[Kratos335]

hello so i have fbo 335 with Cobb ap Running stage 2+, i've been trying to chase down this misfire in cylinder 3, i have swapped coils, and plugs even bought new ones with no success, i admit i havent done walnut blast yet, but the misfire is only in 1 cylinder, should it be safe to say i need a new injector?? and can i only swap 1 injector being the fact its so pricey?

[Blaizon]

Originally Posted by Kratos335

hello so i have fbo 335 with Cobb ap Running stage 2+, i've been trying to chase down this misfire in cylinder 3, i have swapped coils, and plugs even bought new ones with no success, i admit i havent done walnut blast yet, but the misfire is only in 1 cylinder, should it be safe to say i need a new injector?? and can i only swap 1 injector being the fact its so pricey?

Is the car throwing any codes? Typically if you need to change injectors, you change a complete bank then have them coded.

[itsmehtim]

I'm going thru this same issue but my car is stock I've had cylinder 3 misfire for almost a month now I changed the spark plugs and coil packs and I changed #injecotr with no luck

[Kratos335]

Originally Posted by itsmehtim

I'm going thru this same issue but my car is stock I've had cylinder 3 misfire for almost a month now I changed the spark plugs and coil packs and I changed #injecotr with no luck

Did u get the injector coded and is it the same index

[Kratos335]

Originally Posted by Blaizon

Is the car throwing any codes? Typically if you need to change injectors, you change a complete bank then have them coded.

P2aaf fuel pump plausible
29a3 o2 sensor low signal( I had this code after a vcg swap I figured mechanic messed something up, so I bought a new one swapped in with downpipes and still have that code and Cobb tune hasn't ignored it so I have a cel because of this also...) but my main concern is cylinder 3 misfire only I don't believe the 02 sensor is causing a single cylinder misfire...could I swap injector 3 to 2? Do I need to replace the o ring when doing so if it's possible?

[Kratos335]

Any people in NYC that could give me a hand diagnosing this I don't want to buy parts I don't need and spend an arm and a leg lol, I just bought my fbo setup and it worked great for 2 weeks the power was amazing I need that feeling back haha

[arhoads335i]

pull that plug out and see if its wet and or smells like gas. Is the misfire only on start up over night?

[Kratos335]

I'm going to try to datalog for the first time I will post my results when I get home using this info

http://www.e90post.com/forums/showthread.php?t=696472

But will this help with figuring out a possible injector problem or do I need to add in short term and long term fuel trims in this test?

[itsmehtim]

Originally Posted by Kratos335

Did u get the injector coded and is it the same index

I didn't

[Kratos335]

Originally Posted by itsmehtim

I didn't

This is why I'm scared lol our cars are so technical u probably should buy a full set of injectors I've read and get them coded eeuroparts have a full set for about 800 bucks I'm not confident with coding but there is a tutorial somewhere

[arhoads335i]

If you have index 11 injectors you can just put in index 12 at free will but you should have them coded. BimmerGeeks can do this for you remotely. If your injectors are not index 11 you should replace a the 3 on the same bank.
https://www.bmwpartsworldwide.com/oe...00-13538648937