[Kuudt]

So i got 325xi with n53b30a engine. First it started with rough idle when engine was cold, after while some mild motor shake came along. (Problem goes away after while when the engine starts to warm up). Now the yellow check engine symbol lights up every time i cold start so i did get the codes read.

0x0029
D2
DME: Combustion misfires, cylinder 6

0x0030
E9
DME: Nitrogen-oxide catalytic converter, ageing

I did change the sparkplug and ignition coil on cylinder 6, didnt help... My friend told me it might be time to buy new injectors, at least to the bank where cylinder 6 is. Just asking guys your opinion since iv read injectors are pretty expensive job to do. And about that Nox, iv already bought Noxemulator, but its still in the box. Is it smart to install it after i solve this misfire problem?

And sorry about my grammar, english isnt my native language

[Kuudt]

Heres some livedata.

[marvinstockman]

Could be a lifter that needs to be pumped up, especially if it only happens on a cold start.

See if you can mitigate by keeping idle up with the throttle.

A bad injector would cause trouble all the time.

[Kuudt]

Originally Posted by marvinstockman

Could be a lifter that needs to be pumped up, especially if it only happens on a cold start.

See if you can mitigate by keeping idle up with the throttle.

A bad injector would cause trouble all the time.

Yeah it will help, but i heard that injector can leak when its cold but after warming up it will work properly?

[F31B48]

Originally Posted by Kuudt

Yeah it will help, but i heard that injector can leak when its cold but after warming up it will work properly?

N53 injectors are notorious for giving cold start rough running issues. Do you know what revision number the injectors are?

[Kuudt]

Originally Posted by EvaBmw

N53 injectors are notorious for giving cold start rough running issues. Do you know what revision number the injectors are?

Not yet, i will open up motor covers tomorrow and check that.