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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 > Cloud of smoke on deceleration



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      03-19-2012, 01:33 PM   #1
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Cloud of smoke on deceleration

Hey guys I noticed that sometime when I go wot and then come to stop for a red light or wtv a huge cloud of white smoke comes out of the exhaust. The exhaust is comepletely stock so all 4 cats and I know some of you will say turbo seals but I never have to add oil nor do I hear any turbo whine. So what do you guys think it is?
Btw It was pretty cold when this happened so I know its normal to see smoke coming out of cars when its cold out, but a lot of
Smoke comes out, and only on deceleration!
Any ideas?
Thanks guys.
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      03-19-2012, 01:34 PM   #2
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turbos going

or condensation.
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      03-19-2012, 01:39 PM   #3
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Ill try now thats its getting hot outside, hopefully its just dur to the cold weather, Ill report back.
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      03-19-2012, 04:02 PM   #4
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I get the exact same thing and the car is running strong. I've been told that its just oil burning from not having a catch can, not the turbo seals going since its not while on boost.
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      03-19-2012, 04:19 PM   #5
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Does it happen when the car is fully warm, all the time?
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      03-19-2012, 04:37 PM   #6
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Well i made this thread becuase on the weekend I had some friends in the car, it was cold outside so its normal to see some amoke but the car was fully warmed up I dis a pull and stopped for the red light and I saw a lot of white smoke come out of the exhaust(a big cloud lol), Ive noticed this before but only recently and its been cold out so Im hoping its due to the weather and bot the turbo seals.
If the thrbos were on their way out wouldnt I hear whining and burn oil?
Maybe the smoke if from something else?
Ill try it out tomorow during the day since its going to be hot tomorrow, Ill let you guys know.
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      03-20-2012, 09:25 AM   #7
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Quote:
Originally Posted by 135iSB View Post
I get the exact same thing and the car is running strong. I've been told that its just oil burning from not having a catch can, not the turbo seals going since its not while on boost.
i smoke on decal too, and i have a catch can... also no whine and car pulls hard with no other problems....
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      03-20-2012, 11:02 AM   #8
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Try replacing the vent hose at the back of the valve cover to the rear turbo inlet, pn 11 15 7 553 949. This pipe has a vacuum limiting valve that can go bad. Otherwise it's a bad turbo or bad valve stem seals, neither of which are cheap or easy. The vent pipe, however, is only $33 retail.
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      03-20-2012, 11:26 AM   #9
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Whats involved in changing or even checking/diagnosing the valve stem seals? Can it be done without taking the cylinder head off?
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      03-20-2012, 12:17 PM   #10
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Quote:
Originally Posted by JamesM3M5 View Post
Try replacing the vent hose at the back of the valve cover to the rear turbo inlet, pn 11 15 7 553 949. This pipe has a vacuum limiting valve that can go bad. Otherwise it's a bad turbo or bad valve stem seals, neither of which are cheap or easy. The vent pipe, however, is only $33 retail.
do you have any pics of the vent hose location or a diy on this???
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      03-20-2012, 04:07 PM   #11
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If you have all your cats and your seeing smoke you should look into this further.

My guess is the seals.. mine went and the car was running perfectly. You don't need to be replacing oil for the seals to be enough oil to smoke.

If its under warranty I would get it looked at asap..
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      03-20-2012, 08:38 PM   #12
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FWIW i am completely catless
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      03-20-2012, 09:29 PM   #13
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I just went out now to retry it, went wot for a few seconds on an empty road came to a quick stop and go out to see how muxh smoke would come out and honestly not much compared to what happened a few days ago. The weather has changed dramaticaly so Im hoping that it was just due to the cold weather..obviously it smoked a bit but Im assuming thats completely normal after going wot.
Putting on my summer rims tomorrow and Ill try it in sunlight to see if it remains the same!
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      04-17-2012, 07:47 PM   #14
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still smoking???
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