Slight blue smoke at steady RPM's in sixth gear

iEatSand · 02-18-2020, 08:28 PM

Had this issue a while ago after changing my valve cover gasket. At first I thought i overfilled the oil so I did an oil change. Car was solid for about a week then it started happening again. I'll occasionally get smoke while holding RPM's in traffic after an extended period of time. The smoke is blue(oil), and smells. Curious if the VGC isn't sealed properly? Could it need a walnut blasting? Also curious if it could be the crankcase breather hose on the backside of the valve cover, or the PCV. I broke crankcase breather in half and taped it up. New one is on the way. Praying it isn't the turbskis going out.

Mr Gasser · 03-18-2020, 08:52 AM

don't know mileage but it would be good to get all the crankcase ventilation sorted out.

After that, if it still does it, may want to take out the plugs and do a compression test.

iminhell1 · 03-19-2020, 12:38 PM

Steady, sounds like a cracked ring to me.

tracer bullet · 03-19-2020, 01:40 PM

Describe again when you see it, what speed you are at, if you are accelerating, and so on. Seeing smoke while at highway speeds isn't very common - airflow over the car and such if nothing else.

iEatSand · 03-21-2020, 01:14 PM

I changed the crankcase breather hose and it seems there's no longer blue smoke coming from the exhaust... Haven't been driving it that much due to business being fast and picking up multiple cars that I've been driving instead.

I did take it out last night and had stuff done to it. I've got some stuff to do today so I'll be driving it around and holding RPM's etc to see if the issue persists.

Thank you!

Dackelone · 03-21-2020, 02:01 PM

Have you removed the cats ? ie: Are you running catless down pipes ? IF so expect some smoke, especially on start up.

When you replaced the valve cover gasket... did you buy the entire plastic valve cover that comes with a new PCV and gasket and aluminium bolts. ?

Dack

iEatSand · 03-22-2020, 12:38 PM

Quote:

Originally Posted by Dackelone

Have you removed the cats ? ie: Are you running catless down pipes ? IF so expect some smoke, especially on start up.

When you replaced the valve cover gasket... did you buy the entire plastic valve cover that comes with a new PCV and gasket and aluminium bolts. ?

Dack

It's got Matt Schnell performance downpipes thermal coated etc.. Other cats still intact. I didn't buy the entire valve cover assembly, just the gasket... too be honest I should've bought an entire new assembly. I'll probably change it again for peace of mind

02-18-2020, 08:28 PM	#1
iEatSand Private 15 Rep 71 Posts Drives: EvoIX, 135i, Fisker Karma ES Join Date: May 2019 Location: Oregon iTrader: (0)	Slight blue smoke at steady RPM's in sixth gear Had this issue a while ago after changing my valve cover gasket. At first I thought i overfilled the oil so I did an oil change. Car was solid for about a week then it started happening again. I'll occasionally get smoke while holding RPM's in traffic after an extended period of time. The smoke is blue(oil), and smells. Curious if the VGC isn't sealed properly? Could it need a walnut blasting? Also curious if it could be the crankcase breather hose on the backside of the valve cover, or the PCV. I broke crankcase breather in half and taped it up. New one is on the way. Praying it isn't the turbskis going out.
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03-18-2020, 08:52 AM	#2
Mr Gasser First Lieutenant 73 Rep 341 Posts Drives: 135i 09 M-Sport Black on Black Join Date: Jan 2016 Location: Texas iTrader: (0)	don't know mileage but it would be good to get all the crankcase ventilation sorted out. After that, if it still does it, may want to take out the plugs and do a compression test. __________________ Metallic Black on Black 2009 135i, new waterpump, OFHGs, and VC gasket...RB turbo PCV valve (ooo), NGK performance plugs...V3Cobb access port stage 2+FMIC, Injen intake, Mishimoto clone FMIC, ARM charge pipe, ARM downpipes, Whiteline subframe bushings
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03-19-2020, 12:38 PM	#3
iminhell1 C2H5OH 3915 Rep 2,144 Posts Drives: 2010 SG 135i auto Join Date: May 2015 Location: Darwin, MN iTrader: (1)	Steady, sounds like a cracked ring to me.
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03-19-2020, 01:40 PM	#4
tracer bullet Brigadier General 2410 Rep 3,547 Posts Drives: '11 135i , '15 X3 35i Join Date: May 2011 Location: Saint Paul, MN iTrader: (1)	Describe again when you see it, what speed you are at, if you are accelerating, and so on. Seeing smoke while at highway speeds isn't very common - airflow over the car and such if nothing else.
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03-21-2020, 01:14 PM	#5
iEatSand Private 15 Rep 71 Posts Drives: EvoIX, 135i, Fisker Karma ES Join Date: May 2019 Location: Oregon iTrader: (0)	I changed the crankcase breather hose and it seems there's no longer blue smoke coming from the exhaust... Haven't been driving it that much due to business being fast and picking up multiple cars that I've been driving instead. I did take it out last night and had stuff done to it. I've got some stuff to do today so I'll be driving it around and holding RPM's etc to see if the issue persists. Thank you!
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03-21-2020, 02:01 PM	#6
Dackelone European Editor 10539 Rep 22,992 Posts Drives: N54 e82 Join Date: Feb 2010 Location: Bayern, Germany iTrader: (1)	Have you removed the cats ? ie: Are you running catless down pipes ? IF so expect some smoke, especially on start up. When you replaced the valve cover gasket... did you buy the entire plastic valve cover that comes with a new PCV and gasket and aluminium bolts. ? Dack __________________ Dackel's European Delivery Museum Guide
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