performing a compression test. Keep me updated on your findings or if you have more questions.
Start by checking the ignition coil and spark plug for cylinder 4, as these are common causes of misfires. If they are faulty, replacing them might resolve the issue. Let me know how it goes or if you have any further questions.