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oil in my intake manifold
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smithpatrick



Joined: 05 Nov 2007
Posts: 44
Location: Southern New Jersey

PostPosted: Sun Apr 19, 2009 5:48 pm    Post subject: oil in my intake manifold Reply with quote

1990 325i 5 speed
I removed my my bypass valve boot,( the big rubber elbow)
Inside I found lots of oil along with seriously oil fouled plugs.I blame the serious fouling on this excess of oil in the intake. Let me say I am in no rush to take the head off.
Could this have been cause by my valve seal gaskets?
I've never seen this before, how about anyone else.[img]
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5 e30's 84, 87, 3 90's
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1995 e36 320i auto euro specs from canada, 98 323i auto
2001 e46 325i manual


Last edited by smithpatrick on Fri May 15, 2009 8:20 pm; edited 2 times in total
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85-325e



Joined: 30 Jun 2002
Posts: 4711
Location: Southampton, NY

PostPosted: Sun Apr 19, 2009 6:31 pm    Post subject: Reply with quote

Oil in that boot is common... oil fouled plugs are another issue I think...
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whiskeybravo



Joined: 24 Jul 2007
Posts: 159
Location: Virginia

PostPosted: Sun Apr 19, 2009 10:11 pm    Post subject: Reply with quote

Is oil in that boot ok? I also have oil in that boot and I have also found oil in the air box... what is it all coming from? How can you fix it? I don't mean to hijack this thread but I think that the oil in this boot is affecting my MAF so I would like to know where it is coming from.
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85-325e



Joined: 30 Jun 2002
Posts: 4711
Location: Southampton, NY

PostPosted: Mon Apr 20, 2009 12:12 am    Post subject: Reply with quote

I don't know exactly, but I know I've read it up here. It comes from the valve cover breather hose at the top back of the valve cover.
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idanity



Joined: 21 May 2005
Posts: 3097
Location: N.W.U.S.A.

PostPosted: Mon Apr 20, 2009 1:50 am    Post subject: Reply with quote

its very common..
but a photo would be nice to ensure were talking about the same amount.

what i find, is a small amount of varnish, every 6months to a year.
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whiskeybravo



Joined: 24 Jul 2007
Posts: 159
Location: Virginia

PostPosted: Mon Apr 20, 2009 7:24 am    Post subject: Reply with quote

85-325e wrote:
I don't know exactly, but I know I've read it up here. It comes from the valve cover breather hose at the top back of the valve cover.


I've read that as well... so I replaced that exact hose with a brand new one and I still get oil there. I guess some oil will always end up there via the hose?
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jlevie



Joined: 01 Jan 2005
Posts: 553
Location: Huntsvile, AL

PostPosted: Mon Apr 20, 2009 7:33 am    Post subject: Reply with quote

Oil in the intake on a higher mileage M20 engine is quite common. The cause of oil being there will be worn valve seals, blowby past the rings, or a combination of those. A compression and leak down test will tell if the rings are a major contributor.
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tncean



Joined: 26 Feb 2005
Posts: 1652
Location: Chattanooga, Tn.

PostPosted: Tue Apr 21, 2009 2:37 am    Post subject: Reply with quote

For what it's worth, I did notice a decrease in "oil" film in the maf and air duct after a cyl head rebuild at 185k. The valve seals were redone.

t
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smithpatrick



Joined: 05 Nov 2007
Posts: 44
Location: Southern New Jersey

PostPosted: Fri May 15, 2009 7:34 pm    Post subject: Reply with quote

i did find a fault with the valve cover gasket, metal spacer was interfering with the cover seating properly, took the metal spacer out. tight cover gasket no leaks.
on my other 325i when i remove the oil filer cap the engine speed decreases, not with this new old 1990 325i manual trans. it seems there is an air leak.

all new rubber, good seal on valve cover, no responce from injectors when sprayed with ether, same for intake manifold.

no smoke, and it passed inspection. i will do a compression test.[img]
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5 e30's 84, 87, 3 90's
4 Boxer motorcycles R75/5, 2 R60/6, and a R90/6
1995 e36 320i auto euro specs from canada, 98 323i auto
2001 e46 325i manual
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tncean



Joined: 26 Feb 2005
Posts: 1652
Location: Chattanooga, Tn.

PostPosted: Sat May 16, 2009 12:16 am    Post subject: Reply with quote

Checked the hose from the valve cover that goes to the intake, as 325e suggested? Is gasket under oil add cover good? You might even try covering add oil cover area with a plastic bag on a gloved hand (engine running... heads up... messy) to see if change in performance... there should be, I would think. Or, make a temporary gasket for it.

Tried pulling out dipstick with engine running? There's an o ring on there, as well. If it's pulled with engine running, it should change performance.

Metal spacer? What is that about?

Does sound like an air leak.

t
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85-325e



Joined: 30 Jun 2002
Posts: 4711
Location: Southampton, NY

PostPosted: Sat May 16, 2009 3:07 am    Post subject: Reply with quote

t, you're so funny...

But you're right! What's that spacer thing you were talking about???
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smithpatrick



Joined: 05 Nov 2007
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Location: Southern New Jersey

PostPosted: Thu Jun 04, 2009 10:41 pm    Post subject: spacer thing Reply with quote

THE SPACER WAS UP FRONT NEAR THE CAM SHAFT SEALS, IN BETWEEN THE 2 ROCKER SHAFTS. iT SHOULD REST CLEANLY BETWEEN THE 2 SHAFTS IN THIS CASE IT HAD WORKED LOOSE AND WAS PREVENTING THE VLAVE COVER FROM CLOSING COMPLETELY. SO I TOOK IT OUT
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5 e30's 84, 87, 3 90's
4 Boxer motorcycles R75/5, 2 R60/6, and a R90/6
1995 e36 320i auto euro specs from canada, 98 323i auto
2001 e46 325i manual
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smithpatrick



Joined: 05 Nov 2007
Posts: 44
Location: Southern New Jersey

PostPosted: Thu Oct 15, 2009 9:23 pm    Post subject: 1990 325i idle control valve problem Reply with quote

the idle control valve is receiving differencial voltages with the throttle position switch closed, voltage on the one side is 9 to 10 volts the other is half that causing the crontrol valve to remain closed. creating enough back pressure to suck oil out of the engine case. Why does this happen?
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5 e30's 84, 87, 3 90's
4 Boxer motorcycles R75/5, 2 R60/6, and a R90/6
1995 e36 320i auto euro specs from canada, 98 323i auto
2001 e46 325i manual
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tncean



Joined: 26 Feb 2005
Posts: 1652
Location: Chattanooga, Tn.

PostPosted: Sat Oct 17, 2009 5:48 pm    Post subject: Reply with quote

Maybe a bad ICV??
t
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Pirate323i



Joined: 19 Aug 2004
Posts: 404
Location: Sydney, Australia

PostPosted: Sat Oct 17, 2009 9:45 pm    Post subject: Reply with quote

Hey Smithpatrick, that "spacer" actually stops the rocker shafts from rotating. it those shafts are allowed to rotate you will starve your rockers of oil and they will seize... Shocked
I would really suggest you go back and clean it all out and reseat that "spacer" tap it in with a hammer if need be, it sits on a taper from memory... but is VERY necessary.
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