[HeatGun]

Hi all,
I have a 2009 E90 with N54. It’s got 100k miles.
Recently, the vehicle started throwing out misfire codes around cyl #5.
I replaced all the coils and spark plugs. The code appears under WOT only. At normal driving, there are no issues, but I get CEL on as soon as I floor it.
So then I removed the spark plug #5 again and realized that plug was covered with oil. This time I replaced the whole valve cover gasket, replaced spark plug #5 also with the new one, and unfortunately the same problem.
What is the next step now?

[Bimmer_Bro]

Originally Posted by HeatGun

Hi all,
I have a 2009 E90 with N54. It's got 100k miles.
Recently, the vehicle started throwing out misfire codes around cyl #5.
I replaced all the coils and spark plugs. The code appears under WOT only. At normal driving, there are no issues, but I get CEL on as soon as I floor it.
So then I removed the spark plug #5 again and realized that plug was covered with oil. This time I replaced the whole valve cover gasket, replaced spark plug #5 also with the new one, and unfortunately the same problem.
What is the next step now?

Is the oil issue solved?
Does it rough or long cranks on cold start ups?
I would let it sit overnight and then before you start it, pull that#5 plug and see if the tip looks wet. If so you could have a leaky injector.
Do you know what index your injectors are?
Ever done a walnut blast ?

[bimmaa]

Originally Posted by Bimmer_Bro

Is the oil issue solved?
Does it rough or long cranks on cold start ups?
I would let it sit overnight and then before you start it, pull that#5 plug and see if the tip looks wet. If so you could have a leaky injector.
Do you know what index your injectors are?
Ever done a walnut blast ?

+1 on looking into index 12's if not already installed

[HeatGun]

Originally Posted by Bimmer_Bro

Is the oil issue solved?
Does it rough or long cranks on cold start ups?
I would let it sit overnight and then before you start it, pull that#5 plug and see if the tip looks wet. If so you could have a leaky injector.
Do you know what index your injectors are?
Ever done a walnut blast ?

I haven’t checked the spark plugs after I installed them.
Injector removal tool will arrive tomorrow and I’ll swap injector 5 with a working one to see if it’s the issue. I assume all injectors are stock. I am not sure what index these injectors are. What am I looking there?

[Bimmer_Bro]

Originally Posted by HeatGun

I haven’t checked the spark plugs after I installed them.
Injector removal tool will arrive tomorrow and I’ll swap injector 5 with a working one to see if it’s the issue. I assume all injectors are stock. I am not sure what index these injectors are. What am I looking there?

There is a Number right on the injector that says what index it is. You can see this number without removing them. Index 11 and 12 is preferred. Look at the number of all 6. Only index 11 can be mixed with index 12, nothing lower. Pull that #5 plug after the car has sat to see if it's wet (before you swap injectors around. )

[cshiznitzj]

Good advice but yes you can run mixed injectors. BMW states not to but there is plenty of examples of people doing it, and reporting its fine. My car has been running on mix of 12 and 9 on same bank for years! logs still look good. Log and review the data at start up and while driving.

[HeatGun]

Originally Posted by Bimmer_Bro

There is a Number right on the injector that says what index it is. You can see this number without removing them. Index 11 and 12 is preferred. Look at the number of all 6. Only index 11 can be mixed with index 12, nothing lower. Pull that #5 plug after the car has sat to see if it's wet (before you swap injectors around. )

Alright, I’ll do it tomorrow once I have the swap tool.
Last time I removed the coils I noticed lots of fuel around it and oil in the spark plugs.
Replacing valve cover gasket should took care of the oil issue, I’ll check coils for fuel and plugs for oil again
I have protool for coding so in case if I need to swap injectors

[Ex Drive]

Had the same problem on the first 2 cylinders. I installed 3 index 12 on bank one & been fine ever after. Good luck!

[HeatGun]

Originally Posted by Bimmer_Bro

There is a Number right on the injector that says what index it is. You can see this number without removing them. Index 11 and 12 is preferred. Look at the number of all 6. Only index 11 can be mixed with index 12, nothing lower. Pull that #5 plug after the car has sat to see if it's wet (before you swap injectors around. )

I did confirm that all 6 injectors are index 12.
Does this mean at some point injectors were replaced?

