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steve30 steve30 is offline
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Car: E36 M3, E90 335i
Default N54 Burning/consuming oil - 09-12-2017, 04:27 PM

Hey guys, my n54 has recently been smoking a lot at idle and when I do a hard pull. The car is single turbo and I recently had the ******** off. There was no sign of oil leaking from the turbo so I'm assuming this has to be either the valve cover, valve seals, or piston rings..

decided to pull the plugs to get an idea of whats going on in the motor.



From left to right cylinder 6-1. Looks like 6 and 1 have oil buildup. I'm guessing the valve cover is clogged. There was some oil on cylinder 1 spark plug threads. I opened the oil cap while the car was idling and no smoke is coming from the there.

I have a video of the car idling.



Thanks!

Last edited by steve30; 09-12-2017 at 10:23 PM..
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Dave @ Fuel-it!'s Avatar
Dave @ Fuel-it! Dave @ Fuel-it! is offline
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Car: E92 335XI
Default 09-13-2017, 09:31 PM

What does your PCV setup look like ?



http://www.fuel-it.biz/

e92 AT 335xi 2.0
Pure Turbos
TFT Inlet System
Fueling by Fuel-It!
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steve30 steve30 is offline
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Default 09-14-2017, 08:16 AM

I have the rb pcv valve and the stock blow by vent hose is open to atmosphere.

I'm leaning towards valve seals as the plugs cylinders 6 and 1 are fouled pretty badly.

Last edited by steve30; 09-14-2017 at 08:30 AM..
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steve30 steve30 is offline
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Default 09-14-2017, 05:07 PM

update: I had a misfire on cylinder 6 so I decided to unplug the coil to cyl. 6 with the car idling. As soon as I unplugged it the car stopped smoking completely. It also seems like the smoking is not oil, but fuel. I've ordered a new set of index 12 injectors as the car is currently on index 10 and older. Hopefully its just a leaky injector. The car has also had rough starts which points to a leaky injector. I'm also going to hook up a catch can to the blowby hose and see how much oil collects there. Hopefully this solves everything!
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steve30 steve30 is offline
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Default 09-20-2017, 05:36 PM

Thought I would update the thread for future help. Brand new index 12 injectors have been installed and the smoking is gone. There is a slight burnt/carbon smell coming from the exhaust. I'm thinking its time for a walnut blast.

Photo of the original injectors, they were all index 9. Looks like a lot of buildup which was probably affecting the spray pattern..




I will also be changing the valve cover as well as hook up my BMS catch can.
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