Cokeing Intake on DI engines?

F32Fleet · 08-27-2009, 09:45 AM

Curious to hear people's opinion on the condition of the intake valves on that side. Do you guys think they're getting caked with crude since they're not geting bathed in gasoline to keep them clean?

FCP Euro · 08-27-2009, 02:45 PM

Do you have a picture of the valves?

HighVoltage · 08-27-2009, 03:23 PM

According to my dealer that is what happened to mine @ ~25K mi...Unfortunately I never got to see the intake valves while it was apart.

F32Fleet · 08-27-2009, 03:54 PM

Quote:

Originally Posted by FCPGroton

Do you have a picture of the valves?

Sorry, I didn't want to give the impression that I was having that problem (I have a 330 afterall), but I wanted to know if people were experiencing a lot of build up due to the use of direct injection. I don't think it would ever get as bad as some of the older VW diesel engines (carbon particulate + oil vapor+ condensation on intake = crude). I figure it has to be happening on these gasoline engines just not as bad.

raceyBMW · 08-28-2009, 03:28 PM

Yes, I can easily see how they can get buildup on the valves since they never get washed with fuel on a DI engine. Plus the N54 seems to have a lot of blow-by gasses, which only adds to the problem.

If you do a search, you can see some have tried SeaFoam and had good results. You just suck it in through the vacuum hose controlling the diverter valves. That's really about the only way to get them clean short of taking off the intake mani and cleaning them.

08-27-2009, 09:45 AM	#1
F32Fleet Lieutenant General 3790 Rep 10,545 Posts Drives: 2015 435i Join Date: May 2005 Location: Southeastern US iTrader: (0)	Cokeing Intake on DI engines? Curious to hear people's opinion on the condition of the intake valves on that side. Do you guys think they're getting caked with crude since they're not geting bathed in gasoline to keep them clean?
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08-27-2009, 02:45 PM	#2
FCP Euro Lieutenant 10 Rep 462 Posts Drives: Volvo 850 T5 Join Date: Aug 2009 Location: Old Saybrook, CT iTrader: (0)	Do you have a picture of the valves? __________________ sales@fcpeuro.com FCP Euro - European Car Parts Specialists
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08-27-2009, 03:23 PM	#3
HighVoltage . 42 Rep 867 Posts Drives: 07 E90 335i Join Date: Aug 2008 Location: . iTrader: (0)	According to my dealer that is what happened to mine @ ~25K mi...Unfortunately I never got to see the intake valves while it was apart. __________________ Not only will it kill you it will hurt the whole time while you're dying. http://www.stevesnovasite.com/ http://www.jalopyjournal.com/forum/ http://www.garagejournal.com/
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08-28-2009, 03:28 PM	#5
raceyBMW king of the hills 109 Rep 2,923 Posts Drives: 2011 M3 w/ESS55, 2001 540i/6 Join Date: Dec 2006 Location: Arvada, CO iTrader: (1) Garage List 2001 BMW 540i/6 [8.17] 1994 530i [9.00] 2007 335i Coupe [8.37]	Yes, I can easily see how they can get buildup on the valves since they never get washed with fuel on a DI engine. Plus the N54 seems to have a lot of blow-by gasses, which only adds to the problem. If you do a search, you can see some have tried SeaFoam and had good results. You just suck it in through the vacuum hose controlling the diverter valves. That's really about the only way to get them clean short of taking off the intake mani and cleaning them.
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