[joro2077]

Few days ago I noticed rough idle at cold start and after it warm up it was fine. Then couple of days later I start getting multiple misfires and always different cylinders, after clearing the codes everything was fine again till next cold start. And then last night after I started the car and getting the usual rough idle, I smelled gas and smoke start coming from the exhaust.. I shut it down and now it doesn't start at all... I have few coils replaced and all new NGK spark plugs at 0.022, I doubt its that, because all misfires are in different cylinders.. Is it possible that my oxygen sensors went south, ECU or fuel injectors?? I did put inline walbro but that was a while ago so shouldn't be a problem with that. Thanks

[Pr335bob]

Different cyl? Which ones? Maybe they are in the same bank? Were they cyls 1,2,3 or 4,5,6 together . Or was it random?

[joro2077]

I took off the coils and plugs and when cranking find out injector in cyl 1 is leaking... so now deciding what to do .. cheap way is to replace only one 261 or do it right and replace all 6 with the latest version 079. Looking to get a good deal on set of 6 of the latest 079. Hope that there isn't any other damage.

[BMWM.D.]

Sounds like an injector issue to me. Not much else will cause fuel smell and smoke like that. Probably not a good idea to keep trying to start and drive it -- I've seen them leak into the cylinder so bad that it hydro-locks the engine.

When you say "it doesn't start", do you mean it doesn't crank, or it cranks but won't fire?

[joro2077]

Yes the engine was hydro-locked cause it didn't crank at all, then I removed the coils and plugs and start cranking and got all of the fuel out, but because injector in 1 is bad it was still spraying gas out even disconnected. Do you think I caused damage or I can just put new injectors?

[Ingeniator]

You need to run a compression test and likely a leak down. If your lucky it didn't bend anything.

[BMWM.D.]

Yeah, pretty much what he said. Although it will probably be tough to get an accurate compression reading with that cylinder being washed out with fuel. It needs injectors and plugs. I'd probably replace them and hope for the best.

These engines are usually really tough, but I've seen rods get bent when this happens. Moral of this story: Don't keep driving your car when you start noticing something strange (i.e. driveability issue or CEL). Things don't fix themselves, so hoping it's going to go away isn't a great plan.

I do hope everything's okay though. Keep those fingers crossed.

[joro2077]

Thank you all. Ordered 6 new injectors

[joro2077]

Update: 6 injectors replaced but cold start rough idle was still there, then changed the spark plugs from NGK to regular Bosch and everything is back to normal, I dont feel like playing around with different gaps so Bosch plugs for now. I was driving with NGK for a month with no problems, maybe when my injector got stuck open cause them to fail...