[carmichael28]

Hi I recently picked up a used f30 with 146k miles, timing chain was replaced by bmw according to paperwork about 20k miles ago. There is no CEL popping up but the previous owner mentioned the drivetrain malfunction popping up, so I’m nervous to drive it in sport mode. These are the codes I was able to pull since I had the car a few days I haven’t driven it much. The intake filter was pretty dirty and seems to be running a tiny bit smoother since changing but still doesn’t sit right with me.

[rhenier99]

I would say swap your coils between cylinders, 2 to 1 and 3 to 4, and see if the codes follow, if they do, you need new coils, if they don't try the same with the sparkplugs, if that doesn't fix it, it might be injectors or worse, be careful with the sparkplugs, they're easy to break on the resistor (a swivel socket helps, but it isn't necessary, just don't overtorque).

Regarding the charge pipe pressure, make sure the charge pipe has no leaks, check for cracks in it as they're quite brittle especially at that mileage. I think a vacuum/boost/pressure leak test would be a good thing to do.

[carmichael28]

Thanks I appreciate the info. And what’s “worse”? 😂😂 I mean at this point hearing all the possibilities and timing chains bending valves, I’m bracing myself for a blown engine.

[cfm56d7b]

Originally Posted by rhenier99

I would say swap your coils between cylinders, 2 to 1 and 3 to 4, and see if the codes follow, if they do, you need new coils, if they don't try the same with the sparkplugs, if that doesn't fix it, it might be injectors or worse, be careful with the sparkplugs, they're easy to break on the resistor (a swivel socket helps, but it isn't necessary, just don't overtorque).

Regarding the charge pipe pressure, make sure the charge pipe has no leaks, check for cracks in it as they're quite brittle especially at that mileage. I think a vacuum/boost/pressure leak test would be a good thing to do.

Echoing the same recommendations.

Considering the mileage, performing a compression test in each cylinder would be a good idea.

Keep us updated!

[carmichael28]

So something funny happened today. I tried switching the coil from cylinder 2 which was misfiring, to cylinder one. The coil looked much dirtier than #1, and this is what the scanner showed after switching. Still says several misfires, but not showing cylinder 3 like it was before the swap. It said permanent then intermittent, then I swapped them back cleared everything. I’m thinking about just changing all the coils but I’m hesitant to throw money until I get it checked out by a specialist. Maybe it’s not the coils since the misfire didn’t follow the coil from cylinder 2 to 1. There’s no fuel injection switched off codes or anything either. My vacuum pump is most likely shot though due to oil in the vacuum lines and engine cover, probably my lack of power issues. It also stalled out on me this morning after a cold startup RPMs dropped it shivered and turned off. Still no CEL or DTM…only refill coolant but I’m pretty sure it’s full. https://youtube.com/shorts/NtqpfGy5T...vPpA0smhGLLBtC

[F30Nino]

hi so i have a 2013 bmw 335i with 83k miles its stage 1 and i have a bad misfire case i replaced spark plugs and coil packs multiple times and even the injectors and maf sensor but no luck in fixing it, it just misfires on start up and gives me a check engine light with these codes 140002 140010 14102 and 14110 as soon as i start to drive its like the misfire goes away and then comes back once i stop i’ve had people telling my dme might need to be repair but im hoping it doesn’t and when i unplug my maf sensor it runs a lot smoother but when i plug it in its back to rough any help please ive looked these codes up everywhere and cant find anyone with the same problem or solution to fixing it