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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 > Smoke from engine bay and exhaust after doing downpipes



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      12-22-2012, 05:05 PM   #1
brosey88
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Smoke from engine bay and exhaust after doing downpipes. Please help!

I just bought my 2008 335xi a few weeks ago and last night i did cp-e catless downpipes AE exhaust and a jb 4 tuner. I noticed smoke coming from the engine bay and from the exhaust not sure what the issue is. I think it could be the turbo seals but not sure. The smoke only happens at idle and the car is not burning any oil. Please help!!

Last edited by brosey88; 01-13-2013 at 09:34 PM.
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      12-22-2012, 05:12 PM   #2
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Typically most exhausts and downpipes are coated with a oil to prevent any sort of oxidation prior to customer installing. This way it maintains a healthy look when you open it out of the box. The smoke you are probably seeing are the oils applied to your DP's and Exhaust. It is nothing to worry about. Keep a eye on it though.
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      12-22-2012, 05:16 PM   #3
brosey88
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thats what i thought but the smoke from the engine bay is delayed like 30-60 seconds after start. im planning on putting it on a lift tomorrow to take a better look.
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      12-22-2012, 06:21 PM   #4
WilliamS
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Its likely just residue. its starting late becuase they have to heat up. Drive the car, after a spirited run it will be done.
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      12-22-2012, 09:32 PM   #5
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Residue that needs to be burned off or just smoke from going catless.


If you drive around & the smoke is still there once the engine's at normal operating temp (230-250), then you might wanna look into other possibilities (turbo seals, etc)
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      12-23-2012, 09:56 PM   #6
ek99civic
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Like everyone is saying, its normal. Replaced a header in the past and this same thing happened.
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      12-24-2012, 12:04 AM   #7
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Quote:
Originally Posted by Cripple View Post
Typically most exhausts and downpipes are coated with a oil to prevent any sort of oxidation prior to customer installing. This way it maintains a healthy look when you open it out of the box. The smoke you are probably seeing are the oils applied to your DP's and Exhaust. It is nothing to worry about. Keep a eye on it though.
+1 it's oils and grease from the install itself causing your engine bay to smoke. It will happen on turbo installs too.
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      12-24-2012, 01:01 AM   #8
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Put on some miles and see if it goes away, it's likely residue from the manufacturing process of the exhaust components. Especially when doing mandrel bending.
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      12-24-2012, 01:56 AM   #9
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If you used anything like PB Blaster to loosen the nuts, this stuff will smoke like crazy once the components get hot. Goes away in a few minutes though.
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      12-24-2012, 11:03 AM   #10
brosey88
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thanks alot guys i put some miles on it yesterday and it seemed to be good just smelt like burning oil a little which is prob just the downpipes.
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      01-13-2013, 08:49 PM   #11
brosey88
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I am still having the problem and am thinking about just putting the stock downpipes back on because i can't seem to figure this thing out. I am not burning any oil at all but yet it smells like burning oil and only happens at idle
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