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| 05-13-2012, 11:56 AM | #1 |
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Smoke on Deceleration
After a cold start and when my oil is still warm, sometimes when i pull up to a stop sign i get a puff of whiteish smoke out my exhaust. Smells like oil. I cannot figure out what is causing it to save my life. Car has 29k miles and i just replaced the PCV and the pcv2 valve from RB turbos. It seems to happen more in the warm weather.. The car boosts fine and holds strong. Could this be carbon build up issues? I have the bms occ also...
Really appreciate your input!
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Last edited by SukSqueezeBangBlo; 05-13-2012 at 12:49 PM.. |
| 05-15-2012, 09:14 PM | #6 |
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Let us know what you find. I have had this problem as well. I had straight pipes from Berk, and AA downpipes. I took the downpipes and exhaust off, and put a Berk street exhaust on with stock downpipes and the smoke is gone....i will be putting the downpipes back on as soon as i can. Im curious to see what exactly is the problem. What you are describing is the exact same thing that had happened to me. Please keep us posted.
P.S. how much oil are you consuming? my car needs oil added to it every 800-1200 miles, is yours having the same issue?
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Space Grey 135i: BMS DCI, JB4, AA Downpipes, Berk Full Street Exhaust.
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| 05-16-2012, 02:19 AM | #8 |
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everyone who has this smoke issue seems to be consuming oil at a different rate, i was just curious. Anyhow, good luck with everything and let us know how it turns out!
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| 05-16-2012, 07:09 AM | #9 |
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Did you figure it out? I can't help but wonder why you replaced your PCV valve? Was it clogged, or just preventative maintenance? From my experience, white smoke is water or antifreeze. White-blue smoke is oil or transmission fluid. White smoke is generally water in the combustion camber or exhaust system, and could indicate anything from a cracked or warped head, a bad head gasket, a bad seal between the block and the oil filter housing (it's water cooled), or just condensation boiling off in the exhaust. White-blue smoke is oil getting into the combustion camber. If the smoke occurs at startup and goes away once warm, it could be your valve stem seals. The oil passes the seals when the car sits for a period of time, burns of in the first few seconds the car is started, and stops smoking completely once the seals heat up and expand. Continuous white-blue smoke while driving is typically worn piston rings. The fact that it occurs at startup and you replaced your pcv valve makes me think in may be valve seals. The same gunk that clogs a pcv valve can coat the valve seals and cause them to "dry up" and shrink. I had the same issue on an infiniti g35. Before replacing the seals I gambled and tried running Seafoam in the oil. It actual worked. It must have desolved the gunk and the valve seals swelled and stopped leaking.
Good luck, and keep us posted. |
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| 05-16-2012, 08:59 AM | #10 |
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Drives: 2009 M-Sport 135i
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I have this too, but I have catless downpipes and am running the stock exhaust (stock midpipe an axelback) because I was rearended and my aftermarket exhaust was bent and the new exhaust I'm getting isn't available yet. I also have the injen intake, AMS intercooler and am running the COBB stage 2+ tune. I brought it in to the dealership for routine service and had him check it out and he said its likely due to the tune with the stock exhaust because there is nothing wrong with the car. He said if it's still doing it after I get the other exhaust on, they can look at it again.
Let me know what you find out! |
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| 05-16-2012, 05:27 PM | #14 |
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i have this aswell i have downpipes and full race exhaust no cats/mufflers and a catch can and tune and other bits aswell
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| 05-16-2012, 10:36 PM | #15 |
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I've heard that a blockage in any of the tubes from the occ can cause white smoke to come from the exhaust. Maybe check the piping for any kinks which could be restricting air flow.
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| 05-20-2012, 03:09 AM | #16 |
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Ok, i'm going to start off by saying that i am no expert...but i had the same issues when i installed my ar design cattless DP's. I had the RPI quad exhaust on my car already before i installed the DP's. As soon as the DP's were installed and i drove home, i noticed the smoke. It was worse on deceleration (like coming to a stop light). The car went through a full qt of oil in just 60 miles!! I reaserched everything possible before i touched or drove the car again. I talked to a master mechanic at BMW of Dallas and he told me it could be a few different things. 1) May need to uninstall the OOC (I did and it did not fix the issue). 2) Try a heavier oil (I didnt try this because i just had my oil changed). 3) Turbos and or seals are shot (I refused to take that for an answer because my car only has 10K miles and the problem started as soon as i went cattless. 4) try a restrictive orphis on the oil feed lines that feed the turbos (I didnt want to do this because my car is still under warranty). So i did some more reaserch and figured it may be a backpressure issue with having no cats.
I installed the factory exhaust back on the car (i have an 08 so the exhaust has cats on the midpipes). My oil level on the car was about 3/4 of a qt low. I drove for about 50 miles and checked the oil lvl again and it was a full qt low (so it burned another 1/4 qt). I added a qt and now have driven 310 mile since then with no smoke or no oil consumption what so ever!! I'm so happy my car is fixed!! I know i will be asked the question so i will answer now. The reason i put the factory exhaust back on instead of the factory DP's is the hp gains from the DP's and much greater than the exhaust. Thats the only reason. I hope this helps everyone out there with the smoking after dp's issue! |
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| 05-20-2012, 11:13 AM | #17 |
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That"s so weird though. The stock exhaust must be very restrictive, enough that it would stock smoke from coming out your exhaust. I feel like you're just masking the problem but re installing the stock exhaust
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| 05-20-2012, 07:01 PM | #18 |
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Smoke on decel, if it's black, and you're not burning oil... isn't it unburnt fuel? Possibly a confused ECU since there's no cats?
Just a thought. |
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| 05-20-2012, 09:55 PM | #19 |
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How would i be masting the problem? I was consuming oil when i was fully cattless, and now i havent consumed any at all since reinstalling factory exhaust with cats. Im pretty sure these cars need some sort of backpressure (i.e. Cats). Cats will mask the smoke from the oil getting passed the turbo seals also. Im just saying, by reinstalling cats on my car...it fixed the issue. Maybe something u wanna try. and its much cheaper/less time consuming to put the factory exhaust back on the car vice DP's.
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| 05-20-2012, 11:29 PM | #20 | |
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Quote:
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