[deadlyke]

Hello evrybody i have a really wierd issue with my car and i can't find any results online ,not even my mechanic can't find anything.I tryed 3 diffrent garages but none of them finded my problem

So i have this missfire issue only on Cylinder 6 and only with cold engine in cold weather (bellow 20C) and triggering the check engine light but when i restart the car the light is gone,missfire gone and evrything is running smoothly
Sometimes i need to restart the engine 2-3 times bcz after the first restard the check engine light disappear but soon will be back until the 2nd or 3rd restart,(i think when the oil or coolan reach a temperature).
And always just the cylinder nr 6,sometimes nr 1 but when #1 missfires the check engine light wont go away after restart just when i delete the fault code.

Oh and with cold engine i have some grinding noise from the engine arround 2k rpm ,but only in the frist few minutes.

The things what i did allready:

All 6 Sparkplugs and Ignition coil was replaced with brand new ones
Injector #6coded and evrything,buyed a new injector
Both Vanos solenoid replaced with news
Maf sensor replaced.
Compression test on all cylinders and evrything was allright

The picture bellow is from inpa because the values looked strange for me.

So i ask this community if anybody know anything what can cause this wierd issue it will be helpful

Car details are BMW E93,2007,3.0 L, Convertible,N53 engine,111k miles

[i7ab1an]

Injector coded? N52 engines. Yours... don’t get injectors coded or anything. Was the injector replaces?

I would say the injector is fried

[deadlyke]

Yes the injector was replaced and coded correctly. And checked all the 6 injectors just in case and readjusted all of them.
But my issue isn't gone 😢

[siloansa]

Originally Posted by deadlyke

Yes the injector was replaced and coded correctly. And checked all the 6 injectors just in case and readjusted all of them.
But my issue isn't gone 😢

+1

[bmdubya1198]

You could try swapping the #6 injector to #5 and see if the misfire moves with it. I think that injector may be going out.

[deadlyke]

Originally Posted by bmdubya1198

You could try swapping the #6 injector to #5 and see if the misfire moves with it. I think that injector may be going out.

i tryed but still only the cylinder 6 missfires and only with cold engine when the temperature is bellow 20C
If outside the weather nice and warm even with the first start, no missfire, no check engine light notthing. so thats wierd.

[bmdubya1198]

Originally Posted by deadlyke

i tryed but still only the cylinder 6 missfires and only with cold engine when the temperature is bellow 20C
If outside the weather nice and warm even with the first start, no missfire, no check engine light notthing. so thats wierd.

Have you changed your coolant temp sensor? It sounds like it may be failing.