f12 smoke after decel

GinoMachino · 08-10-2021, 10:13 AM

please delete. thank you

arucano · 08-10-2021, 02:50 PM

Valve seals usually more "active" at startup or pull-away after idling.. If smoking under deceleration in gear, it is likely something with the crank case ventilation.

arucano · 08-10-2021, 08:20 PM

Check these valves (item 1) in the crank case breather lines. The other possible cause can be the oil separator in the valve cover.

Kamate · 08-11-2021, 12:55 PM

I would recommend you to pull both intake pipes out to see if there is any oil going into your intake first. The ones after the intercooler going into the intake. If it’s soaked with oil then you can at least know it’s not your valve stem seals. Your problem can narrow down to either pcv system, your turbos or your engine ring causing blowby.

08-10-2021, 10:13 AM	#1
GinoMachino New Member 0 Rep 6 Posts Drives: BMW 650i Join Date: Jul 2019 Location: Toledo OH iTrader: (0)	f12 smoke after decel please delete. thank you Last edited by GinoMachino; 09-07-2021 at 09:07 PM..
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08-10-2021, 02:50 PM	#2
arucano Captain 251 Rep 631 Posts Drives: 2014 M6 Grand Coupe CP Join Date: May 2017 Location: Kingwood TX iTrader: (0) Garage List 2014 BMW M6 GC [10.00]	Valve seals usually more "active" at startup or pull-away after idling.. If smoking under deceleration in gear, it is likely something with the crank case ventilation. __________________ F06 M6 Grand Coupe CP Sapphire Black Metallic The drive is the destination
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08-10-2021, 08:20 PM	#3
arucano Captain 251 Rep 631 Posts Drives: 2014 M6 Grand Coupe CP Join Date: May 2017 Location: Kingwood TX iTrader: (0) Garage List 2014 BMW M6 GC [10.00]	Check these valves (item 1) in the crank case breather lines. The other possible cause can be the oil separator in the valve cover. Attached Images __________________ F06 M6 Grand Coupe CP Sapphire Black Metallic The drive is the destination
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08-11-2021, 12:55 PM	#4
Kamate Private 31 Rep 71 Posts Drives: BMW m6 Join Date: Jun 2021 Location: Bay area iTrader: (0)	I would recommend you to pull both intake pipes out to see if there is any oil going into your intake first. The ones after the intercooler going into the intake. If it’s soaked with oil then you can at least know it’s not your valve stem seals. Your problem can narrow down to either pcv system, your turbos or your engine ring causing blowby.
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