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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Lots of time and money invested to investigate deceleration smoke problem



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      08-09-2012, 10:12 PM   #23
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Not oil. Coolant leak somewhere. Thats my bet.
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      08-09-2012, 10:34 PM   #24
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I have the same issue after going catless. Been living with it for about 8k miles. Oil and coolant level stayed the same...so I was never able to pinpoint the problem. My next step is to replace injectors and see if that helps...
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      09-16-2012, 12:02 PM   #25
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Quote:
Originally Posted by DallasBoosted View Post
I had this problem on my Supra and it was valve stem seals.
must have been a red supra
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      09-16-2012, 02:22 PM   #26
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Alright, alright,

So it looks like you fell for the OCC "scam" as well, didn't you

The facts about OCCs are as follow:

1. Not a single Oil Catch Can can capture 100% of all oil fumes without choking the PCV system. Yes, they help, but again, not one of them will give you 100% efficiency.

2. The Oil Catch Cans work ONLY during times when there is boost! That's how the PCV check valves change the flow of the air. During cruising AND deceleration, the fumes do not go through the OCC.

Also, there are two check valves that can go bad. One is integrated into the valve cover itself and one is in that little tube that goes to the back of the rear intake tract.

Rob@RB sells upgraded PCV check valves for the one that screws into the valve cover itself. Users are reporting good results with those.

Finally, I've noticed that once the BMW factory oil gets about 3000 miles on it, the car starts to smoke more and consume more oil. If you have a fresh change of oil there is no oil consumption/smoking.

Good luck.
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      09-16-2012, 02:51 PM   #27
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Bum turbo....
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      09-16-2012, 04:45 PM   #28
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I had the exact same problem and I just replaced the turbos...all the smoke is gone. Oh and one turbo was definitely headed south...pretty hard to even spin by hand.
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      09-16-2012, 11:40 PM   #29
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This has happened on my RB turbos since day one. After an extensive search, it shows on "the other forum" that this issue is related to the oil return line and isn't necessarily bad either.

FWIW, I run on Castrol Syntec 5W-30, no OCC, upgraded RB PCV valve, no oil consumption issues at high boost.

I surmise this issue is MUCH more common than people let on both stock and upgraded RBs alike because not everyone is fully catless. It just has a larger spotlight on RB/ASR turbos because almost all of those guys are catless to begin with.
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      09-16-2012, 11:44 PM   #30
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Quote:
Originally Posted by vasillalov;126****3
Alright, alright,

So it looks like you fell for the OCC "scam" as well, didn't you

The facts about OCCs are as follow:

1. Not a single Oil Catch Can can capture 100% of all oil fumes without choking the PCV system. Yes, they help, but again, not one of them will give you 100% efficiency.

2. The Oil Catch Cans work ONLY during times when there is boost! That's how the PCV check valves change the flow of the air. During cruising AND deceleration, the fumes do not go through the OCC.

Also, there are two check valves that can go bad. One is integrated into the valve cover itself and one is in that little tube that goes to the back of the rear intake tract.

Rob@RB sells upgraded PCV check valves for the one that screws into the valve cover itself. Users are reporting good results with those.

Finally, I've noticed that once the BMW factory oil gets about 3000 miles on it, the car starts to smoke more and consume more oil. If you have a fresh change of oil there is no oil consumption/smoking.

Good luck.
Hmm, interesting. I thought the same thing, as my car needed a quart at around 4200 miles, but I was losing a quart every 500 miles after that.

Turned out, the lower oil line to the rear turbo had a pancaked corner on the ring gasket which caused oil to spew from that corner. Fixed with a new gasket from BMW ($1.09) and 3100 miles later, haven't burned a drop of oil with nearly 100+ 3rd gear pulls going into 4th at anywhere from 18 to 20 psi on RBs.

IMO, if ANYONE is losing large amounts of oil (1qt in less than 1500 miles) you have a leak that needs addressing.
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