[Bimmer_Bro]

Originally Posted by HeatGun

I did confirm that all 6 injectors are index 12.
Does this mean at some point injectors were replaced?

Most likely yes. Maybe under the recall that effected some owners. I have a 2010 Lci and mine are a mix of 11 and 12s.
You could still have a bad injector tho. Best to determine first if #5 is leaking or not.

[HeatGun]

Originally Posted by Bimmer_Bro

Most likely yes. Maybe under the recall that effected some owners. I have a 2010 Lci and mine are a mix of 11 and 12s.
You could still have a bad injector tho. Best to determine first if #5 is leaking or not.

Make sense. What could be the reason for fuelly #5 coil? When I removed it the it was covered with fuel.

[Bimmer_Bro]

Originally Posted by HeatGun

Make sense. What could be the reason for fuelly #5 injector? When I removed it the it was covered with fuel.

The spark plug was covered in fuel? Or the injector you removed ?

[HeatGun]

Originally Posted by Bimmer_Bro

The spark plug was covered in fuel? Or the injector you removed ?

Sorry I corrected it. The coil was covered with fuel.

[Bimmer_Bro]

Originally Posted by HeatGun

Sorry I corrected it. The coil was covered with fuel.

You may possibly have a leak around that injector or the on fuel rail.
I would have some one run it and rev it a bit as your look to notice anything obvious( dripping or even a fine mist. )
Once you get the leak solved I would get a new coils for #5. Gas can ruin them pretty quick.

[HeatGun]

Originally Posted by Bimmer_Bro

You may possibly have a leak around that injector or the on fuel rail.
I would have some one run it and rev it a bit as your look to notice anything obvious( dripping or even a fine mist. )
Once you get the leak solved I would get a new coils for #5. Gas can ruin them pretty quick.

I swapped the injector 5 with 1, coded using ProTool, replaced spark plug and Coil #5, still same problem. What I noticed though spark plug #5 was covered in clear liquid which smells like fuel. I installed the new plug and removed a few mins later without starting the engine and it was wet again.
CEL comes on immediately I go over 2.5-3k RPM. (See the video below)

All OBD monitors get ready with normal driving, no cell at all

[Ex Drive]

Originally Posted by HeatGun

I swapped the injector 5 with 1, coded using ProTool, replaced spark plug and Coil #5, still same problem. What I noticed though spark plug #5 was covered in clear liquid which smells like fuel. I installed the new plug and removed a few mins later without starting the engine and it was wet again.
CEL comes on immediately I go over 2.5-3k RPM. (See the video below)

All OBD monitors get ready with normal driving, no cell at all

Originally Posted by HeatGun

I swapped the injector 5 with 1, coded using ProTool, replaced spark plug and Coil #5, still same problem. What I noticed though spark plug #5 was covered in clear liquid which smells like fuel. I installed the new plug and removed a few mins later without starting the engine and it was wet again.
CEL comes on immediately I go over 2.5-3k RPM. (See the video below)

All OBD monitors get ready with normal driving, no cell at all

Well, all of the spark plugs are going to be sorta wet if you just ran the car. It would be better w some pictures for me to see how wet. Anyway, is the injector you replaced the cylinder 5 with brand new remanufactured, or recycled from your other cylinders?

[HeatGun]

Originally Posted by Ex Drive

Well, all of the spark plugs are going to be sorta wet if you just ran the car. It would be better w some pictures for me to see how wet. Anyway, is the injector you replaced the cylinder 5 with brand new remanufactured, or recycled from your other cylinders?

Car has been sitting for about 3 days without a start.
I did not use a new injector, I removed injector #1 and swapped with #5.

[HeatGun]

I bought a refurbished injector for cyl #5 and it’s still the same. Every time I insert the injector and remove immediately I see oil at the tip. See the image below.

https://ibb.co/tq83NjL

I replaced the valve cover gasket 2 weeks ago due oil found in the spark plugs.